Latest Articles from BioRisk Latest 100 Articles from BioRisk https://biorisk.pensoft.net/ Tue, 19 Mar 2024 06:40:12 +0200 Pensoft FeedCreator https://biorisk.pensoft.net/i/logo.jpg Latest Articles from BioRisk https://biorisk.pensoft.net/ Study of the dynamics of the microbial communities in the wedge clam Donax trunculus (Linnaeus, 1758) from the Bulgarian aquatory of the Black Sea https://biorisk.pensoft.net/article/111253/ BioRisk 21: 29-40

DOI: 10.3897/biorisk.21.111253

Authors: Sevginar F. Ibryamova, Stephany Toschkova, Darina Ch. Bachvarova, Elitca Stanachkova, Radoslav I. Ivanov, Nikolay D. Natchev, Tsveteslava V. Ignatova-Ivanova

Abstract: In the present work, we investigated the dynamics of the microbial communities in the wedge clam Donax trunculus (Linnaeus, 1758) from the Bulgarian coastal waters of the Black Sea. The samples were collected in the period of January 2020 until December 2022 from Arkutino, Ahtopol, Obzor and Tsarevo. The BIOLOG system was used for microbiological determination. In our investigation were isolated the following microorganisms: Enterococcus cancerogenus, Enterococcus hirae, Escherichia vulneris, Citrobacter farmeri, Acinetobacter gyllenbergii, Enterococcus hirae, Escherichia vulneris, Enterobacter cloacae, Escherichia hermannii, Pseudomonas mendocina, Pseudomonas fulva, Pseudomonas alcaligenes, Pseudomonas putida, Acinetobacter johnsonii, Acinetobacter gyllenbergii, Enterococcus hirae, Escherichia vulneris, Enterococcus gallinarum, Citrobacter sedakii, Pseudomonas putida, Streptococcus lugdunensis, Enterococcus casseliflavus, Vibrio cincinnatiensis, Vibrio alginolyticus, Vibrio parahaemolyticus, Enterococcus hirae, Streptococcus aureus, Staphylococcus lugdunensis and Enterococcus casseliflavus. During the winter period, we detected the presence of Pseudomonas sp. – P. alcaligenes, P. putida, and A. gyllenbergii. In the autumn months we isolated C. sedakii, C. farmeri, A. gyllenbergii, A. johnsonii, P. fulva and E. casseliflavus. In the spring, E. cancerogenus, E. hirae and Pseudomonas mendocina were found. During the summer, the highest biodiversity of microorganisms - E. hirae, E. vulneris, E. cloacae, E. gallinarum, P. putida, V. cincinnatiensis, V. alginolyticus, V. parahaemolyticus, S. aureus, E. hermannii and S. lugdunensis were registered. Although our three-year research showed that some species are permanent and others are transient, we tend to accept the conclusion that there is only a transient microbiota in mussels and it changes depending on environmental conditions or is a result of pollution of the Black Sea.

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Research Article Tue, 5 Dec 2023 10:48:42 +0200
Prospects and possibilities of using Raman spectroscopy for the identification of Pseudomonas aeruginosa from turtle Emys orbicularis (Linnaeus, 1758) skin https://biorisk.pensoft.net/article/111983/ BioRisk 21: 19-28

DOI: 10.3897/biorisk.21.111983

Authors: Aleksandrs Petjukevičs, Inta Umbraško, Natalja Škute

Abstract: This study describes an express method for identifying microorganisms: Pseudomonas aeruginosa by standard Raman spectroscopy, without surface-enhanced Raman spectroscopy (SERS). The short-wavelength 514 nm Ar-Ion laser was used for P. aeruginosa spectral identification in the Raman shift range from 3200 cm−1 to 200 cm−1. The research results showed a high analytical and diagnostic sensitivity of the technology to the express identification of P. aeruginosa and can be used as one of the reliable methods. The proven technology is promising for further research of other microorganisms due to several significant advantages of the method. It does not require long-term cultivation of bacteria and special sample preparation, additional expensive reagents or consumables.

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Research Article Fri, 17 Nov 2023 15:53:04 +0200
Biomonitoring with bryophytes in managed forested areas. Three examples from the southern Italian Apennines https://biorisk.pensoft.net/article/108551/ BioRisk 21: 11-18

DOI: 10.3897/biorisk.21.108551

Authors: Carmine Colacino

Abstract: Three sites in the southern Italian Apennines were selected to assess correlation between forest structure and bryophyte flora. In two of the sites, the Index of Air Purity (IAP)–based on cover data of epiphytic bryophytes–was evaluated. The results show that bryophyte populations–and consequently IAP–are affected by forest structure and development, and that studies including different sites require a precise assessment of silvicultural characteristics to allow comparisons. Indicator values of mosses and liverworts were also taken into consideration in characterizing ecologically the three sites.

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Short Communication Fri, 27 Oct 2023 17:24:38 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically simulated effects of the static magnetic field upon model complex lipids https://biorisk.pensoft.net/article/101171/ BioRisk 21: 1-10

DOI: 10.3897/biorisk.21.101171

Authors: Wojciech Ciesielski, Henryk Kołoczek, Zdzisław Oszczęda, Wiktor Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: Recognising effects of static magnetic field (SMF) of varying flux density on flora and fauna is attempted. For this purpose, the influence of static magnetic field is studied for molecules of five complex lipids i.e. such as β-carotene, sphingosine, ceramide, cholesterol and phosphatidylcholine. Methods: Computations of the effect of real SMF 0.0, 0.1, 1, 10 and 100 AMFU (Arbitrary Magnetic Field Unit; here 1AMFU > 1000 T) flux density were performed in silico (computer vacuum), involving advanced computational methods. Results: SMF polarises molecules depending on applied flux density. Only β-carotene survives exposure to SMF of 10 and 100 AMFU without radical splitting of some valence bonds. Molecules of remaining lipids suffered radical cleavage of some bonds on exposure to SMF of 10 and 100 AMFU. Manipulation with applied flux density provides either inhibition or stimulation of biological functions of the lipids under study. Conclusions: SMF destabilises complex lipids to the extent depending applied flux density. Biological functions of β-carotene are fairly sensitive to SMF, whereas only slight response to the effect of SMF is observed in case of sphingosine, ceramide and cholesterol. Enzymatic hydrolysis of phosphatidylcholine is stimulated by SMF regardless of the catalysed enzyme employed.

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Research Article Fri, 15 Sep 2023 13:55:08 +0300
Forest habitats of Godech Municipality, Western Bulgaria https://biorisk.pensoft.net/article/97534/ BioRisk 20: 153-163

DOI: 10.3897/biorisk.20.97534

Authors: Borislav Grigorov, Nikolay Velev, Assen Assenov, Momchil Nazarov, Beloslava Genova, Kiril Vassilev

Abstract: The current study aims at revealing the forest habitat diversity of Godech Municipality, according to the EUNIS habitat classification. Initial data was collected from the Ministry of Environment and Water and the Forestry Management Plans. Subsequently, 418 vegetation plots (relevés) and 3422 verification points were collected during the fieldwork seasons of 2019 and 2020. The research territory is situated in Western Bulgaria in close proximity to the country’s border with the Republic of Serbia. Forests cover a total of 144.85 km2. Their phytocoenoses are dominated by Fagus sylvatica L. (59.22 km2), Quercus cerris L. (14.85 km2), Carpinus betulus L. (4.94 km2), Quercus dalechampii Ten. (2.39 km2), Q. frainetto Ten. (2.99 km2). There are plantations with Pinus nigra J. F. Arnold (20.87 km2), P. sylvestris L. (16.06 km2) and Picea abies H. Karst (11.65 km2) also. Forests are experiencing some major threats, such as logging, pollution and fires.

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Research Article Mon, 15 May 2023 20:00:12 +0300
The use of boreal relict shrub habitats of willow-leaf meadow sweet (Spiraea salicifolia) and shrubby cinquefoil (Potentilla fruticosa) in Western Rhodope Mts. by mammal species https://biorisk.pensoft.net/article/97604/ BioRisk 20: 139-152

DOI: 10.3897/biorisk.20.97604

Authors: Venislava Spasova, Daniela Simeonovska-Nikolova, Krastio Dimitrov, Gabriela Petrova, Kalina Pachedjieva, Rossen Tzonev

Abstract: Plant communities of two peat-shrub species – Spiraea salicifolia and Potentilla fruticosa were studied in the Rhodope Mts., with emphasis on their use as a resource for the mammals associated with them. These shrubs are boreal relicts among the dominant coniferous forests. The field surveys were conducted in the spring-autumn period of 2021–2022. In both study areas, the species composition of the mammals was studied by camera traps for medium and large mammals, and by Sherman live traps for small mammals. The species registered were roe deer (Capreolus capreolus), red fox (Vulpes vulpes), wild boar (Sus scrofa), pine marten (Martes martes), European hare (Lepus europaeus), red squirrel (Sciurus vulgaris), bank vole (Myodes glareolus) and yellow-necked mouse (Apodemus flavicollis). Having in mind that small mammals are vital prey base for avian and mammalian predators, it is not surprising that M. glareolus and A. flavicollis individuals were captured in the habitats that they probably use as shelters. The pine marten inhabits the forests by which the community of P. fruticosa is surrounded, but probably feeds on the rodents in the shrub. In this way, it probably provides it with an alternative to the forest food base and hunting ground. From the presented results, it seems that the L. europaeus uses P. fruticosa shrubs as food. Therefore, the plant communities of the two relict peat-shrub species studied probably provide shelter and food for the mammals. Their importance is established for at least one species of mammal with conservation significance at national and European level – M. martes. Therefore, it is necessary to continue and expand the future monitoring on mammal diversity of these relict communities.

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Research Article Mon, 15 May 2023 20:00:11 +0300
Comparative study of metal concentration determination in albumen of hen eggs originating from industrial poultry farms, backyard and free-range hens using ICP-OES technique https://biorisk.pensoft.net/article/97322/ BioRisk 20: 129-138

DOI: 10.3897/biorisk.20.97322

Authors: Plamen M. Kirov, Metody Karadjov, Hristo K. Hristov, Radostina Alexandrova

Abstract: There have been multiple types of research focusing on the relationship between feed ingredients and metal content in the egg white due to their role in human nutrition. The aim of the present study is to determine the metal concentration in hens’ eggs and, in particular, to compare the metal concentration in egg albumen originating from industrial poultry farms with that of backyard and free-range hens. All samples were collected in Romania from five separate counties and 10 different farms, over a period of two weeks and, as a result, a total of 50 were collected, 10 from each housing system (batteries/cages, litter/soil, free-range, organic and backyard). The measurements of the metals were taken by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), with a wide range of elements reported. For the essential elements, we measured Cr, Cu, Fe, Mn and Zn; Al, Cd, Ni and Pb for the heavy metals and, in addition, we measured B, Ba, Sr, Ca and Mg. The present study revealed that the metals in eggs from free-range hens are richer in essential elements with mean concentrations as follows: 1.528 mg/kg for Fe, 3.278 mg/kg for Zn, 0.058 mg/kg for Mn and 1.362 mg/kg for Cu. We concluded that the egg quality is closely connected with the housing system and nutrition. Furthermore, the results demonstrate that eggs from backyard housing are no better than those from free-range hens in terms of essential metal composition. The heavy and non-essential metal contents, present in the albumen of all the examined eggs, were much lower than the maximum allowed concentration and, therefore, egg consumption does not pose any risk to human health.

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Research Article Mon, 15 May 2023 20:00:10 +0300
Study of the plant growth-promoting capacity of Pseudomonas putida 1046 in a model plant system https://biorisk.pensoft.net/article/97581/ BioRisk 20: 115-128

DOI: 10.3897/biorisk.20.97581

Authors: Gloria Georgieva, Trayana Nedeva, Marina Badalova, Veronika Deleva, Valentin Savov

Abstract: Plant Growth Promoting Rhizobacteria (PGPR) represent a microbial community that exerts growth-promoting capabilities in plants by various mechanisms. Among the PGPR genera, Pseudomonas spp. deserves special attention. It is due to its characteristic traits, like the production of phytohormones and siderophores, solubilization of minerals and phosphates, and plant protection from biotic and abiotic stress. These PGPR properties depend on the microorganism and its plant counterpart. The use of microbial strains as bioinoculants must consider the physiological and economic aspects of the process, and the plant growth stimulating effect has to be checked and proved. This study aimed to explore the PGP capacity of Pseudomonas putida 1046 strain in a model plant system of the economically important corn culture (Zea mays). The effect of the strain’s metabolic status on the plant germination capacity was evaluated. Bacterial cultures, grown 16 h and 48 h, were explored for the treatment of the corn seeds at three experimental concentrations: 0.1, 0.2, and 0.4%, and monitoring of their germination capacity through the growth indicators length of the radicle, length of the coleoptile, and the number of lateral roots. The data obtained outline the positive effect of Pseudomonas putida 1046 on the germination capacity of corn when applied at 0.2% concentration. The in vitro treatment of the model plants with 0.2% suspension resulted in a 22.87%–28.33% increase in the length of the radicle, a 35.96%–49.56% increase in the length of the coleoptile, and a 5.41–16.67% increase in the number of the lateral roots. High values of the vigour index (2125 for 16 h and 2721 for 48 h culture) were also registered. The strain’s ability to produce siderophores of hydroximate type and exhibit phosphate solubilizing activity is proved. The optimal treatment parameters of the corn seeds comprise the application of 0.2% suspension of 16 h grown Pseudomonas putida 1046 strain for five days.

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Research Article Mon, 15 May 2023 20:00:09 +0300
In vitro clonal propagation of Tanacetum cinerariifolium and establishment of an ex situ collection of selected clones https://biorisk.pensoft.net/article/97566/ BioRisk 20: 97-114

DOI: 10.3897/biorisk.20.97566

Authors: Vladimir Ilinkin, Boryanka Traykova, Marina Stanilova

Abstract: Dalmatian pyrethrum Tanacetum cinerariifolium (Trevir.) Sch. Bip. (Asteraceae) is a perennial herb endemic to the eastern coast of the Adriatic Sea. The species is widely cultivated in many countries for its bioactive compounds pyrethrins, which are used as natural insecticides. Plants derived from seeds vary greatly in pyrethrin content; therefore, the vegetative propagation of high-quality individuals is very important for the establishment of agricultural pyrethrum crops. The present study deals with rapid in vitro multiplication of pyrethrum, ex vitro adaptation of selected clones and creation of an ex situ collection, as a first step towards introducing the species into agriculture in Bulgaria. Seeds from a private ex situ collection in Bulgaria and from a natural Croatian population were used as initial material for in vitro cultures initiation. Basal MS medium (Murashige and Skoog 1962) or MS supplemented with different concentrations of kinetin and indole-3-butyric acid were used for seed germination and multiplication of one-seed derived clones by consecutive subcultivations. The propagation effectiveness was evaluated as a number of new plants obtained per initial shoot. Considerable losses were noticed due to both endophytic contaminations and necrosis, especially on media supplemented with plant growth regulators. These problems were overcome by medium optimization: adding an antibiotic and modifying the medium to increase the calcium concentration using CaCO3. In the best medium variant (basal MS + 200 mg/L Medaxone + 75 mg/L Ca) no more infected plants were observed, and the percentage of necrotic plants decreased threefold, which resulted in formation of 38.06±10.11 new plants per initial shoot for a period of 7 months. Three hundred and sixty plants were ex vitro adapted in a phytotron (88% surviving rate), then 16 plants from 4 selected clones were transferred to the ex situ collection and bloomed twice from the very first growing season (June and September). The number of the flower heads increased in the second year of field cultivation and an average of 328±138 capitula per plant were counted for the best clone. The first trials to establish a pilot plantation of pyrethrum are promising.

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Research Article Mon, 15 May 2023 20:00:08 +0300
Alterations in membrane stability after in vitro exposure of human erythrocytes to 2.41 GHz electromagnetic field https://biorisk.pensoft.net/article/97616/ BioRisk 20: 83-96

DOI: 10.3897/biorisk.20.97616

Authors: Boyana Angelova, Gabriela Atanasova, Nikolay Atanasov, Momchil Paunov, Maria Gurmanova, Margarita Kouzmanova

Abstract: The growing use of wireless communication devices has been significantly increasing the level of high frequency electromagnetic fields (EMFs) in the environment, which raises a concern for possible deleterious effects on living organisms. Long lasting exposure to low-intensity EMFs can cause effects on the molecular and cellular level, and a number of morphological and physiological changes. The aim of this work was to investigate the effects of 2.41 GHz EMF emitted by wireless communication systems on human erythrocytes after in vitro irradiation. The amount of the hemoglobin released from the cells was measured as an indicator for membrane destabilization. Effects of different exposure times (20 min or 4 h) and time elapsed after exposure to 2.41 GHz pulsed or continuous EMFs with different intensities, emitted from a textile (0.213–0.238 V/m) or a dipole (5, 20, 40 and 180 V/m) antenna, were investigated. The obtained results showed that the low intensity EMF had no significant effect on the hemoglobin release from irradiated cells; even a slight tendency for membrane stabilization was noticed 3–4 hours after the end of 20-min exposure to 0.213–0.238 V/m, 2.41 GHz EMF. There was no difference in the effects of continuous and pulsed EMFs. Increased hemoglobin release was observed only during the 4-hour exposure to 180 V/m, 2.41 GHz continuous EMF. Under these conditions, the temperature of the cell suspension had been rising, so we compared the results obtained under EMF with the effects of conventional heating. Moreover, after 1-hour exposure to 180 V/m the released hemoglobin level was a bit higher than the control one but the difference disappears within an hour after terminating the irradiation. In conclusion, the in vitro exposure to 2.41 GHz EMF emitted by wireless communication devices with power density below the reference level for population exposure does not change the stability of the cell membrane of human erythrocytes.

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Research Article Mon, 15 May 2023 20:00:07 +0300
Occurrence of marine biotoxins on Bulgarian Black Sea coastal waters in 2021 https://biorisk.pensoft.net/article/97557/ BioRisk 20: 71-81

DOI: 10.3897/biorisk.20.97557

Authors: Zlatina V. Peteva, Stanislava K. Georgieva, Bernd Knock, Thomas Max, Mona D. Stancheva, Simona Valkova

Abstract: Marine biotoxins are produced by certain phytoplankton species and used to accumulate in filter-feeding marine organisms. The occurrence of marine biotoxins in all aquatic environments and latitudes is variable in time and space. Thus, it is an essentially natural phenomenon, but the occurrence of toxigenic phytoplankton cannot be completely avoided or eliminated. A serious concern appears if these substances accumulate at high levels in seafood. If it is consumed by mammals including humans, severe illness of consumers of intoxicated seafood may result. The aim of this study is to assess the presence of marine biotoxins in plankton samples taken in 2021 and to compare the determined levels with a previous period. Plankton samples (n = 21) were collected in 2021 along the whole Bulgarian coastline (Black Sea). The presence of hydrophilic (domoic acid (DA)) and lipophilic toxins (okadaic acid, dinophysis toxin – 1, dinophysis toxin -2, azaspiracid-1, goniodomin A, pectenotoxin-2 (PTX2), yessotoxin, spirolide-1 and gymnodimine A) was investigated via liquid chromatography – tandem mass spectrometry (LC-MS/MS). Results indicated the presence of only DA in three samples and PTX2 in two samples. The positive samples were sporadically distributed throughout the study period. During 2016–2019, LC-MS/MS analysis confirmed the presence of DA, PTX2, YTX, SPX-1 and GDA in plankton net samples collected from the same locations reported here. The matching toxins (DA and PTX2) were at comparable levels in both periods of investigation, thus lower than in other European waters where harmful algal blooms are registered. These results show the persistent appearance of some marine biotoxins in Bulgarian waters. Although levels were low in the monitored periods, a constant monitoring is required in order that toxic events by seafood consumption be avoided.

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Research Article Mon, 15 May 2023 20:00:06 +0300
Evaluation of abundance of microplastics in the Bulgarian coastal waters https://biorisk.pensoft.net/article/97555/ BioRisk 20: 59-69

DOI: 10.3897/biorisk.20.97555

Authors: Stanislava K. Georgieva, Zlatina V. Peteva, Mona D. Stancheva

Abstract: Plastic pollution in seawaters is ubiquitous, but quantitative estimates on the floating microplastics in the Black Sea are still limited. Plastics may adsorb persistent environmental contaminants, thus representing a potential risk for marine organisms. Aim: Thе aim of the study was evaluation of the presence and characteristics of microplastic particles (MPs) in waters from the Black Sea coast of Bulgaria. Materials and methods: Samples of coastal waters were collected from March 2021 to April 2022 from different stations on the Black Sea coast, including protected, aquaculture and industrial areas. In order to determine the number of plastic particles, 23 samples were collected from the surface waters at depth of 1–3 m close to the Bulgarian shore. Samples were treated with H2O2, plastic particles were isolated by density separation and filtered over a membrane filter. Identification analysis of micro particles (< 5 mm) was performed visually by microscopy. Main results: Results indicated widespread presence of microplastics in coastal waters. Mean MPs concentration was calculated 7.3 ± 4.9 pt/l. The comparison of the North, Varna and South sampling area showed that there is no significant difference in the abundance of plastic particles. The most dominant type forms were fibres followed by fragments. The most abundant size class of fragments was 101–500 μm Ferret diameter. Conclusion: Further studies are needed in order to fill knowledge gap and to evaluate distribution of plastic particles in the Black Sea and their potential ecological risk.

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Research Article Mon, 15 May 2023 20:00:05 +0300
Genotype differences towards lead chloride harmful action https://biorisk.pensoft.net/article/97598/ BioRisk 20: 37-57

DOI: 10.3897/biorisk.20.97598

Authors: Teodora Ivanova Todorova, Petya Nikolaeva Parvanova, Krassimir Plamenov Boyadzhiev, Martin Dimitrov Dimitrov, Stephka Georgieva Chankova

Abstract: The aim of the study was to throw more light on the PbCl2 mode of action (MoA) depending on the genotype by the application of three model organisms and microbiological, biochemical, and molecular approaches. Three model systems – Chlamydomonas reinhardtii strain 137C – wild type (WT), Saccharomyces cerevisiae strain D7ts1, and Pisum sativum L. cultivar Ran1 and two experimental schemes – short- and long-term treatments were used. C. reinhardtii and S. cerevisiae cell suspensions (1×106 cells/ml) at the end of the exponential and the beginning of a stationary phase of growth were treated with various PbCl2 concentrations (0.45–3.6 mM) for 2 hours. Lower PbCl2 concentrations (0.03–0.22 mM) were also tested on C. reinhardtii 137C. Short-term treatment for up to 2 days with PbCl2 concentrations in the range of 0.45–3.6 mM and long-term treatment for up to 10 days with concentrations in the range of 0.45–2.7 mM was performed on P. sativum L. seeds and plants, respectively. Long-term treatment with a PbCl2 concentration of 3.6 mM was not tested because of the very strong toxic effect (plant death). The following endpoints were used – for C. reinhardtii: cell survival, “visible” mutations, DNA double-strand breaks (DSBs), malondialdehyde (MDA), intracellular peroxides (H2O2), and photosynthetic pigments; for S. cerevisiae – cell survival, gene conversion, reverse mutation, mitotic crossing-over, DSBs, superoxide anions, MDA and glutathione (GSH); P. sativum L. – germination and root length (short-term treatment), pro-oxidative markers – MDA, H2O2 and photosynthetic pigments (long-term treatment). Genotype differences between C. reinhardtii (0.047 mM) and S. cerevisiae (1.66 mM) were observed by two endpoints: concentrations inducing 50% lethality (LD50) and DSB induction. By contrast, no mutagenic effect was found for both unicellular test models. A slight toxic capacity of PbCl2, measured as inhibition of Pisum sativum L. seed germination and around 20% root length reduction was revealed after the treatment with concentrations equal to or higher than 1.8 mM. The variety of stress responses between the two plant test models was demonstrated by comparing MDA and H2O2. A dose-dependent increase in H2O2 levels and a minor increase of MDA levels (around 9–15%) were measured when C. reinhardtii cells were treated with concentrations in the range of LD20–LD80 (0.03–0.11 mM). Analyzing the kinetics of MDA and H2O2 in pea leaves, the most pronounced effect of concentration was shown for 2.7 mM. A decrease in the photosynthetic pigments was detected in the two experimental designs – short-term on C. reinhardtii and long-term on P. sativum treatments. The pro-oxidative potential was also proven in S. cerevisiae based on increased levels of MDA and superoxide anions and decreased GSH. New information is gained that PbCl2 can affect the DNA molecule and photosynthetic pigments via induction of oxidative stress. Our study revealed that the magnitude of stress response towards PbCl2 is genotype-specific. Our finding that Chlamydomonas reinhardtii is a sensitive test system towards PbCl2 contributes to good strategies for revealing very low levels of contaminants present chronically in main environmental matrices. This is the first report, as far as we know, affirming that PbCl2 can induce DSBs in Chlamydomonas reinhardtii and Saccharomyces cerevisiae.

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Research Article Mon, 15 May 2023 20:00:04 +0300
Distribution of microbial abundance in long-term copper contaminated soils from Topolnitsa-Pirdop valley, Southern Bulgaria https://biorisk.pensoft.net/article/97795/ BioRisk 20: 23-35

DOI: 10.3897/biorisk.20.97795

Authors: Michaella Petkova, Nadezhda Nankova, Viktoriya Kancheva, Silvena Boteva, Anelia Kenarova, Galina Radeva

Abstract: This study presents the distribution of bacterial and fungal abundances in long-term copper (Cu) contaminated soils in Topolnitsa-Pirdop valley – a highly industrialized zone with a number of mines and processing plants for copper and other non-ferrous metals. The bacterial (16S rRNA gene copies) and fungal (ITS rRNA gene copies) were estimated using quantitative PCR technique in five topsoils, differently Cu contaminated (ranging from 28.05 to 198.9 mg kg-1). Bacterial abundance varied in a range of 1.68 × 1011 to 3.24 × 101116S rRNA genes, whereas fungi amounted from 1.95 × 108 to 6.71 × 108 ITS rRNA genes. Fungal and bacterial abundances were significantly (fungi) and insignificantly (bacteria) influenced by Cu contamination. The fungal/bacterial ratio related negatively with soil Cu, which shifted microbial communities’ structure towards bacterial dominance. Since the ratio between bacteria and fungi are vital in explaining many soil functions, the calculated changes in this ratio indicated deterioration in soil quality, being of primary importance for plant production.

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Research Article Mon, 15 May 2023 20:00:03 +0300
Does overproduction of chaperone proteins favour the repair of DNA injuries induced by oxidative stress? (Mini review) https://biorisk.pensoft.net/article/97569/ BioRisk 20: 7-22

DOI: 10.3897/biorisk.20.97569

Authors: Stephka G. Chankova, Nadezhda P. Yurina, Teodora I. Todorova, Petya N. Parvanova

Abstract: Genotype resistance to oxidative stress, induced by various physical/chemical stimuli has been the focus of scientists for the last decades, with several aspects – ecological (the formation of the genetic elite of population), agricultural and medical (radio-chemotherapy). Genotype resistance to oxidative stress is regarded as the integration of different morphological, physiological, biochemical, metabolic and genetic characteristics. Currently, it is supposed that the mechanisms involved in the formation of genotype resistance to oxidative stress are inter-correlated and inter-dependent, comprising changes in genes, proteins, enzymes, different metabolic pathways and/or biological networks. According to the present state of knowledge, various cellular targets, resulting in genotoxic stress, induction of DNA damage, mutations, genomic instability or apoptosis can trigger different signal transduction pathways, activating DNA repair, antioxidant and chaperone defence systems. Till now, a lot of experimental data have been accumulated concerning the contribution of DNA repair to the formation of genotype resistance to oxidative stress. At the same time, genotype resistance of organisms is largely determined by the ability of molecular chaperones to maintain conformational homeostasis of proteins (folding – misfolding – refolding or aggregation – degradation). The role of chaperones in protein homeostasis and cell death, especially in apoptosis, is well discussed in literature, but much less is known about their function in DNA repair. In this regard, here we addressed the question of whether the overproduction of chaperone proteins contributes to the repair of DNA damage caused by oxidative stress.

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Review Article Mon, 15 May 2023 20:00:02 +0300
International Seminar of Ecology – 2022 https://biorisk.pensoft.net/article/104660/ BioRisk 20: 1-5

DOI: 10.3897/biorisk.20.104660

Authors: Kalina Danova

Abstract:

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Editorial Mon, 15 May 2023 20:00:01 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically simulated effects of the static magnetic field upon fatty acids and their glycerides https://biorisk.pensoft.net/article/96250/ BioRisk 19: 1-24

DOI: 10.3897/biorisk.19.96250

Authors: Wojciech Ciesielski, Henryk Kołoczek, Zdzisław Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: We attempt to recognise the effects of static magnetic field (SMF) of varying flux density on flora and fauna. For this purpose, the influence of static magnetic field is studied for molecules of octadecanoic (stearic), cis-octadec-9-enoic (oleic), cis,cis-octadec-9,12-dienoic (linoleic), all cis-octadec-6,9.12-trienoic (linolenic), trans-octadec-9-enoic – (elaidic), cis-octadec-11-enoic (vaccenic) and all trans-octadec-6,9,12-trienoic (trans-linolenic) acids as well as 1- and 2-caproyl monoglycerides, 1,2- and 1,3-caproyl diglycerides and 1,2,3-caproyl triglyceride. In such a manner we attempt to develop an understanding of the interactions of living cells with SMF on a molecular level. Methods: Computations of the effect of real SMF 0.0, 0.1, 1, 10 and 100 AMFU (Arbitrary Magnetic Field Unit; here 1AMFU > 1000 T) flux density were performed in silico (computer vacuum), involving advanced computational methods. Results: SMF polarises molecules depending on applied flux density It neither ionises nor breaks valence bonds at 0.1 and 1 AMFU. In some molecules under consideration flux density of 10 and 100AMFU some C-H and C-C bonds were broken. Some irregularities were observed in the changes of positive and negative charge densities and bond lengths against increasing flux density. They provide evidence that molecules slightly change their initially fixed positions with respect to the force lines of the magnetic field. The length of some bonds and bond angles change with an increase in the applied flux density providing, in some cases, polar interactions between atoms through space. Conclusions: SMF destabilizes lipid acids and caproyl glycerides irregularly against increasing flux density. That irregularity results from the ability of those molecules to twist out of the initially established SMF plain and squeeze molecules around some bonds. In some molecules SMF flux density of 10 AMFU and above breaks some valence bonds and only in case of elaidic acid the trans-cis conversion is observed. Depending on the structure and applied flux density SMF either stimulates or inhibits metabolic processes of the lipids under study.

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Research Article Mon, 6 Mar 2023 17:29:21 +0200
The first evidence of microplastics in plant-formed fresh-water micro-ecosystems: Dipsacus teasel phytotelmata in Slovakia contaminated with MPs https://biorisk.pensoft.net/article/87433/ BioRisk 18: 133-143

DOI: 10.3897/biorisk.18.87433

Authors: Katarína Fogašová, Peter Manko, Jozef Oboňa

Abstract: Tiny pieces of plastic, or microplastics, are one of the emerging pollutants in a wide range of different ecosystems. However, they have, thus far, not been confirmed from phytotelmata – specific small water-filled cavities provided by terrestrial plants. The authors confirmed microplastics (141 μm – 2.4 mm long fibres of several colour and blue and orange fragments with diameters of 9–81 μm) in quantities from 101 to 409 per ml in Dipsacus telmata from two different periods. The phytotelmata, therefore, appear to be possible indicators of current and future microplastic pollution of the environment. However, further research is needed to obtain accurate information and verify the methodology for possible assessment of the local environmental burden of microplastics.

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Short Communication Tue, 30 Aug 2022 09:38:17 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically simulated effects of the static magnetic field upon metalloporphyrines https://biorisk.pensoft.net/article/86616/ BioRisk 18: 115-132

DOI: 10.3897/biorisk.18.86616

Authors: Wojciech Ciesielski, Tomasz Girek, Zdzisław Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: An attempt to recognize the effects of a static magnetic field (SMF) of varying flux density on flora and fauna.. For this purpose the influence of static magnetic field upon molecules of Mg(II), Fe(II), Fe(III), Co(II), Co(III) and Cu(II) metalloporphyrins is studied. Methods: Computations of the effect of real SMF 0.0, 0.1, 1, 10 and 100 AFU (Arbitrary Magnetic Field Unit; here 1AMFU > 1000 T) flux density were performed in silico (computer vacuum) involving advanced computational methods. Results: The static magnetic field (SMF) decreased the stability of the metalloporphyrine molecules. This effect depended on the situation of the molecule in respect to the direction of the SMF of the Cartesian system. An increase in the value of heat of formation was accompanied by an increase in the dipole moment. It was an effect of deformations of the molecule which involved pyrrole rings holding the hydrogen atoms at the ring nitrogen atoms and the length of the C-H and N-H bonds. As a consequence, that macrocyclic ring lost its planarity. Conclusions: SMF even of the lowest, 0.1 AMFU flux density influences the biological role of metalloporphyrines associated with their central metal atoms. This effect is generated by changes in the electron density at these atoms, its steric hindering and polarization of particular bonds from pure valence bonds possibly into ionic bonds.

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Research Article Tue, 23 Aug 2022 14:07:13 +0300
A study of the microbiology of the intestinal tract in different species of Teleost fish from the Black Sea https://biorisk.pensoft.net/article/80357/ BioRisk 18: 105-113

DOI: 10.3897/biorisk.18.80357

Authors: Sevginar Ibryamova, Stephany Toschkova, Borislava Pavlova, Elitca Stanachkova, Radoslav Ivanov, Nikolay Natchev, Nesho Chipev, Tsveteslava Ignatova-Ivanova

Abstract: This paper presents a study on the microbial status of different fish species and their habitats in the Bulgarian Black Sea area. The samples were collected in the period of January 2021 until March 2021. The fish species we used in this study were Black Sea turbot (Scophthalmus maximus), round goby (Neogobius melanostomus), shore rockling (Gaidropsarus mediterraneus) and European anchovy (Engraulis encrasicolus). The BIOLOG system was used for microbiological determination. From the different fish species, different species of microorganisms were isolated (using selective nutrient media). From the torbut, we isolated species Enterococcus villorum with 24 × 103 cells in 1 ml, Moraxella nonliquefaciens with 70 × 103 cells in 1 ml and Pseudomonas synxantha with 123 × 103 cells. Pseudomonas putida was isolated from the round goby with 20 × 103 cells in 1 ml. The species Streptococcus entericus with 123 × 103 cells in 1 ml was isolated from the shore rockling. Pseudomonas fulva with 60 × 103 cells in 1 ml was isolated from the European anchovy. A total of 223 × 103 cells in 1 ml of Pseudomonas agarici were isolated from Trachinus draco. Pseudomonas tolaasii with 145 × 103 cells in 1 ml were isolated from Merlangius merlangus. A different species of bacteria of the genus Pseudomonas was found for each of the investigated species of Black Sea fish. Apparently, the species Pseudomonas is characteristic of marine Teleostei and is important for the life and metabolism of these vertebrates. These microorganisms probably are resident species and developed not as result of pollution or environmental change.

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Data Paper Thu, 4 Aug 2022 11:55:28 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically simulated effects of the static magnetic field upon porphine https://biorisk.pensoft.net/article/80607/ BioRisk 18: 93-104

DOI: 10.3897/biorisk.18.80607

Authors: Wojciech Ciesielski, Tomasz Girek, Zdzisław Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: Recognizing effects of static magnetic field (SMF) of varying flux density on flora and fauna is attempted. For this purpose the influence of SMF upon the porphine molecule is studied. Methods: Computations of the effect of static magnetic field (SMF) of 0.0, 0.1, 1, 10 and 100 AFU (1 AFU > 1000 T) flux density were performed in silico for SMF changes distribution of the electron density in that molecule. HyperChem 8.0 software was used together with the AM1 method for optimization of the conformation of the molecule of porphine. The computations of polarizability, charge distribution, potential and dipole moment for molecules placed in SMF were performed for molecule situated subsequently in the x-y, y-z and x-z planes of the Cartesian system. The computations involved the DFT 3-21G method. Results: Static magnetic field (SMF) decreased stability of the porphine molecule. This effect depended on the situating the molecule in respect to the direction of SMF of the Cartesian system. An increase in the value of heat of formation was accompanied by an increase in dipole moment. Conclusions: Observed effects resulted from deformations of the molecule which involved pyrrole rings holding the hydrogen atoms at the ring nitrogen atoms and the length of the C–H and N–H bonds. In a consequence that macrocyclic ring lost its planarity.

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Research Article Thu, 30 Jun 2022 23:56:05 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically simulated effects of the static magnetic field upon simple alkanols https://biorisk.pensoft.net/article/76997/ BioRisk 18: 35-55

DOI: 10.3897/biorisk.18.76997

Authors: Wojciech Ciesielski, Tomasz Girek, Zdzisław Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: Recognising effects of static magnetic field (SMF) of varying flux density on flora and fauna is attempted. For this purpose, the influence of static magnetic field upon molecules of lower alkanols i.e. methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol, S-butan-2-ol, isobutanol and tert-butanol is studied. Methods: Computations of the effect of real SMF 0.0, 0.1, 1, 10 and 100 AFU (Arbitrary Field Unit; here 1AFU > 1000 T) flux density were performed in silico (computer vacuum), involving advanced computational methods. Results: SMF polarises molecules depending on applied flux density, but it neither ionises nor breaks valence bonds. Some irregularities in the changes of positive and negative charge densities and bond lengths provide evidence that molecules slightly change their initially fixed positions with respect to the force lines of the magnetic field. Length of some bonds and bond angles change with an increase in the applied flux density, providing, in some cases, polar interactions between atoms through space. Conclusions: Since SMF produced and increase in the negative charge density at the oxygen atom of the hydroxyl group and elongated the –O-H bond length, these results show that SMF facilitates metabolism of the alkanols.

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Research Article Mon, 6 Jun 2022 14:23:41 +0300
Potential risk resulting from the influence of static magnetic field upon living organisms. Numerically-simulated effects of the static magnetic field upon carbohydrates https://biorisk.pensoft.net/article/77001/ BioRisk 18: 57-91

DOI: 10.3897/biorisk.18.77001

Authors: Wojciech Ciesielski, Tomasz Girek, Henryk Kołoczek, Zdzisław Oszczęda, Jacek A. Soroka, Piotr Tomasik

Abstract: Background: Recognising effects of static magnetic field (SMF) of varying flux density on flora and fauna is attempted. For this purpose, the influence of SMF upon molecules of α- and β-D-glucose, α- and β-D-galactose, α- and β-fructopyranoses, α- and β-fructofuranoses and α- and β-D-xylofuranoses and α and β-D-xylopyranoses is studied. Methods: Computations of the effect of static magnetic field (SMF) of 0.0, 0.1, 1, 10 and 100 AFU (1 AFU > 1000 T) flux density were performed in silico for SMF changes distribution of the electron density in these molecules. Hyper-Chem 8.0 software was used together with the AM1 method for optimisation of the conformation of the molecules of monosaccharides under study. Then polarisability, charge distribution, potential and dipole moment for molecules placed in SMF were calculated involving DFT 3-21G method. Results: Application of SMF induced polarisability of electrons, atoms and dipoles, the latter resulting in eventual re-orientation of the molecules along the applied field of the molecules and the electron density redistribution at particular atoms. Increase in the field strength generated mostly irregular changes of the electron densities at particular atoms of the molecules as well as polarisabilities. Energy of these molecules and their dipole moments also varied with the SMF flux density applied. Conclusions: Saccharides present in the living organisms may participate in the response of the living organisms to SMF affecting metabolism of the molecules in the body fluids by fitting molecules to the enzymes. Structural changes of saccharide components of the cell membranes can influence the membrane permeability.

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Research Article Mon, 6 Jun 2022 14:23:21 +0300
Studies on the Bulgarian members of the family Chenopodiaceae s. stricto: a review https://biorisk.pensoft.net/article/78548/ BioRisk 18: 17-34

DOI: 10.3897/biorisk.18.78548

Authors: Vanya Stoyanova Boneva, Nadezhda Traycheva Petkova

Abstract: The Bulgarian members of Chenopodiaceae are mainly ruderal and weed species; another part are halophytes. Over the last two decades, phylogenetic molecular studies have led to a number of taxonomic changes in the above mentioned family. Changes have also occurred in one of the largest genera – Chenopodium. The aim of the present study is to review the research on Bulgarian members of the Chenopodiaceae family. The data available in the literature on the taxonomic composition, chorology, morphological features and karyological variability of the species from their Bulgarian populations has been studied. A review of the phytochemical studies of Chenopodiaceae plants from their Bulgarian populations has been made. The systematized data is presented in chronological order, which allows for tracing the current level of study on the family in Bulgaria and opportunities for new research.

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Review Article Wed, 27 Apr 2022 11:25:04 +0300
Relocation and formation of new local population of Viola pumila Chaix – an endangered species in Europe and identification of measures for improvement of its habitat https://biorisk.pensoft.net/article/76114/ BioRisk 18: 1-16

DOI: 10.3897/biorisk.18.76114

Authors: Maria Zh. Kaschieva, Nikolay P. Nedyalkov

Abstract: The meadow violet (Viola pumila Chaix) is an endangered species which is regionally extinct in many European countries. This is a stenobiontic species with a very limited distribution in Bulgaria. Only a few populations have been detected, and they consist of several tens to several hundreds of specimens. The meadow violet has limited reproductive abilities and weak competitiveness. The species is exposed to various anthropogenic threats, as the most significant of them are related to ploughing, conversion of the mesophilic meadows into arable lands, changes in the water regime of the habitats, the expansion of highly competitive species from the group of tufted cereal grasses and infrastructure construction. To date, information concerning the relocation of rare and endangered plant species in Bulgaria is rather scarce. In the present study we provide a protocol on our activities during a successful establishment of a new locality as part of our effort to successfully relocate one particular population of the meadow violet. The observations made after the relocation of the species over a two-year period (2020 and 2021) provided data on the successful relocation, and the creation of a new locality for the species. We discuss the conservation measures needed for this rare and endangered species, and efforts to increase its population, as well as the measures needed for effective management of the habitats of V. pumila (mainly 6510 “Lowland hay meadows”).

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Research Article Wed, 27 Apr 2022 11:24:36 +0300
Development of accurate chemical thermodynamic database for geochemical storage of nuclear waste. Part III: Models for predicting solution properties and solid-liquid equilibrium in cesium binary and mixed systems https://biorisk.pensoft.net/article/77523/ BioRisk 17: 407-422

DOI: 10.3897/biorisk.17.77523

Authors: Tsvetan Tsenov, Stanislav Donchev, Christomir Christov

Abstract: The models described in this study are of high importance in the development of thermodynamic database needed for nuclear waste geochemical storage as well as for technology for extracting cesium resources from saline waters. In this study we developed new not concentration restricted thermodynamic models for solution behavior and solid-liquid equilibrium in CsF-H2O CsOH-H2O and Cs2SO4-H2O systems at 25 °C. To parameterize models we used all available experimental osmotic coefficients data for whole concentration range of solutions and up to saturation point. The new models are developed on the basis of Pitzer ion interactions approach. The predictions of new developed here models are in excellent agreement with experimental osmotic coefficients data (ϕ) in binary solutions from low to extremely high concentration (up to 21.8 mol.kg-1 for CsOH-H2O and up to 35.6 mol.kg-1 for CsF-H2O). The previously developed by Christov by Christov and co-authors and by other authors Pitzer approach based thermodynamic models for five (5) cesium binary systems (CsCl-H2O CsBr- H2O CsI-H2O CsNO3-H2O and Cs2SeO4- H2O) are tested by comparison with experimental osmotic coefficients data and with recommendations on activity coefficients (γ±) in binary solutions. The models which give the best agreement with (ϕ)- and (γ±) -data from low to high concentration up to m(sat) are accepted as correct models which can be used for solubility calculations in binary and mixed systems and determination of thermodynamic properties of precipitating cesium solid phases. The thermodynamic solubility products (ln Kosp) and the Deliquescence Relative Humidity (DRH) of solid phases precipitating from saturated cesium binary solutions (CsF(cr) CsCl(cr) CsBr(cr) CsI(cr) CsOH(cr) CsNO3(cr) Cs2SO4(cr) and Cs2SeO4(cr)) have been determined on the basis of evaluated and accepted binary parameters and using experimental solubility data. The reported mixing parameters [θ(Cs M2+) and ψ(Cs M2+ X)] evaluated by solubility approach for 15 cesium mixed ternary systems (CsCl-MgCl2-H2O CsBr-MgBr2-H2O CsCl-NiCl2-H2O CsBr-NiBr2-H2O CsCl-MnCl2-H2O CsCl-CoCl2-H2O CsCl-CuCl2-H2O CsCl-CsBr-H2O CsCl-RbCl-H2O Cs2SO4-CoSO4-H2O Cs2SeO4-CoSeO4-H2O Cs2SO4-NiSO4-H2O Cs2SeO4-NiSeO4-H2O Cs2SO4-ZnSO4-H2O and Cs2SeO4-ZnSeO4-H2O) are tabulated.

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Research Article Thu, 21 Apr 2022 19:00:36 +0300
Development of accurate chemical thermodynamic database for geochemical storage of nuclear waste. Part II: Models for predicting solution properties and solid-liquid equilibrium in binary nitrate systems https://biorisk.pensoft.net/article/77487/ BioRisk 17: 389-406

DOI: 10.3897/biorisk.17.77487

Authors: Stanislav Donchev, Tsvetan Tsenov, Christomir Christov

Abstract: The main purpose of this study is to develop new thermodynamic models for solution behavior and solid-liquid equilibrium in 10 nitrate binary systems of the type 2–1 (Mg(NO3)2-H2O, Ca(NO3)2-H2O, Ba(NO3)2-H2O, Sr(NO3)2-H2O, and UO2(NO3)2-H2O), 3–1 (Cr(NO3)3-H2O, Al(NO3)3-H2O, La(NO3)3-H2O, Lu(NO3)3-H2O), and 4–1 (Th(NO3)4-H2O) from low to very high concentration at 25 °C. To construct models, we used different versions of standard molality-based Pitzer approach. To parameterize models, we used all available raw experimental osmotic coefficients data (φ) for whole concentration range of solutions, and up to supersaturation zone. The predictions of developed models are in excellent agreement with φ-data, and with recommendations on activity coefficients (γ±) in binary solutions from low to very high concentration. The Deliquescence Relative Humidity (DRH), and thermodynamic solubility product (as ln K°sp) of 12 nitrate solid phases, precipitating from saturated binary solutions have been calculated. The concentration-independent models for nitrate systems described in this study are of high importance for development of strategies and programs for nuclear waste geochemical storage.

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Research Article Thu, 21 Apr 2022 19:00:35 +0300
Pre-monitoring geochemical research of the river sediments in the area of Ada Tepe gold mining site (Eastern Rhodopes) https://biorisk.pensoft.net/article/77466/ BioRisk 17: 379-387

DOI: 10.3897/biorisk.17.77466

Authors: Dimitar Zhelev, Rumen Penin

Abstract: The article depicts the geochemical properties of the landscapes in the Ada Tepe gold mine area before its launching. The research is conducted by examining the heavy metals (Cu, Pb, Zn, Co, Cr, Mn and Ni) content in samples of river sediments in the local landscapes. The research aims to analyse the concentration of heavy metals before the launch of gold mining. The study implements the coefficient of Clarke concentration. The deviation from the background concentrations is a ratio between the element concentration in the collected environmental samples and the Clarke value of the element. The coefficient has a scale from 0 to a particular positive value, corresponding to the level of enrichment of the sample in comparison to the background Clarke value. The values corresponding to the Clarke concentration are equal to 1, the lower values are between 0 and 1 (dispersion) and any value higher than 1 is a case of concentration (enrichment). The obtained results display the researched territory as a natural background area. The content of heavy metals in the river sediments of the researched area (mg/kg, median value) by chemical elements is Cu (15), Zn (72), Pb (17), Mn (461), Ni (35), Co (8) and Cr (60). That is the reason it could be defined as not impacted by human activities and it is not influenced by natural geochemical anomalies. Heavy metals do not pollute the researched landscapes before mining. This outcome is obtained by the geochemical content of the investigated heavy metals in the river sediments.

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Research Article Thu, 21 Apr 2022 19:00:34 +0300
Forests of Breznik municipality https://biorisk.pensoft.net/article/77388/ BioRisk 17: 367-377

DOI: 10.3897/biorisk.17.77388

Authors: Borislav Grigorov, Nikolay Velev, Assen Assenov, Momchil Nazarov, Beloslava Genova, Kiril Vassilev

Abstract: The current study aims to uncover the forest habitat diversity of Breznik municipality, following the EUNIS Classification. Initial data was collected from the Ministry of Environment and Water and the Forestry Management Plans. Forest habitat polygons were spatially processed with the use of the ArcGIS 10.8.1 software package. Field studies were performed to add more detailed information to the analysis. The phytocoenoses of the forest habitats are dominated by Quercus dalechampii, Q. frainetto, Fagus sylvatica, Carpinus betulus. Some artificial plantations with Pinus nigra and P. sylvestris were also present, as well as with non-native species, such as Robinia pseudacacia and Quercus rubra. The results of this study could be used for more in-depth research of the Breznik municipality vegetation.

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Research Article Thu, 21 Apr 2022 19:00:33 +0300
Comparative determination of antimicrobial activity of the Balkan endemic species Stachys thracica Davidov during the process of ex situ conservation https://biorisk.pensoft.net/article/77484/ BioRisk 17: 357-365

DOI: 10.3897/biorisk.17.77484

Authors: Desislava Mantovska, Detelina Petrova, Lybomira Yocheva, Zhenya Yordanova

Abstract: Stachys thracica Davidov – Thracian woundwort is a Balkan endemic plant included in The Red Data Book of Bulgaria with conservational status “rare”. The plants from genus Stachys have a long history of use to treat various diseases, inflammatory conditions, coughs, ulcers, genital tumors, and infected wounds. Due to its limited distribution the information on the biological activity and chemical composition of S. thracica is rather scarce. The aim of the present research is the comparative determination of the antimicrobial activity of methanolic extracts obtained from in situ wild, in vitro cultivated and ex vitro adapted S. thracica plants. The in vitro shoot culture of the Thracian woundwort was maintained in hormone-free MS medium under controlled environmental conditions. The methanolic extracts from in situ, in vitro cultivated and ex vitro adapted S. thracica plants were active mainly against Gram-negative bacteria. All three extracts showed equal activity against Acinetobacter calcoaceticus. The establishment of in vitro shoot culture and its subsequent adaptation in ex vitro conditions was an appropriate alternative approach for the ex situ conservation of S. thracica as well as for the study of its biological activity.

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Research Article Thu, 21 Apr 2022 19:00:32 +0300
Influence of some environmental factors on the distribution of zooplankton complexes in Mandra Reservoir, in Southeastern Bulgaria https://biorisk.pensoft.net/article/77368/ BioRisk 17: 343-355

DOI: 10.3897/biorisk.17.77368

Authors: Eleonora Fikovska, Dimitar Kozuharov, Marieta Stanachkova

Abstract: The aim of the present study was to trace the influence of some environmental factors (w.temperature, wind, transparency, depth) on the distribution of zooplankton communities in the system Reservoir Mandra and the ecotone zones formed at the confluence of rivers Fakiyska, Sredetska, Izvorska and Rusokastrenska. Four samplings were performed at seven sites between February 2020 and January 2021. After determining the species composition and abundance, the results were subjected to structural analysis and Canonical Correspondence Analysis (CCA). A total of 67 taxa were identified, constituting about 48% of the Rotifera group, 27% of Cladocera and 19% of the Copepoda and only 6% from Protozoa. The Shannon-Weaver index for individual species diversity was between 2.37 and 0.62. The positive and negative correlation of zooplankton distribution in CCA shows that the relative abundance of any species depends on specific environmental variables. Analysis showed that temperature and wind had the strongest impact on the distribution of zooplankton.

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Research Article Thu, 21 Apr 2022 19:00:31 +0300
Pteromalid fauna (Hymenoptera, Pteromalidae) in oilseed rape (Brassica napus L.) fields in Bulgaria – species composition and perspectives for biological control https://biorisk.pensoft.net/article/77454/ BioRisk 17: 329-342

DOI: 10.3897/biorisk.17.77454

Authors: Ivaylo Todorov, Toshko Ljubomirov, Vlada Peneva

Abstract: Parasitoid wasps belonging to the family Pteromalidae are widespread and abundant members of the insect communities in the temperate regions of the world. As many other chalcids do, pteromalids serve as natural enemies of the pests in various crops and play an important role in the biological control of these harmful insects. Here we present the results of a field study in Bulgaria which was focused on the diversity of family Pteromalidae in ten oilseed rape fields. All samples were collected by sweep netting on the border line or inside the crop field. A total of 93 pteromalid specimens belonging to 26 taxa were gathered. The most abundant genus was Mesopolobus – 67% of the sampled pteromalids. The most numerous species in the samples was Mesopolobus morys – a well-known key parasitoid of the cabbage seed weevil, Ceutorhynchus obstrictus, in Europe. One species – Halticoptera patellana, is recorded for the first time in Bulgarian fauna. Clearfield oilseed rape fields had relatively higher parasitoid abundance and richness than the fields treated by conventional technology. In the present work we discuss the overall species composition of Pteromalidae obtained from the studied areas and present our point of view on the perspectives for biological control of oilseed rape pests.

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Research Article Thu, 21 Apr 2022 19:00:30 +0300
Monitoring bumblebee pollinator visits to the medicinal plant Gentiana asclepiadea L. (Gentianacese) – a comparison between the periods 1990–1994 and 2017–2020 https://biorisk.pensoft.net/article/76577/ BioRisk 17: 317-327

DOI: 10.3897/biorisk.17.76577

Authors: Ekaterina Kozuharova, Vasil Simeonov

Abstract: Ever increasing data continue to indicate the decline of bumblebee populations. The key factors causing declines in their abundance and diversity are: 1) habitat destruction, 2) loss of floral resources, 3) emerging diseases, 4) increased use of pesticides (particularly neonicotinoids). The aim of this study is to monitor bumblebee visits to Gentiana asclepiadea L, recording pollinator species, and taking measurements of seed set. This plant species is chosen for two reasons: 1) similar data is available from our previous research in the 1990’s and 2) this montane plant species is supposed to be less exposed to hazards from pesticides and habitat destruction. Three study sites were chosen in Mt. Vitosha (SW Bulgaria) where natural populations of G. asclepiadea occur in 1990. The observations of bumblebee activity in the flowers of G. asclepiadea were conducted during the flowering seasons (August and September) of 2017 – 2020 at the same study sites and compared to the data obtained in the previous period (1990–1994). The free pollination fruit set was tested by monitoring of 100 G. asclepiadea flowers each year for development of fruit capsules. The seed set was tested by counting the matured seeds and non-fertilised ovules of 10 fruit capsules each year. A slight decline in bumblebee activity was recorded in 2017 – 2020 in comparison to 1990–1994. This is reflected in the fruit set and the seed set. Our data demonstrates that even in a mountain habitat, where there are fewer direct hazards to bumblebees, that pollination effectiveness has been suppressed over time. This corresponds to a research study which provides evidence that insect biomass fell by 76% in German nature reserves between 1989 and 2016.

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Research Article Thu, 21 Apr 2022 19:00:29 +0300
Plant products with acetylcholinesterase inhibitory activity for insect control https://biorisk.pensoft.net/article/77052/ BioRisk 17: 309-315

DOI: 10.3897/biorisk.17.77052

Authors: Borislav Georgiev, Milena Nikolova, Ina Aneva, Anatoli Dzhurmanski, Boriana Sidjimova, Strahil Berkov

Abstract: Acetylcholinesterase (AChE) inhibitors are widely used in Alzheimer’s treatment, but they are also crucial for their action on organophosphorus insecticides. The latter exert their toxicity by inhibiting the AChE enzyme in insects, leading to their death. Amaryllidaceae alkaloids have been proven to be potent AChE inhibitors. In the present study methanolic extracts and essential oils being obtained from species of Asteraceae, Lamiaceae, Brassicaceae and Amaryllidaceae were evaluated in vitro for AChE inhibitory activity. Ellman’s colourimetric method, with modifications, was used for AChE activity evaluation. According to the activity level, the tested plant products were divided into three categories. First: plant products with strong activity comparable to that of galanthamine; second: plant products with medium activity, with IC50 value about 1 mg/ml and the last group with low activity, with IC50 value greater than 1 mg/ml. Essential oils of Origanum vulgare subsp. hirtum Ietswaart., Satureja pilosa Vel., Monarda fistulosa L., Thymus longedentatus (Degen & Urum.) Ronniger and the methanolic extract of Leucojum aestivum L. showed the most potent activity and were referred to as the first group. Carvacrol was identified as the main component of the most active essential oils. In L. aestivum extract, galanthamine was found as the main alkaloid. The obtained results indicate that essential oils and alkaloid-rich plant extracts possess the strongest AChE inhibitory activity. This gives us a reason to recommend these plant products to be tested for insecticidal activity in the future.

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Research Article Thu, 21 Apr 2022 19:00:28 +0300
Pollinators of Lavandula angustifolia Mill., an important factor for optimal production of lavender essential oil https://biorisk.pensoft.net/article/77364/ BioRisk 17: 297-307

DOI: 10.3897/biorisk.17.77364

Authors: Hristo Valchev, Zdravko Kolev, Bilyana Stoykova, Ekaterina Kozuharova

Abstract: Lavender essential oil is widely used in pharmacy, perfumery and the food industry. It is one of the key essential oils in aromatherapy due to its valuable pharmacological properties. The producers of lavender essential oil are well aware that the greatest quantity of oil is obtained near the end of the inflorescence anthesis and that oil quantity is correlated with the pollination as unpollinated flowers drop down. In addition, it has been demonstrated that oil quality is also highest at the end of the flowering period, related to the gradual increase of monoterpenes (particularly the valuable linalool) and the decrease of sesquiterpenes during flower ontogenesis. The aim of this preliminary study was to measure the occurrence of spontaneous self-pollination in Lavandula angustifolia Mill. and to identify external pollinators. The field experiments were performed in a lavender plantation near Gorna Lipnitza Village, north Bulgaria and in the ex-situ lavender collection in the experimental plot of the Botanical Garden of Sofia University. It was revealed that spontaneous self-pollination did not occur in flowers from which external pollinators had been excluded. Exposed flowers were pollinated by polylectic insects, such as honeybees, several species of bumblebees and butterflies. Wild pollinators (particularly bumblebees) dominated over honeybees at both study sites. Our observations showed that all pollinators actively collected nectar. The pollen baskets of most bees were full, indicating the active consolidation of pollen adhering to the pollinators’ bodies. Although lavender growers tend to place beehives in the fields for optimal essential oil production, it is also crucial to conserve wild pollinators.

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Research Article Thu, 21 Apr 2022 19:00:27 +0300
Evaluation of viral infection levels in intensive and organic poultry farming https://biorisk.pensoft.net/article/77398/ BioRisk 17: 287-296

DOI: 10.3897/biorisk.17.77398

Authors: Plamen M. Kirov, Radostina I. Alexandrova

Abstract: Whereas early organic farming was mainly focused on plant production, in the last decade, the number of organically-managed poultry farms within the European Union has increased significantly. Similar to organic crop production, organic animal farming is based on the same principles: welfare-friendly, sustainable production and resource utilisation without or with very little addition of synthetic substances, such as antibiotics and antiparasitic treatments. These practices, as well as the access to wild animals, make the free-range poultry production systems predisposed to different viral diseases and, thus, associated with potentially higher public health risks or reduction in production quality. On the other hand, intensive farming amplifies the impact of viral diseases due to high density, low genetic diversity and elevated immunodeficiency. The aim of this analytical study is to compare free-range with intensive poultry systems and the occurrence of different viral diseases in these types of farms in the EU over the past decade. The research is based on official data from the statistical office of the European Union, as well as official data from the Member countries. The results were similar in each country and demonstrate that free-range production has a higher incidence of viral diseases with high zoonotical potential. This makes year-round surveillance absolutely necessary, as well as the need for implementation of additional criteria and requirements towards free-range systems.

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Research Article Thu, 21 Apr 2022 19:00:26 +0300
Organic vs conventional farming of oil-bearing rose: Effect on essential oil and antioxidant activity https://biorisk.pensoft.net/article/77488/ BioRisk 17: 271-285

DOI: 10.3897/biorisk.17.77488

Authors: Mima Todorova, Ana Dobreva, Nadezhda Petkova, Neli Grozeva, Mariya Gerdzhikova, Petya Veleva

Abstract: The aim of this study was to establish whether the type of the agricultural system has any influence on the essential oil production and antioxidant activity of industrial cultivated Rosa damascena Mill. in the Rose valley, Bulgaria. Six private farms from Kazanlak (Rose) Valley, Southern Bulgaria were included in the study conducted in the period 2019–2020. The first three selected farms are designated within the conventional farming and the other three are certificated as organic farms. GC/FID and GC/MS analyses were performed; the contents of total polyphenols and flavonoids in the methanol extracts from rose petals were determined. Additionally, the antioxidant activity of rose extracts was evaluated by four reliable methods: 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2´-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS), ferric reducing antioxidant power (FRAP), and cupric reducing antioxidant capacity (CUPRAC) assays. The impact of the agricultural system on the essential oil composition and antioxidant activity was evaluated by ANOVA statistical analysis. The results obtained showed that organic farming produced essential oil with a higher linalool and geraniol content and lower β-citronellol + nerol concentrations than conventional farming. It was found that organic farming production demonstrated a better antioxidant activity evaluated by the three DPPH, ABTS, and CUPRAC methods according to the averaged data for two years, 806.82, 797.66 and 1534.40 mM TE/g dw versus 510.34, 521.94 and 917.48 mM TE/g dw for CF, respectively, with high statistical significance for the DPPH and ABTS analyses. Consequentially, the rose extracts from the organic farming accumulated more phenolic compounds that corresponded to the higher antioxidant potential of the organic roses.

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Research Article Thu, 21 Apr 2022 19:00:25 +0300
Sexually-manifested variations in pigmentation of Boeckella poppei (Copepoda, Calanoida) from Livingston Island (Maritime Antarctica) https://biorisk.pensoft.net/article/75988/ BioRisk 17: 263-269

DOI: 10.3897/biorisk.17.75988

Authors: Ivan Pandourski, Vesela Evtimova, Lyubomir Kenderov

Abstract: Antarctic environments are exposed to high levels of ultraviolet radiation (UVR) that are often detrimental to their biota. Recent studies suggest that the genus Boeckella (Copepoda, Calanoida) has a high level of plasticity in terms of its reaction to UVR, which enables its wide distribution in various water bodies in Antarctica. Boeckella poppei is common in freshwater habitats of all three main biogeographic regions in Antarctica: sub-Antarctic islands, maritime and continental. We present for the first time a specific photoprotective response in populations of B. poppei from Livingston Island, Maritime Antarctica. In non-ovigerous females and in males, we observed uniform distribution of carotenoids in the body, while these pigments were almost entirely concentrated in the ovisacs of mature females. We consider this as a means of progeny protection from the teratogenic influence of the high level of UVR in Antarctic environments. Unequivocally, such adaptation would facilitate the expansion of B. poppei on the continent through colonisation and survival in shallow freshwater habitats. Given that the Antarctic environment is dynamically changing over the past decades and the accelerated retreat of permanent ice cover is a premise for the formation of shallow ponds, B. poppei could be a suitable indicator for reflecting the ongoing global environmental changes in Antarctica.

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Research Article Thu, 21 Apr 2022 19:00:24 +0300
Seasonal variations of the microflora of wedge clam Donax trunculus (Linnaeus, 1758) from the region of Arkutino (Bulgarian Black Sea aquatory) https://biorisk.pensoft.net/article/77097/ BioRisk 17: 253-262

DOI: 10.3897/biorisk.17.77097

Authors: Sevginar Ibryamova, Borislava Pavlova, Elitca Stanachkova, Seniha Salim, Aysel Lyatif, Dimitar Dimitrov, Darina Bachvarova, Nesho Chipev, Nikolay Natchev, Tsveteslava Ignatova-Ivanova

Abstract: The main goal of the present study was to investigate the impact of the state of the environment on the microbiota of the wedge clam Donax trunculus (Linnaeus, 1758) from the region of Arkutino (Bulgarian Black Sea aquatory). The species Enterococcus hirae was isolated during the summer (from May to August). The species P. mendocina prefers the warmer months and the species P. alcaligenes the colder ones. The temperature followed a course of decrease during the period September 2020 to January 2021, followed by a slow increase from February 2021. Comparing May 2020 with May 2021, it became evident that in 2021 the temperature was 1.5 °C lower. We can say that the number of the species P. alcaligenes was twice as high in May 2021. It is likely that this species preferred lower optimum temperatures and constant other parameters. For the species Enterococcus hirae such dependence was not observed - the number remained constant in May, but with increasing temperature the number of microorganisms decreased during the summer months. The species seemed to preferably develop at pH 7.78. The species A. gyllenbergii preferably grows at temperatures between 20.3–25.7 °C and the optimal temperature was 25.7 °C. For C. farmeri the optimum conditions were temperature 26.2 °C and pH 7.3. The species E. vulneris was probably related not only to the increase in water temperature, but also to the anthropogenic factor, as it was found only in July.

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Data Paper Thu, 21 Apr 2022 19:00:23 +0300
Seasonal changes in the pro/antioxidant status of mussels Mytilus galloprovincialis (Lamarck, 1819) from Bulgarian Black Sea coastal habitats https://biorisk.pensoft.net/article/77279/ BioRisk 17: 241-251

DOI: 10.3897/biorisk.17.77279

Authors: Elina Tsvetanova, Almira Georgieva, Nesho Chipev, Albena Alexandrova

Abstract: The pro/antioxidant status of marine macrozoobentic organisms is being increasingly applied in environmental monitoring and conservation programs. The oxidative stress level in marine bivalves can provide valuable information not only on the health of the organisms and their populations, but also on the current state of habitats and ecosystems. The aim of the present study was to make the first comprehensive investigation of the seasonal changes in the antioxidant activity in different organs (gills, digestive gland and foot) of M. galloprovincialis from representative Bulgarian Black Sea coastal habitats. The lipid peroxidation and glutathione levels, as well as activities of the antioxidant enzymes catalase, superoxide dismutase, glutathion peroxidase, glutathion reductase, glucose-6-phosphate dehydrogenase and glutathione-S-transferase of the organs were measured spectrophotometrically. Our hypothesis was that enhanced environmental pressure during the summer season, induced by multiple factors (biogenic, abiogenic and anthropogenic) led to weakening of the antioxidant protection in mussels at the beginning of autumn. The reaction of the mussel organism to the multiple stress factors was specific for the target organ and the type of the biomarker. Significant differences were present in the activity of the antioxidant system in mussels from the northern and southern coastal locations. The seasonal changes in the pro/antioxidant status of mussels were primarily due to specific seasonal changes in factors concerning the marine environment at the concrete locality. Further research is obviously needed to confirm the present results and provide a more complete data of seasonal and spatial changes in the antioxidant defense system of mussels from the Bulgarian Black Sea coastal area and their implementation in biomonitoring programs.

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Research Article Thu, 21 Apr 2022 19:00:22 +0300
Influence of proline and methyl jasmonate priming on in vitro seed germination and seedling development of Chelidonium majus L https://biorisk.pensoft.net/article/77465/ BioRisk 17: 227-240

DOI: 10.3897/biorisk.17.77465

Authors: Iva Doycheva

Abstract: Drought, salinization and heavy metal pollution of soils are main stress factors with an increasing impact on the deterioration of soil quality, yield and crop quality. Seed priming shows good results in improving seed germination, seedling growth and plant development. Proline (Pro) and metyl jasmonate (MeJA) show stimulating activity and help plants overcome stress. The study investigated the effect of Pro, MeJA and hydropriming on seeds sown on water agar supplemented with different concentrations of heavy metals (Cd, Pb, Zn) (HM), NaCl or Polyethylene glycol 6000 (PEG 6000). Chelidonium majus is a medicinal species which is grown as a crop in some parts of Europe. It is an ingredient in some remedies and is becoming an increasingly popular object of research regarding its biological activities. The low concentrations of all heavy metals applied increased the germination of all variants of seeds – control, hydroprimed and those which were Pro and MeJA primed. Seed priming with Pro and MeJA promoted high germination percentage of seeds germinated on water agar with NaCl. PEG 6000 at its higher concentration (5%) slightly increased the seed germination of all variants. The growth of roots and hypocotyls was inhibited by HM and NaCl. However, PEG 6000 slightly influenced their growth.

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Research Article Thu, 21 Apr 2022 19:00:21 +0300
Light and auxin treatments affect morphogenesis and polyphenolics productivity in Artemisia alba Turra cell aggregates in vitro https://biorisk.pensoft.net/article/77452/ BioRisk 17: 213-225

DOI: 10.3897/biorisk.17.77452

Authors: Dobrina Pecheva, Kalina Danova

Abstract: Artemisia alba Turra is an essential oil-bearing shrub, with a Euro-Mediterranean distribution widespread in the south-eastern parts of Europe. Phytochemical investigations have evidenced the presence of volatile mono- and sesquiterpene derivatives, as well as non-volatile sesquiterpenoids, flavonoids and phenolic acids contributing to the anti-inflammatory, antimicrobial, antioxidant and pro-apoptotic activity of different preparations, obtained from the plant. The current research aims at elucidation of the potential for biotechnological polyphenolic compounds productivity of non-differentiated cell lines of the plant. For this purpose, non-differentiated cell aggregates were initiated from either leaf or root explants of the sterile grown plant. They were cultivated either in the dark or at 16/8 h photoperiod in liquid media, supplemented with N6-benzyladenine (BA) as auxin. The cytokinin effects of indole-3-butyric acid (IBA) and 1-naphthalene acetic acid (NAA) were compared. It was established that NAA supplementation was superior to IBA and light treatment – to dark growth conditions in terms of polyphenolics productivity. In addition, NAA supplementation led to better expressed compaction and larger size of the cell aggregates as compared with IBA. The results of the present experiment indicate that secondary metabolites productivity in vitro is a dynamic process closely related to the plant’s growth and development and is in close relation to the interactions of the plant with its environmental conditions.

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Research Article Thu, 21 Apr 2022 19:00:20 +0300
Screening of Amorpha fruticosa and Ailanthus altissima extracts for genotoxicity/antigenotoxicity, mutagenicity/antimutagenicity and carcinogenicity/anticarcinogenicity https://biorisk.pensoft.net/article/77327/ BioRisk 17: 201-212

DOI: 10.3897/biorisk.17.77327

Authors: Teodora Todorova, Krassimir Boyadzhiev, Aleksandar Shkondrov, Petya Parvanova, Maria Dimitrova, Iliana Ionkova, Ilina Krasteva, Ekaterina Kozuharova, Stephka Chankova

Abstract: The aim of the present study was to evaluate the potential genotoxic/antigenotoxic, mutagenic/antimutagenic, and carcinogenic/anticarcinogenic effect of Amorpha fruticosa (AF) fruit, Ailanthus altissima bark hexane (AAEH) and methanol (AAEM) extracts on a model system Saccharomyces cerevisiae. Plants were identified and extracted by Ekaterina Kozuharova. Three concentrations of each extract were tested – 10, 100 and 1000 µg/ml. In vitro pro-oxidant/antioxidant activities were evaluated by DPPH and DNA topology assay. The potential genotoxic/antigenotoxic, mutagenic/antimutagenic and carcinogenic/anticarcinogenic effects were revealed in vivo by: Zimmermman’s test on Saccharomyces cerevisiae diploid strain D7ts1, and Ty1 retrotransposition test on S. cerevisiae haploid strain 551. Zeocin was used as a positive control. Based on the in vitro antioxidant activity the extracts could be arranged as follows: AF>AAEM>AAEH. AAEH possessed moderate oxidative potential. No genotoxic and mutagenic capacity was obtained in vivo for extracts tested. The levels of total aberrants, convertants and revertants were comparable with the control ones. No Ty1 retrotransposition was induced by extracts treatment. Further, the extracts possessed well-expressed antigenotoxic, antimutagenic and anticarcinogenic activity. Significant reduction of the total aberrants, reverse point mutations and Ty1 retrotransposition was obtained. Only the AF extract was found to reduce the levels of zeocin-induced mitotic gene conversion. The three extracts did not possess any genotoxic, mutagenic and carcinogenic effect on Saccharomyces cerevisiae. Based on their protective activity, they can be arranged as follows: AF>AAEM>AAEH which corresponds well with their phytochemical composition. Further experiments could provide more detailed information concerning the mode of action of extracts, as well as their main constituents.

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Research Article Thu, 21 Apr 2022 19:00:19 +0300
Polar and non-polar fraction from Origanum vulgare spp. hirtum methanolic extract – differences in their bioactivity on Chlamydomonas reinhardtii test system https://biorisk.pensoft.net/article/78169/ BioRisk 17: 191-200

DOI: 10.3897/biorisk.17.78169

Authors: Maria Dimitrova Todorova, Petya Nikolaeva Parvanova, Teodora Ivanova Todorova, Milena Tihomirova Nikolova, Strahil Hristov Berkov, Stephka Georgieva Chankova

Abstract: Aim: To compare the bioactivity of both polar and non-polar fraction of Origanum vulgare spp. hirtum methanolic extract on Chlamydomonas reinhardtii. Material and methods: The polar and non-polar fractions were derived from aerial parts of Origanum vulgare ssp. hirtum, collected during the flowering stage from the ex-situ collection of IBER-BAS. GC/MS analysis of both fractions was done following the standard protocol. The measured mass spectra were deconvoluted by the Automated Mass Spectral Deconvolution and Identification System (AMDIS), before comparison with the databases. Chlamydomonas reinhardtii 137C+ (WT) was used as a test system. Spot-test, cell survival fraction (SF), test of “visible mutations” and CFGE (for measurement of induced DNA double-strand breaks (DSBs)) were applied. Results: The polar fraction did not possess genotoxic, mutagenic as well as DNA-damaging effect. The situation with the non-polar fraction was quite different. Even at the lowest concentration of 250 ppm, cell survival was decreased by 60% (SF = 0.41 ± 0.08). Treatment with concentrations equal to/or greater than 500 ppm resulted in around 100% lethality. A mild mutagenic effect was obtained for the concentration of 250 ppm non-polar fraction (IM = 4.83 ± 0.004). Well-expressed and concentration-dependent induction of DSBs for even the strong DNA fragmentation was observed after the treatment with the non-polar fraction. Conclusions: The different bioactivity of the two fractions correlated well with their different chemical composition. The polar fraction, rich in sugars, organic acids and flavonoid glycosides, did not possess genotoxic and mutagenic potential. The strong genotoxic potential of the non-polar fraction might be related to carvacrol content (37.08%), which is not present in the composition of the polar fraction. To the best of our knowledge, this study provides the first information that the carvacrol-rich non-polar fraction of Origanum vulgare spp. hirtum methanolic extract possesses genotoxic, mutagenic and DNA damaging effect on some low eukaryotes, such as C. reinhardtii. Further experiments with carvacrol should be done in order to clarify the exact mechanism of action.

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Research Article Thu, 21 Apr 2022 19:00:18 +0300
On the mode of action of Origanum vulgare spp. hirtum methanolic extract and essential oil on Chlamydomonas reinhardtii https://biorisk.pensoft.net/article/77313/ BioRisk 17: 179-190

DOI: 10.3897/biorisk.17.77313

Authors: Maria D. Todorova, Petya N. Parvanova, Teodora I. Todorova, Georgi D. Dronchev, Milena T. Nikolova, Strahil H. Berkov, Stephka G. Chankova

Abstract: Aim: To reveal whether methanolic extract and essential oil from Origanum vulgare subsp. hirtum in doses causing even low levels of mortality in aphids, would have harmful effects on plants-genotoxic, mutagenic and/or DNA damaging. Materials and methods: Aerial parts of Origanum vulgare ssp. hirtum from the ex-situ collection of IBER, BAS during flowering were collected. Extraction and isolation procedures, as well as GC/MS analysis of essential oil and methanolic extract were performed by standard protocols. The components were identified by comparing their relative retention times to the retention times of authentic standards, and with mass spectra with the NIST. Test system: Chlamydomonas reinhardtii strain 137 C+ (WT). Endpoints: “clonal” assay, the test of “visible mutations”, constant field gel electrophoresis. Statistics: GraphPad Prism version 6.04 (San Diego, USA) and One-way Analysis of Variance ANOVA with multiple comparisons using the Tukey method. Results: A good correlation was observed between chemical composition of essential oil and methanolic extract, and their mode of action. Our genotoxic and double strand breaks results demonstrated mild genotoxic and statistically non-significant DNA damaging potential of methanolic extract and concentration-dependent well - expressed genotoxic and DNA damaging potential of essential oil. A good relationship between increased double strand breaks levels and decreased survival might be related to one of the main constituents of essential oil, suspected to be carvacrol. No mutagenic effect for ME and EO was found. Conclusion: Well-expressed toxic/genotoxic capacity of essential oil, as well as its capacity to damage DNA inducing double strand breaks, but the absence of mutagenic potential, could be considered as a good reason to recommend Origanum vulgare subsp. hirtum essential oil as a promising candidate for purposes of “green” technologies.

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Research Article Thu, 21 Apr 2022 19:00:17 +0300
State of the antioxidant defense system in wedge clams from Bulgarian Black Sea as a measure of resistance to environmental impacts https://biorisk.pensoft.net/article/77384/ BioRisk 17: 169-178

DOI: 10.3897/biorisk.17.77384

Authors: Almira Georgieva, Elina Tsvetanova, Nesho Chipev, Albena Alexandrova

Abstract: Pollution and climate change can induce oxidative stress (OS) in aquatic organisms. Reduced activity or incoordination between antioxidant enzymes in marine bivalves may cause cellular impairment with effects on higher levels of ecological organization. The present study aims to assess the condition factor and the activity of antioxidant enzymes catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione-S-transferase (GST), and glutathione concentration (GSH) in soft tissues of Donax trunculus (Linnaeus, 1758) as indicators of the state of marine ecosystems along the Bulgarian Black Sea coast. The wedge clams were sampled manually from different localities in June and in September. The activity of antioxidant enzymes and GSH concentrations varied both seasonally and among localities. Higher values of GSH, SOD and GPx were registered in wedge clams collected in autumn compared to those collected in summer. In wedge clams higher activity of the major phase II detoxification enzyme GST was observed in summer at localities with intensive tourism, suggesting an activation of the cell detoxification processes, presumably in response to increased environmental pressure. In conclusion, the observed presence of elevated enzyme activities suggested activation of the antioxidant protection system of the wedge clams in response to environmental pressure, indicating their ability to cope with induced OS and adapt to local conditions, and thus maintain ecosystem health.

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Research Article Thu, 21 Apr 2022 19:00:16 +0300
Application of residual sludges from wastewater treatment technologies for construction of biofertiliser https://biorisk.pensoft.net/article/77463/ BioRisk 17: 157-168

DOI: 10.3897/biorisk.17.77463

Authors: Mihaela Belouhova, Dobromira Yaneva, Yana Topalova

Abstract: To stimulate plant development in phytoremediation or in the cultivation of non-food crops in potentially contaminated soils, a biotechnologically created product could be applied. The aim of this study was to explore the possibility of creation of biofertiliser, based on activated sludge combined with bacterial strain with detoxifying and plant growth promoting properties. The presented study is focused on the effect of phenol in the following concentrations: 5 mg/l, 100 mg/l, 250 mg/l, 500 mg/l and 1000 mg/l on the metabolic activity of Brevibacillus laterosporus BT271. The gradual increased concentration of phenol was used to study the metabolic activity of mineralised activated sludge and B. laterosporus BT271. The CTC/DAPI staining showed high activity of the bacteria even at the highest concentration. The greatest amount of biomass was accumulated at 5 mg/l phenol (4.44 × 107 cells/ml). At this toxicant concentration, a total dehydrogenase activity of 5.72 × 10-4 μg H+/ml*min was found. Studies of the metabolic activity of microorganisms in experiments involving a combination of mineralised activated sludge, B. laterosporus BT271 and phenol at three concentrations (5 mg/l, 250 mg/l and 1000 mg/l) showed the highest value for dehydrogenase activity in the variant with average phenolic concentration (up to 6.39 × 10-6 μg H+/ml*min. The results proved the detoxification potential of B. laterosporus BT271 when different concentrations of phenol were present. The combination of a mineralised activated sludge and selected highly active biodegrading B. laterosporus BT271 showed valuable properties of detoxification and metabolic activity and keep these potentials up to 1000mg/l phenol.

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Research Article Thu, 21 Apr 2022 19:00:15 +0300
Natural zeolites as detoxifiers and modifiers of the biological effects of lead and cadmium in small rodents: A review https://biorisk.pensoft.net/article/77435/ BioRisk 17: 147-155

DOI: 10.3897/biorisk.17.77435

Authors: Michaela Beltcheva, Peter Ostoich, Iliana Aleksieva, Roumiana Metcheva

Abstract: The present investigation analyzes the literature about the toxicity of Cd and Pb in small rodents’ organisms and the role of natural zeolites as modifiers of the biological effects. An array of ecotoxicological, morpho-physiological, hematological, genetic and biochemical methods as most representative are under discussion as a basic point for further exploration of biological effects in laboratory mice. The review of existing results demonstrated that there is abundant data on the sorption of lead and cadmium by modified natural zeolites in water and soils. Nevertheless, there is insufficient data on the ion exchange capacity and biological effects of this sorbent in living organisms, especially regarding Cd detoxification. On the basis of the current review, it is possible to conclude that future investigations in this field will elucidate the potential of the use of zeolites as successful detoxifiers against heavy metals and other toxic elements in living organisms.

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Review Article Thu, 21 Apr 2022 19:00:14 +0300
In vitro reconstitution of complexes of stress HliA protein with pigments https://biorisk.pensoft.net/article/77306/ BioRisk 17: 139-146

DOI: 10.3897/biorisk.17.77306

Authors: Lubov Sharapova, Nadezhda Yurina

Abstract: Proteins similar to Hli (high light inducible) proteins of cyanobacteria are present in all photosynthetic eukaryotes and are necessary for survival in various stressful conditions, although their exact function is not fully understood. In current study, the recombinant stress-induced protein HliA of cyanobacterium Synechocystis was isolated and characterised for the first time. The synthetic gene of HliA protein was created and cloned into plasmid for expression of recombinant protein with Hisx6-tag at the C-terminus in bacteria. Recombinant HliA protein of Synechocystis was isolated by metal-affinity chromatography. The HliA protein was reconstituted with chlorophyll a and carotenoids. Using circular dichroism spectroscopy, it was shown that chlorophyll a and carotenoids interact in vitro with the HliA protein. The binding of pigments to the HliA protein favours the protective function of this protein. Apparently, Hli proteins are involved in the coordinated delivery of pigments for the biogenesis of photosynthetic complexes, thereby reducing the risk of accumulation of phototoxic free chlorophyll molecules. Current results are important for understanding the processes of photoprotection in either cyanobacteria or algae and higher plants.

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Research Article Thu, 21 Apr 2022 19:00:13 +0300
Cellular susceptibility and oxidative stress response to menadione of logarithmic, quiescent, and nonquiescent Saccharomyces cerevisiae cell populations https://biorisk.pensoft.net/article/77320/ BioRisk 17: 127-138

DOI: 10.3897/biorisk.17.77320

Authors: Polya Galinova Marinovska, Teodora Ivanova Todorova, Krassimir Plamenov Boyadzhiev, Emiliya Ivanova Pisareva, Anna Atanasova Tomova, Petya Nikolaeva Parvanova, Maria Dimitrova, Stephka Georgieva Chankova, Ventsislava Yankova Petrova

Abstract: The aim of the present study was to compare cellular susceptibility and oxidative stress response of S. cerevisiae logarithmic (log), quiescent (Q), and non-quiescent (NQ) cell populations to menadione – a well-known inducer of oxidative stress. Three main approaches were used: microbiological – cell survival, molecular – constant field gel electrophoresis for detection of DNA double-strand breaks (DSB), and biochemical – measurement of reactive oxygen species (ROS) levels, oxidized proteins, lipid peroxidation, glutathione, superoxide dismutase (SOD) and catalase on S. cerevisiae haploid strain BY4741. The doses causing 20% (LD20) and 50% (LD50) lethality were calculated. The effect of menadione as a well-known oxidative stress inducer is compared in the log, Q, and NQ cells. Survival data reveal that Q cells are the most susceptible to menadione with LD50 corresponding to 9 µM menadione. On the other hand, dose-dependent DSB induction is found only in Q cells confirming the results shown above. No effect on DSBs levels is observed in log and NQ cells. Further, the oxidative stress response of the cell populations is clarified. Results show significantly higher levels of SOD and ROS in Q cells than in log cells after the treatment with 100 µM menadione. On the other side, higher induction of oxidized proteins, malondialdehyde, and glutathione is observed after menadione treatment of log cells. Our study provides evidence that Saccharomyces cerevisiae quiescent cells are the most susceptible to the menadione action. It might be suggested that the DNA damaging and genotoxic action of menadione in Saccharomyces cerevisiae quiescent cells could be related to ROS production.

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Research Article Thu, 21 Apr 2022 19:00:12 +0300
Comparative study on the oxidative stress of commercially important fish species from localities with different ecological conditions along the Bulgarian Black Sea coast https://biorisk.pensoft.net/article/77300/ BioRisk 17: 117-126

DOI: 10.3897/biorisk.17.77300

Authors: Albena Alexandrova, Yordan Raev, Dimitar Dimitrov, Nesho Chipev, Elina Tsvetanova, Almira Georgieva, Violin Raykov

Abstract: The aim of the present study was to perform a pilot assessment and analysis of the oxidative stress (OS) level in four commercially important fish species (round goby, red mullet, sprat and horse mackerel) from different localities of the Bulgarian Black Sea coast. The fish were sampled during trawl selectivity experiments. The OS level in the fish was assessed by measuring lipid peroxidation (LPO), glutathione concentration (GSH), activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione-S-transferase (GST), as well as acetylcholine esterase (AChE) in gills and liver. Round goby and red mullet caught in the Nessebar Bay showed clear signs of OS with the highest levels of LPO and GST activities, accompanied by the lowest AChE activities in both liver and gills. On the contrary, round goby caught near Maslen Nos (a region with good ecological conditions) were least affected by OS with low LPO and high GSH concentrations and SOD activity. There were no significant differences in the OS bioindicators of horse mackerel from the different localities. Sprat caught in Nessebar Bay, compared to those caught from the other localities, showed presence of OS indicated by lower GSH levels and relatively higher CAT, GPx and GST activities, accompanied by low AChE activity in gills. It can be concluded that round goby and red mullet were more vulnerable to OS induced by marine environmental factors than the horse mackerel and sprat. However, their antioxidant defense system allows them to tolerate and adapt to the environment of their habitats. Further studies are needed for the assessment of OS in important fish species in the Bulgarian part of the Black Sea.

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Research Article Thu, 21 Apr 2022 19:00:11 +0300
Saccharomyces cerevisiae yeast cells as a test system for assessing Zeocin toxicity https://biorisk.pensoft.net/article/77227/ BioRisk 17: 105-116

DOI: 10.3897/biorisk.17.77227

Authors: Polya Marinovska, Teodora Todorova, Anna Tomova, Emiliya Pisareva, Krassimir Boyadzhiev, Martin Dimitrov, Petya Parvanova, Maria Dimitrova, Stephka Chankova, Ventsislava Petrova

Abstract: Having unique genetic machinery and a high degree of conservation with higher eukaryotes, the yeast Saccharomyces cerevisiae is recognised as a smart experimental system for studying the modes of chemical toxicity. The present study was undertaken to elucidate the changes in the intracellular redox homeostasis and key macromolecule structure following exposure to Zeocin. Cell populations of logarithmic, quiescent (Q) and non-quiescent (NQ) cells of Saccharomyces cerevisiae BY4741 were used as a model to examine the cytotoxic effect of this radiomimetic. The levels of endogenous ROS, oxidized lipids, carbonylated proteins, and glutathione were analysed after treatment with Zeocin (IC50). An increase in ROS production and respectively increased oxidative stress was detected in all three types of cell populations, with the highest degree being observed in proliferating S. cerevisiae BY4741 cells. The stress response of both proliferating and stationary phase (Q and NQ) cells to Zeocin included an overexpression of glutathione. The quiescent cells also showed very low DNA susceptibility to high Zeocin concentration (100–300 µg/ml), presented as no induced double-strand breaks (DSBs) in the macromolecule. Based on our research it could be concluded that the cellular physiological state is a critical factor determining the resistance to environmental stress with Q cells being the most robust.

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Research Article Thu, 21 Apr 2022 19:00:10 +0300
Assessment of PAHs accumulation in Donax trunculus (Linnaeus, 1758) (Bivalvia, Donacidae) from the Bulgarian Black Sea Coast https://biorisk.pensoft.net/article/77343/ BioRisk 17: 95-104

DOI: 10.3897/biorisk.17.77343

Authors: Stanislava K. Georgieva, Mona D. Stancheva, Zlatina V. Peteva, Tsveteslava I. Ivanova, Albena V. Alexandrova

Abstract: Anthropogenic pollution of marine ecosystems is one of the main sources of polycyclic aromatic hydrocarbons (PAHs). Marine bivalves are often used as bioindicators of environmental pollution due to their wide distribution and capability of xenobiotic bioaccumulation. The aim of the present study was to assess the presence of PAHs in soft tissues of wedge clams Donax trunculus (Linnaeus, 1758), collected from sublittoral sandy habitats at different locations off the Bulgarian Black Sea coast. Wedge clams from the different locations showed variations in the content of accumulated PAHs’ compounds. The concentrations of PAHs were measured by gas chromatography system with mass spectrometry detection. The total PAHs content (sum of 13 PAHs’ compounds) measured was in the range from 5.59 to 50.50 ng/g wet weight and was comparable with other European studies. The compounds phenanthrene and fluorene were most abundant in all analyzed samples. The results showed that low molecular weight (LMW) PAHs (2 and 3 aromatic rings) were predominant, accounting for 91% of the total PAHs levels, while high molecular weight (HMW) PAHs (4–5- and 6- rings) presence was 8.9% on average. The ratio LMW/HMW PAHs was higher than one, suggesting predominant pollution of petrogenic origin. The concentrations of benzo (a)pyrene did not exceed the limit set in EC Regulation although it was detected in 20% of the analyzed samples. In conclusion, maximum overall PAHs content was found in clams from Arkutino, while minimum PAHs content was present in samples from Elenite. The Sum PAH4 (sum of four polycyclic aromatic hydrocarbons: benzo[a]pyrene, chrisene, benzo[a]anthracene, and benzo[b]fluoranthene) in the wedge clams for all localities studied was below legislation limits. Data from the present research can be used for assessing pollution levels in the marine environment and also risk of human exposure to PAHs using D. trunculus as bioindicator species.

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Research Article Thu, 21 Apr 2022 19:00:09 +0300
Heavy metal stress response of microalgal strains Arthronema africanum and Coelastrella sp. BGV https://biorisk.pensoft.net/article/77483/ BioRisk 17: 83-94

DOI: 10.3897/biorisk.17.77483

Authors: Zornitsa Karcheva, Zhaneta Georgieva, Alexander Tomov, Detelina Petrova, Miroslava Zhiponova, Ivanina Vasileva, Ganka Chaneva

Abstract: The present study compared the stress response of two microalgal strains – Arthronema africanum (Cyanoprokaryota) and Coelastrella sp. BGV (Chlorophyta), after heavy metals’ treatment. Changes of algal growth, pigment and protein content were analyzed after adding Cu, Cd and Pb (50 µM and 100 µM) to the nutrition medium. It was found that Cd and Pb significantly inhibited growth and protein biosynthesis of microalgae, but the effect of Cu remained less pronounced. In both strains, a decrease of chlorophyll content was observed, while carotenoid content markedly increased, especially in Coelastrella sp. BGV biomass. The addition of 100 µM Cd and 100 µM Pb to the medium caused a strong enhancement of malondialdehyde in both microalgal strains, which corresponded to the significant increase of superoxide dismutase and catalase activity. The antioxidant enzymes appeared to be differently altered by heavy metals’ exposure. The activity of SOD in the Arthronema africanum cells was most strongly affected by Cd, in contrast to Coelastrella sp. BGV that was highly increased by 100 µM Pb. The application of 100 µM Cd and 100 µM Pb increased in a similar manner catalase activity in both microalgae. The strains that were studied showed a high absorption capacity for metal ions, especially for Pb, which was absorbed largely than Cd and Cu. For that reason, we assumed that both microalga and, in particular, Coelastrella sp. BGV, could be successfully used for treatment of contaminated water bodies.

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Research Article Thu, 21 Apr 2022 19:00:08 +0300
Trace metal accumulation in tissues of wedge clams from sandy habitats of the Bulgarian Black Sea coast https://biorisk.pensoft.net/article/77290/ BioRisk 17: 73-81

DOI: 10.3897/biorisk.17.77290

Authors: Darina Bachvarova, Mona Stancheva, Tsveteslava Ignatova-Ivanova, Sevginar Ibryamova, Nesho Chipev, Albena Alexandrova

Abstract: The aim of the present study was to carry out an initial screening of trace metals bioaccumulation in soft tissues of the wedge clam (Donax trunculus Linnaeus, 1758) from different localities of the Bulgarian Black Sea coastal area and to evaluate the bioindicator potential of this species. Wedge clams were collected in June and September 2020 from sublittoral sandy habitats at different localities of the Bulgarian Black Sea coast. Soft tissues of individual clams were digested with nitric acid followed by ICP-OES analytical determination. The content of trace metals in the wedge clams differed significantly amongst localities. Higher metal content was present in wedge clams from Sveti Vlas, Shkorpilovtsi, Slanchev Bryag, Ahtopol and Kranevo. The highest values of lead (Pb) (2.51 mg/kg) and cadmium (Cd) (0.32 mg/kg) were found in samples from Sveti Vlas and the highest concentration of copper (Cu) (34.12 mg/kg), iron (Fe) (269.52 mg/kg) and nickel (Ni) (0.32 mg/kg) were detected in wedge clams from Shkorpilovtzi. Maximum content of chromium (Cr) (0.58 mg/kg) was present in samples from Slanchev Bryag, together with high values of Fe. The highest concentration of zinc (Zn) (18.04 mg/kg) together with high values of Cr and Fe were measured in wedge clams from Irakli. In conclusion, the wedge clams from the localities known to have higher coastal inflows and touristic pressures, i.e. Varna, Shkorpilovtzi, Sveti Vlas, Slanchev Bryag and Ahtopol accumulated significantly higher metal elements in their tissues. Only few significant seasonal differences in the concentration of metal elements in wedge clams were present and the observed seasonal variations were probably connected to the hydrological parameters of the ecosystems. The wedge clam D. trunculus is a suitable bioindicator for assessment and monitoring of metal pollution in the Bulgarian Black Sea environment.

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Research Article Thu, 21 Apr 2022 19:00:07 +0300
Environmental impact assessment of discharge of treated wastewater effluent in Upper Iskar sub-catchment https://biorisk.pensoft.net/article/77381/ BioRisk 17: 59-71

DOI: 10.3897/biorisk.17.77381

Authors: Veronika Yordanova, Yovana Todorova, Mihaela Belouhova, Lyubomir Kenderov, Valentina Lyubomirova, Yana Topalova

Abstract: The upper Iskar sub-catchment is one of Bulgaria’s most important economic and socially significant water sources because of its role in supplying Sofia with drinking water. Among the critical factors that carry potential high-risk levels for water quality in this hydrosystem are the discharge from the Samokov Wastewater Treatment Plant (WWTP), diffuse pollution from agriculture, and the percolation of untreated sewage from the small villages. In this study, we assessed the effect of treated wastewater effluent on water quality, and on the ecological state and microbial communities in the river sector of Samokov’s WWTP discharge area. The assessment was based on the complex use of chemical and microbiological indicators and biological quality elements. The concentrations of organics, nutrients and microcomponents were determined with results confirming the expected increase for parameters associated with the discharge of urban wastewater. The ecological state, according to macrozoobenthos indicators, was “good” throughout the river sector but local deterioration was registered in a proximal location downstream of the WWTP outfall. The analysis of stream water and bed sediment microbial communities by a fluorescent technique showed the high metabolic activity and intensive transformation processes in addition to high abundance registered with standard cultivation methods. The importance of the studied sub-catchment for the functioning of the urban water cycle, and for the quality of Sofia’s drinking water, underlines the need to extend an existing monitoring program with a more detailed assessment of the environmental impact of wastewater discharge.

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Research Article Thu, 21 Apr 2022 19:00:06 +0300
Radiation status of soils from the region of the Eastern Rhodopes (Southern Bulgaria) https://biorisk.pensoft.net/article/77432/ BioRisk 17: 45-57

DOI: 10.3897/biorisk.17.77432

Authors: Milena Hristozova, Radoslava Lazarova

Abstract: Local values of natural radiation background in soils from unexplored regions in the Eastern Rhodopes were established. The impact of anthropogenic activity as a potential risk for increase in radiation background was assessed. Soil samples from areas near the liquidated lead-zinc mines – Madzharovo, gold mine – Ada Tepe, Krumovgrad, lead-zinc complex – Kardzhali, Neochim – Dimitrovgrad, deposits for extraction of gneiss, marble quarries, etc. were analyzed to study possible contamination. Specific activity of natural radionuclides 210Pb, 238U, 226Ra, 235U, 232Th, 40K and technogenic 137Cs in the studied samples was determined by gamma spectrometric analysis with Multichannel analyzer DSA 1000, production of CANBERRA and HPGe-detector.

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Research Article Thu, 21 Apr 2022 19:00:05 +0300
Differences in bacterial functional profiles from loamy sand and clay loam textured soils under fungicide QuadrisR impact https://biorisk.pensoft.net/article/76939/ BioRisk 17: 31-43

DOI: 10.3897/biorisk.17.76939

Authors: Michaella Petkova, Anelia Kenarova, Silvena Boteva, Stela Georgieva, Christo Chanev, Galina Radeva

Abstract: The non-target effect of the fungicide QuadrisR on the bacterial community from grassland loamy sand (LS) and cropland clay loam (CL) soils with unknown history of fungicide usage was investigated. QuadrisR was applied to soil mesocosms at 0.0 mg kg-1 (Az0), 2.90 mg kg-1 (Az1), 14.65 mg kg-1 (Az2) and 35.0 mg kg-1 (Az3) calculated towards the active ingredient azoxystrobin (Az). Response of bacterial communities to QuadrisR was investigated during a 120-day incubation experiment, evaluating the shifts in bacterial catabolic profiles by the community-level physiological profiling (CLPP) technique and Biolog EcoPlatesTM method. QuadrisR decreased the overall catabolic activity (AWCD) of soil bacterial communities and the rate of decrease was independent of soil type and fungicide concentration. Fungicide affected negatively the utilisation of amines and positively that of amino acids in both soil types, whereas the effects on other carbon guilds (carbohydrates, carboxylic acids and polymers) corresponded closely to the respective soil type and fungicide concentration. Results indicated the presence of non-target effects of QuadrisR on bacterial functioning; hence, it is important to address the fungicide side-effects on soil health.

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Research Article Thu, 21 Apr 2022 19:00:04 +0300
Correlation between bacterial abundance, soil properties and heavy metal contamination in the area of non-ferrous metal processing plant, Southern Bulgaria https://biorisk.pensoft.net/article/77458/ BioRisk 17: 19-30

DOI: 10.3897/biorisk.17.77458

Authors: Radina Nikolova, Michaella Petkova, Nikolai Dinev, Anelia Kenarova, Silvena Boteva, Dimitar Berov, Galina Radeva

Abstract: In the present study, the correlation between bacterial abundance and soil physicochemical properties along the heavy metal contamination gradient in the area of non-ferrous metal processing plant was assessed. Our results showed that bacterial abundance (number of heterotrophic bacteria and number of 16S rRNA gene copies) decreased with 45–56% (CFU) and 54–87% (16S rRNA gene) along the Zn, Pb and Cd contamination gradient. The total bacterial abundance (16S rRNA gene) increased exponentially in contrast to the abundance of heterotrophic bacteria. The reduction of bacterial abundance in heavily contaminated soil indicated that the soil properties (soil pH, total organic carbon, inorganic ions, soil texture) could modify the effects of heavy metals and the response of microorganisms to that stress in long-term contaminated soils.

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Research Article Thu, 21 Apr 2022 19:00:03 +0300
Ecocide – global consequences (pesticides, radionuclides, petroleum products) https://biorisk.pensoft.net/article/77438/ BioRisk 17: 7-18

DOI: 10.3897/biorisk.17.77438

Authors: Roumiana Metcheva, Peter Ostoich, Michaela Beltcheva

Abstract: The problem of environmental pollution is becoming increasingly important on a global scale. Man has oversaturated the environment of his habitat with harmful and most often toxic waste. It is difficult to describe all the toxic substances, as a separate book can be written for each group. The term “ecocide” has been introduced, which reflects large-scale destruction of the natural environment. We will focus only on three classes of pollutants that are of particular concern, creating environmental conflicts. These are: • Pesticides are extremely toxic and create large amounts of non-degradable waste. It accumulates in tissues and organs of target organisms, becoming toxic and causing serious pathological changes in the body, mainly at the cellular and subcellular levels, causing various diseases and as a result, serious changes in the structure and functions of the populations and the whole ecosystem are increasingly observed. • Waste from the nuclear industry and radioactive fallout from nuclear explosions. It is especially dangerous that radioactive elements can be concentrated in certain organs. • Petroleum products - often large quantities end up in the seas and oceans, along with industrial waste of various kinds, impossible to compensate for by nature and they pose a serious threat to ecosystems, many of which have already been destroyed. At the submolecular level, chemical and physical effects can lead to genetic rearrangements (mutations); destructive ionization in the tissues of every living being, sometimes with completely unexpected consequences for humans.

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Research Article Thu, 21 Apr 2022 19:00:02 +0300
International seminar of ecology – 2021 “Current trends of ecology” https://biorisk.pensoft.net/article/84978/ BioRisk 17: 1-5

DOI: 10.3897/biorisk.17.84978

Authors: Stephka Chankova

Abstract: none

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Editorial Thu, 21 Apr 2022 19:00:01 +0300
Citizen scientists significantly improve our knowledge on the non-native longhorn beetle Chlorophorus annularis (Fabricius, 1787) (Coleoptera, Cerambycidae) in Europe https://biorisk.pensoft.net/article/61099/ BioRisk 16: 1-13

DOI: 10.3897/biorisk.16.61099

Authors: Matthias Seidel, Maren Lüttke, Christian Cocquempot, Katy Potts, Wil J. Heeney, Martin Husemann

Abstract: The Asian bamboo borer Chlorophorus annularis is a beetle species that has been introduced in many countries globally. Originating in Southeast Asia, it can now be found in the Americas, South Africa, the Middle East, Australasia and Europe. The literature record of the species in Europe consists of findings of single individuals usually associated with imported bamboo products. A general European effort in surveying C. annularis was never undertaken, since the overall scientific consensus was that the species cannot establish here. Yet, recent records in Genk, Torhout (Belgium) and in Hamburg (Germany) do not seem directly associated with a recently imported product and hence may indicate otherwise. Such a shortfall in recording commonly imported, potentially invasive species may be counteracted through citizen science initiatives, allowing for continuous, high density monitoring. In this paper we present thirteen new records of the species from five European countries, including two new country records, mostly going back to interested citizen scientists.

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Research Article Tue, 9 Mar 2021 16:44:00 +0200
Selection of non-target Lepidoptera species to test Bt maize effects in the laboratory: which species and how to breed them? https://biorisk.pensoft.net/article/59823/ BioRisk 15: 45-65

DOI: 10.3897/biorisk.15.59823

Authors: Andreas Lang, Matthias Dolek, Marina S. Lee, Anja Freese-Hager, Mathias Otto

Abstract: Bt maize targeting Lepidopteran pests poses potential risks for non-target (NT) butterflies and moths which are addressed in the environmental risk assessment of genetically modified crop plants. For this purpose, eco-toxicological tests are often conducted with specific NT species in the laboratory in order to assess possible adverse effects. As only a limited number of surrogate species can be addressed, the choice of focal species to be tested is an important decision. However, practical and standardised selection procedures have hardly been developed and applied for NT Lepidoptera, so far. Here, we present a transparent and systematic selection process of suitable test species for Germany, involving selection criteria such as exposure to Bt maize, habitat range and laboratory maintenance of the species. As a result, we compiled a list of 15 lepidopteran species particularly appropriate for testing the adverse effects of Bt maize in the laboratory. In addition, we collected and reviewed published reports for breeding methods of Lepidoptera, which provides essential information on maintaining lab stocks of NT Lepidoptera. The presented selection procedure allows focusing on the relevant test species in a transparent and reproducible way, and supplies the breeding knowledge required to breed and maintain them, which will be of great utility for the future assessment on possible risks of Bt maize cultivation to non-target Lepidoptera.

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Research Article Tue, 29 Dec 2020 10:26:59 +0200
Total and faecal coliforms presence in cenotes of Cancun; Quintana Roo, Mexico https://biorisk.pensoft.net/article/58455/ BioRisk 15: 31-43

DOI: 10.3897/biorisk.15.58455

Authors: Jessica Borbolla-Vazquez, Paul Ugalde-Silva, José León-Borges, Job Alí Díaz-Hernández

Abstract: The large increase in population in Cancun, Mexico has increased domestic, agricultural and industrial activities, resulting in inadequate solid and liquid waste management that can affect underground aquifers. One of the factors which affects water quality is coliform bacteria. The present study focused on determining the presence of total and faecal coliforms in ten urban cenotes in Cancun. Sampling was carried out in the dry and rainy seasons of 2018. The Most Probable Number (MPN) technique was used to determine the concentration of coliform bacteria. The results from the analyses indicate that the ten cenotes are contaminated with total and faecal coliforms. Additionally, the concentration of coliforms increases during the rainy season. We conclude that all the cenotes are contaminated with faecal coliforms and suggest that more studies are necessary to determine the origin of this contamination and the impact on the ecosystem.

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Research Article Wed, 2 Dec 2020 10:29:59 +0200
Beyond limits – the pitfalls of global gene drives for environmental risk assessment in the European Union https://biorisk.pensoft.net/article/49297/ BioRisk 15: 1-29

DOI: 10.3897/biorisk.15.49297

Authors: Marion Dolezel, Christoph Lüthi, Helmut Gaugitsch

Abstract: Gene drive organisms (GDOs) have been suggested as approaches to combat some of the most pressing environmental and public health issues. No such organisms have so far been released into the environment, but it remains unclear whether the relevant regulatory provisions will be fit for purpose to cover their potential environmental, human and animal health risks if environmental releases of GDOs are envisaged. We evaluate the novel features of GDOs and outline the resulting challenges for the environmental risk assessment. These are related to the definition of the receiving environment, the use of the comparative approach, the definition of potential harm, the stepwise testing approach, the assessment of long-term and large-scale risks at population and ecosystem level and the post-release monitoring of adverse effects. Fundamental adaptations as well as the development of adequate risk assessment methodologies are needed in order to enable an operational risk assessment for globally spreading GDOs before these organisms are released into environments in the EU.

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Research Article Mon, 4 May 2020 10:31:18 +0300
Predating behavior of the Laughing falcon (Herpetotheres cachinnans) on the venomous Amazonian pit viper Bothrops atrox (the use of roads as a prey source) https://biorisk.pensoft.net/article/35953/ BioRisk 14: 25-30

DOI: 10.3897/biorisk.14.35953

Authors: Pablo Medrano-Vizcaíno

Abstract: Aspects about the feeding behavior of the Laughing falcon (Herpetotheres cachinnans)article remain poorly investigated with scarce reports of identified species ingested by this bird. Worse still, information describing how this bird ingests poisonous snakes is not known. Although this falcon eats snakes, there are no reports of feeding on Bothrops atrox. In this work, I describe this predation event and analyze how roads seem to be a potential hunting strategy that H. cachinnans exploit to prey on snakes.

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Short Communication Tue, 2 Jul 2019 09:53:43 +0300
What about biological corridors? A review on some problems of concepts and their management https://biorisk.pensoft.net/article/32682/ BioRisk 14: 15-24

DOI: 10.3897/biorisk.14.32682

Authors: Roberto Moreno, Claudia Jimena Guerrero-Jimenez

Abstract: Natural ecosystems are increasingly being affected by climate change and fragmentation, which have a strong impact on biodiversity thus affecting habitats and species diversity of flora and fauna at all levels. As a response to this situation the idea of biological corridors was developed. This review relates the problems associated with the main concepts and definitions of the biological corridors, seeking to highlight the advantages of this tool and describing its potential applicability, and showing the importance of the biological corridors as a solution to improve the conservation of species and so as to support sustainable development in areas of high biodiversity. Examples of biological corridors in several countries are cited and its application guidelines and conservation benefits are described. In conclusion, the need to improve information on habitat and its association with wild species is highlighted through adaptive forestry that is part of a comprehensive management of forest ecosystems. In addition, it is important to monitor the effects of corridors implemented in a feedback process that allows a greater analysis and evaluation of the overall positive effects of their implementation. Finally, some management actions are proposed to improve the conservation of ecosystems.

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Review Article Tue, 4 Jun 2019 13:41:23 +0300
Impact of hydromorphological pressures on the macrophytes bioindicators of the ecological water quality in Mediterranean rivers https://biorisk.pensoft.net/article/30319/ BioRisk 14: 1-14

DOI: 10.3897/biorisk.14.30319

Authors: Maissour Abdellah, Benamar Saad

Abstract: One of the important tools to evaluate the ecological quality of surface water is the Macrophytes indices based on the bioindication capacity of aquatic plants. In Mediterranean rivers (France, Spain, and Portugal), the development of some macrophytes indices like l’Indice Biologique Macrophytes Rivières (IBMR), the biological metric score (BMS), as well as the Fluvial Macrophyte Index (IMF) are founded on the determination of the indicator values of the floristic reference lists. The aim of this study was to test the impact of the eco-Mediterranean differences (from one country to another) on the indicator taxa by comparing the indicator values of the Euro‐ Mediterranean macrophyte indices. With this in mind, we explore the possibility of the introduction of the Euro‐Mediterranean macrophytes-based indices in Morocco (i.e. the hydrological basin of Sebou (HBS)) as a part of a preliminary attempt to develop the first Afro-Mediterranean macrophyte index. We confirm that the ecological amplitude and species optima vary between Mediterranean ecoregions, and indicator taxa differ between countries: There are medium to small correlations between Mediterranean indices: IBMR/BMS (p = 0.000, R2 = 0.57), IMF/BMS (p = 0.000, R2 = 0.34), and IBMR/IMF (p = 0.000, R2 = 0.30). Five species exhibit major differences in indicator values: Zannichellia palustris and Potamogeton pectinatus have more eutrophic indicator values in France (IBMR) than in Spain (IMF). Potamogeton nodosus, Amblystegium riparium and Lycopus europaeus have broader ecological amplitudes in Portugal (BMS) than in France (IBMR) and in Spain (IMF), where it is restricted to eutrophic conditions. Furthermore, the three indicator systems include different indicator-taxon numbers. The comparison of the HBS elaborated list with the Euro‐Mediterranean indices revealed the low level of common taxa approximately 6.76% of all indicator species used in the French index (IBMR), 10.48% in the Portuguese index (IMF) and 12.38% in the Spanish index (BMS). These results show the inadequacy of the trophic indices approach with the HBS conditions and thus the need for the development of an index based on biotic indices approach.

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Research Article Thu, 9 May 2019 10:42:55 +0300
Invasion stages and potential distributions of seven exotic terrestrial isopods in Japan https://biorisk.pensoft.net/article/23514/ BioRisk 13: 53-76

DOI: 10.3897/biorisk.13.23514

Authors: Shigenori Karasawa, Kensuke Nakata

Abstract: Evaluating potential distribution areas and limiting factors for the distribution of exotic species in invasive regions are essential to identify risks and protect the native ecosystem. However, less research has been conducted on the underground ecosystem than for above-ground. Factors, limiting the distributions of exotic terrestrial isopods, have been identified and their invasive stages and potential distribution areas in Japan evaluated. A database of distribution data has been developed for 17,412 terrestrial isopod specimens in Japan and two ecological niche models constructed using 19 bioclimatic variables; the regional model was calculated using data from Japan (invasive region) only, whereas a combination of data from Japan and North America (invasive regions) and Europe (native region) was used to construct the global model. The global model predicted that annual mean temperature and mean diurnal-temperature range were the important limiting factors for most exotic isopods. It was found that Armadillidium nasatum Budde-Lund, 1833, A. vulgare Latreille, 1804, Haplophthalmus danicus Budde-Lund, 1880, Porcellio laevis Latreille, 1804, P. scaber Latreille, 1804 and Porcellionides pruinosus (Brandt, 1833) were composed of stabilising and colonising populations, which enabled prediction of the future spread of distribution areas for these species in Japan. Porcellio dilatatus Brandt, 1833 was introduced in unstable environments and thus was found in fewer locations.

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Research Article Thu, 15 Mar 2018 10:47:35 +0200
Spatial analysis of the occurrence of protected butterflies in six European biogeographic regions as a tool for the environmental risk assessment of Bt maize https://biorisk.pensoft.net/article/20688/ BioRisk 13: 31-52

DOI: 10.3897/biorisk.13.20688

Authors: Dolezel Marion, Bartel Andreas, Heissenberger Andreas

Abstract: In the environmental risk assessment (ERA) of genetically modified plants (GMP), the consideration of the different environments where genetically modified plants (GMP) will be commercially grown (the receiving environments) plays a crucial role. In addition, relevant protection goals which may be adversely affected by the GMP have to be considered during the ERA. Using a literature- and GIS-based approach, distribution data of protected lepidopteran species listed in Council Directive 92/43/EEC and of maize cultivation was used in order to evaluate potential spatial overlaps between GM maize and protected non-target Lepidoptera in different biogeographical regions (BGR) of the EU. Each BGR has its peculiarity regarding maize cultivation and the distribution of protected butterflies. The lepidopteran fauna of the Pannonian BGR is particularly sensitive due to large maize cultivation shares and wide distribution of protected butterflies within this BGR. For the BGRs evaluated potential, spatial exposures of protected butterflies to GM maize cannot be excluded. This study shows that the suggested approach is a useful tool for the consideration of EU-wide protected species in different receiving environments during the problem formulation of the ERA of GMPs.

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Research Article Wed, 21 Feb 2018 13:18:07 +0200
Insect hibernation on urban green land: a winter-adapted mowing regime as a management tool for insect conservation https://biorisk.pensoft.net/article/22316/ BioRisk 13: 1-29

DOI: 10.3897/biorisk.13.22316

Authors: Philipp Andreas Unterweger, Jorinde Klammer, Manuela Unger, Oliver Betz

Abstract: Insect conservation is challenging on various ecological scales. One largely neglected aspect is the quality of undisturbed hibernation sites. This study aims to fill a lack of knowledge concerning insect hibernation on uncut meadows persisting in urban green spaces during the winter season in a middle-sized town in south Germany. During two years of sampling, 13,511 insect specimens of the orders Heteroptera, Hymenoptera, Coleoptera and Diptera were caught from their winter stands. The specimens were assigned to 120 families and 140 taxonomic species were determined from the orders Heteroptera, Coleoptera and Diptera and 324 morphotypes from the orders Hymenoptera, Coleoptera and Diptera. The data indicate the importance of winter fallows for insect hibernation. Unmown meadows offer additional plant structures in winter (flower heads, stems, tufts and leaves) that are absent from mown ones. This increased structural diversity results in both higher species diversity and numbers of insect individuals during spring emergence. The results of this study thus emphasise the value of unmown structures for insect conservation and suggest a mosaic-like cutting maintenance of meadows, way- and river-sides and other green infrastructure in both the urban area and the open landscape.

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Research Article Fri, 12 Jan 2018 14:14:23 +0200
Elucidating food plants of the aggregative, synchronously flashing Southeast Asian firefly, Pteroptyx tener Olivier (Coleoptera, Lampyridae) https://biorisk.pensoft.net/article/14061/ BioRisk 12: 25-39

DOI: 10.3897/biorisk.12.14061

Authors: Shawn Cheng, Kar-Men Chan, Shah-Fadir Ishak, V. Khoo, M.Y. Chew

Abstract: The aggregative, synchronously flashing firefly, Pteroptyx tener congregates on a nightly basis on Berembang trees (Sonneratia caseolaris) growing along the lower reaches of the Selangor River (West Malaysia). Every night, the males and females of this species engage one another in a pre-mating ritual of flash communication. Little is known of the dietary requirements of the adults of P. tener apart from suggestions that these beetles feed on the nectar and sap of mangrove trees. The drastic reduction in their numbers in recent years has sparked an urgency to understand their dietary needs. Here, we report on a series of probing experiments where we sequenced and analysed DNA fragments obtained from the gut contents of adult P. tener specimens. We detected coding and non-coding chloroplast DNA (cpDNA) gene sequences in the gut DNA extracts of P. tener. One DNA sequence was in reasonably good condition to allow us to match it to the cpDNA sequence of a Malvacean, that is, Heritiera littoralis, a common inhabitant of estuarine habitats. We also detected the DNA sequences of plants (cultivated and natural) that may have come from hamlets or isolated freshwater swamps located further inland. The findings reported here provide early indication that P. tener may be able to travel further inland to search for their hosts. Future research should focus on visually confirming if P. tener feeds on H. littoralis and obtaining a more complete reference DNA database of plants in the firefly habitat.

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Research Article Thu, 17 Aug 2017 13:32:53 +0300
Global Trends in Biorisk Management https://biorisk.pensoft.net/article/12156/ BioRisk 12: 1-23

DOI: 10.3897/biorisk.12.12156

Authors: Sreenivas Reddy Bathula, A. Rakhimol

Abstract: This report recapitulates the diverse aspects of biological safety. Biological laboratory is a space that facilitates the handling and storage of microorganisms, their components or their derivatives. Laboratories that handle dangerous pathogens have to act in a responsible manner to manage the safety and security threats posed by these pathogens. This necessity was foreground in the December 2008 World at risk report, which specifically demanded bioscience laboratories that handle dangerous pathogens to implement a unified laboratory biorisk management framework to enhance their safety and security. The report also discusses the guidelines of biosafety regulations provided by World Health Organization (WHO) that are necessary to adequately and sustainably manage these biorisks and helps in better understanding of risk governance approaches for laboratories that handle dangerous pathogens to achieve the ultimate goal of minimizing or preventing the occurrence and consequences of human error within the laboratory environment: the biorisk management approach, composed of biosafety, laboratory biosecurity and ethical responsibility. It preferably provides an agreement between authorities, the public, and the scientific community establishing trust and societal safety and security, while enabling the continued progress of science. Biorisk management approach demonstrates that biorisks in all their potential forms are appropriately addressed, managed and minimized. Thus, biorisk management has become an important aspect of the development and sustainability of biological activities.

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Review Article Fri, 14 Jul 2017 08:47:12 +0300
Killer Conservation: the implications of disease on gorilla conservation https://biorisk.pensoft.net/article/9941/ BioRisk 11: 1-11

DOI: 10.3897/biorisk.11.9941

Authors: Rhiannon Schultz

Abstract: Human intrigue with the natural world has led to a boom in nature-oriented ecotourism and research endeavors. Some of these projects and programs focus on viewing or studying endangered wildlife, but can have negative implications on wild animal health. Human contact with sensitive habitat and wildlife presents a unique opportunity for the transmission of interspecies disease, which can have traumatic effects on the conservation of endangered species. Nonhuman primates have a relatively high risk of contracting disease from visiting tourists and researchers due to their genetic similarity to humans. Local people living in and around sensitive habitats also pose a potential threat of disease transmission. There are some protocols in place to help alleviate interspecies disease transmission, but many of these protocols are centered on protecting humans rather than nonhuman primates. Using Mountain gorillas as an example, this paper examines the literature and research regarding Mountain gorilla health and welfare in the wild. Drawing on the possible shortcomings of current protocols and the potential health risks of these issues, this paper suggests some avenues for further research and pushes for the development of stronger methods for preventing interspecies disease transmission.

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Research Article Tue, 4 Oct 2016 17:00:34 +0300
Climatic Risk and Distribution Atlas of European Bumblebees https://biorisk.pensoft.net/article/4749/ BioRisk 10: 1-236

DOI: 10.3897/biorisk.10.4749

Authors: Pierre Rasmont, Markus Franzén, Thomas Lecocq, Alexander Harpke, Stuart Roberts, Jacobus C. Biesmeijer, Leopoldo Castro, Björn Cederberg, Libor Dvorak, Úna Fitzpatrick, Yves Gonseth, Eric Haubruge, Gilles Mahé, Aulo Manino, Denis Michez, Johann Neumayer, Frode Ødegaard, Juho Paukkunen, Tadeusz Pawlikowski, Simon Potts, Menno Reemer, Josef Settele, Jakub Straka, Oliver Schweiger

Abstract: Bumble bees represent one of the most important groups of pollinators. In addition to their ecological and economic relevance, they are also a highly charismatic group which can help to increase the interest of people in realizing, enjoying and conserving natural systems. However, like most animals, bum- ble bees are sensitive to climate. In this atlas, maps depicting potential risks of climate change for bumble bees are shown together with informative summary statistics, ecological back- ground information and a picture of each European species. Thanks to the EU FP7 project STEP, the authors gathered over one million bumblebee records from all over Europe. Based on these data, they modelled the current climatic niche for almost all European species (56 species) and projected future climatically suitable conditions using three climate change scenarios for the years 2050 and 2100. While under a moderate change scenario only 3 species are projected to be at the verge of extinction by 2100, 14 species are at high risk under an intermediate change scenario. Under a most severe change scenario as many as 25 species are projected to lose almost all of their climatically suitable area, while a total of 53 species (77% of the 69 European species) would lose the main part of their suitable area. Climatic risks for bumblebees can be extremely high, depending on the future development of human society, and the corresponding effects on the climate. Strong mitigation strategies are needed to preserve this important species group and to ensure the sustainable provision of pollination services, to which they considerably contribute.

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Monograph Wed, 18 Feb 2015 12:24:29 +0200
China in the anthropocene: Culprit, victim or last best hope for a global ecological civilisation? https://biorisk.pensoft.net/article/1904/ BioRisk 9: 1-37

DOI: 10.3897/biorisk.9.6105

Authors: Joachim Spangenberg

Abstract: The anthropocene is the age where human influences are determining the development of the planet’s ecosystems and thus the bio-physical basis of future human civilisations. Today China has become the world’s largest economy and its worst polluter with per capita greenhouse gas emissions surpassing the EU average, the world’s largest consumer of all kinds of resources. Even regarding the aggregate contribution to climate change (historical emission residues included), called the climate debt, China has not yet, but will be most probably climbing the top position rather soon.At the same time China is the world’s largest victim of environmental change, including air and soil pollution, water and land scarcity, biodiversity loss and climate change.Thus not only slowing down the increase but reducing emissions should be a top priority for China, and it is: the government has taken some bold steps. China is the world’s largest investor in renewable energies, has the largest afforestation program, and leads the world in reducing carbon dioxide emission reduction. As the largest polluter it has extraordinary opportunities to improve the global state of the environment – is it the world’s last best hope for establishing a global ecological civilisation? Some implications regarding the Chinese environmental policy are discussed, some strengths highlighted and some weaknesses identified.However, despite their magnitude, the efforts–and in particular their implementation–are not yet sufficient. We suggest three additional steps which could help China to begin reducing its climate debt within a couple of decades, define a long term perspective for policy planning and adjust its growth model to the challenges of the anthropocene.

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Research Article Tue, 10 Jun 2014 00:00:00 +0300
Supporting monitoring effects of genetically modified organisms by GIS-technologies and geodata – an overview https://biorisk.pensoft.net/article/1896/ BioRisk 8: 111-120

DOI: 10.3897/biorisk.8.4038

Authors: Winfried Schroeder, Gunther Schmidt

Abstract: The approval of genetically modified organisms for deliberate release and placing on the market requires environmental risk assessment and environmental monitoring. Methodological approaches and implementation of both tasks are still controversially discussed. This article analyses principles of environmental monitoring of genetically modified organisms as published in the Guideline 4330 Part 1 of the Association of German Engineers. Thereby, the article concentrates on the characterisation of the receiving environment affected by cultivation of genetically modified organisms and the representativeness of monitoring systems to assess large-scale implications of the cultivation of genetically modified organisms. Based on this, the article introduces statistical and geoinformatic measures as well as relevant geodata to deal with these issues.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
How to track genetically modified (GM) plants in the field? The VDI standard method of floristic mapping of GM plants as an efficient tool https://biorisk.pensoft.net/article/1897/ BioRisk 8: 89-110

DOI: 10.3897/biorisk.8.4035

Authors: Ulrich Sukopp, Ulf Schmitz

Abstract: The commercial use of genetically modified (GM) organisms is regulated in the EU by law. Thus, monitoring the environmental effects of GM organisms after placement on the market is a mandatory task of the respective consent holder. Since many relevant monitoring procedures lack standardisation, the Association of German Engineers (VDI) has commissioned expert groups with the development of guidelines covering appropriate methodologies. As part of this project, the VDI Guideline 4330 Part 10 was set up (Bleeker et al. 2011) describing a standardised procedure for floristic mapping of spontaneously occurring (non-cultivated) GM crops, their wild potential crossing partners and their hybrid offspring. Areas to be mapped are those where such plants are expected to be found, e.g. on former fields and in the vicinity of current or former fields of GM plants. In the case of transportation, processing or use of GM plants as animal feed, these are areas surrounding the processing, storage, handling and usage facilities, including access routes to and from the facilities. The concept of adverse environmental effects caused by the dispersal and outcrossing of GM plants is briefly introduced. The necessity of floristic mapping in the context of post-market environmental monitoring of GM plants is demonstrated taking oilseed rape as an example. The development of the Guideline VDI 4330 Part 10 is described and its contents are summarised. An important conclusion on the relevance and efficiency of the floristic mapping method is that strict standardisation ensures a high level of EU wide reproducibility and comparability of the results.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
Soil organisms as an essential element of a monitoring plan to identify the effects of GMO cultivation. Requirements – Methodology – Standardisation https://biorisk.pensoft.net/article/1898/ BioRisk 8: 73-87

DOI: 10.3897/biorisk.8.3255

Authors: Andrea Ruf, Anneke Beylich, Theo Blick, Wolfgang Buechs, Frank Glante, Sebastian Hoess, Martina Roß-Nikoll, Liliane Ruess, David J. Russell, Jörg Römke, Heike Seitz, Bernhard Theißen, Andreas Toschki, Cathrin Weinmann, Wiebke Zueghart

Abstract: After a release of genetically modified organisms, monitoring of potential adverse effects on the environment is mandatory. The protocol used for monitoring should be previously tested in practical studies and must be standardised. Moreover, sampling methods and the evaluation of results must meet current scientific and technical standards. Due to their particular role in maintaining soil quality and in a multitude of ecological processes in agro-ecosystems, soil organisms belong to those groups for which VDI guidelines are being developed. The guideline 4331 Part 1 describes fundamental criteria for the selection and sampling of soil organisms for GMO monitoring and gives guidance for sampling design, sampling strategy and statistical evaluation. In the guideline three approaches are followed: (1) a compilation of previously known effects and exposure pathways, (2) a documentation of ecological functions of soil organisms (ecosystem services) as well as (3) a description of characteristic species compositions in the soil. The aim was to develop a selection matrix that helps to choose the appropriate animal groups to be sampled. Besides the habitat type and the ecological relevance, the selection matrix also considers the suitability of animal groups in terms of practical issues and, in specific cases, anticipated effects. Further parts of the guideline 4331 will describe sampling methods for relevant soil animal groups.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
Monitoring agricultural ecosystems by using wild bees as environmental indicators https://biorisk.pensoft.net/article/1899/ BioRisk 8: 53-71

DOI: 10.3897/biorisk.8.3600

Authors: Matthias Schindler, Olaf Diestelhorst, Stephan Haertel, Christoph Saure, Arno Scharnowski, Hans. R. Schwenninger

Abstract: Wild bees are abundant in agricultural ecosystems and contribute significantly to the pollination of many crops. The specialisation of many wild bees on particular nesting sites and food resources makes them sensitive to changing habitat conditions. Therefore wild bees are important indicators for environmental impact assessments. Long-term monitoring schemes to measure changes of wild bee communities in agricultural ecosystems are currently lacking. Here we suggest a highly standardized monitoring approach which combines transect walks and pan traps (bowls). The combination of these two methods provides high sample coverage and reveals data on plant-pollinator interactions. We point out that comprehensive methodical, biological and taxonomical expertise is mandatory. The suggested approach is applicable to diverse monitoring goals in an agricultural context e.g. the impact of land use changes as well as monitoring potential effects of GM crops on wild bees.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
Amphibians as indicators of changes in aquatic and terrestrial ecosystems following GM crop cultivation: a monitoring guideline https://biorisk.pensoft.net/article/1900/ BioRisk 8: 39-51

DOI: 10.3897/biorisk.8.3251

Authors: Susanne Böll, Benedikt Schmidt, Michael Veith, Norman Wagner, Dennis Rödder, Cathrin Weinmann, Tom Kirschey, Stefan Loetters

Abstract: Amphibians are a suitable indicator group for monitoring possible negative direct or indirect effects of GMO cultivation at the individual and population level. Direct effects could occur in aquatic ecosystems via uptake of GM pollen or GM detritus by anuran larvae. However, indirect negative effects caused by changes in cultivation practices (changes in pesticide use, for instance) are more likely. The VDI Guideline 4333 aims to ensure comprehensive monitoring of the different life-stages of anuran species that are common in agricultural landscapes of Austria, Germany and Switzerland. The guideline includes a novel approach to tadpole monitoring. To assess immediate effects, tadpole, metamorph and adult deformation rates are compared with naturally occurring deformation rates. Adult population size, adult body condition and juvenile emergence are monitored over multiple years to assess long-term effects of GM crop cultivation on population viability. At each study site, monitoring has to be carried out at multiple amphibian breeding sites which differ in their exposure to GM crop cultivation. All monitoring data have to be stored in a central database for future meta-analyses. This will ultimately allow for generalized statements about the impact of GM crop cultivation on amphibians. Although specifically designed for GM crops, VDI Guideline 4333 may also serve as a model for studying the effects of a wider range of stressors on amphibian populations in agriculture and forestry.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
Standardised methods for the GMO monitoring of butterflies and moths: the whys and hows https://biorisk.pensoft.net/article/1901/ BioRisk 8: 15-38

DOI: 10.3897/biorisk.8.3244

Authors: Andreas Lang, Bernhard Theißen, Matthias Dolek

Abstract: Butterflies and moths (Lepidoptera) are correlated with many biotic and abiotic characteristics of the environment, and are widely accepted as relevant protection goals. Adverse effects on butterflies and moths through genetically modified (GM) crops have been demonstrated, by both insect-resistant and herbicide-tolerant events. Thus, Lepidoptera are considered suitable bio-indicators for monitoring the potential adverse effects due to the cultivation of GM crops, and guidelines were developed under the umbrella of the Association of German Engineers VDI (Verein Deutscher Ingenieure), entitled “Monitoring the effects of genetically modified organisms (GMO) – Standardised monitoring of butterflies and moths (Lepidoptera): transect method, light trap and larval survey”. Here, the background and rationale of the VDI guidelines is presented, including a summary of the methods described in the guidelines. Special emphasis is given to the discussion of underlying reasons for the selection and adjustment of the applied methodology with respect to the GMO monitoring of day-active Lepidoptera, of night-active moths and of the recording of lepidopteran larvae, as well as to sample design and strategy. Further aspects possibly interfering with monitoring quality are treated such as landscape patterns, low species number and abundance in agro-ecosystems, or high year-to-year fluctuations of populations of Lepidoptera. Though specifically designed for GM crops, the VDI guidelines may also serve as a template to monitor the effects of a wider range of adverse factors on Lepidoptera in agriculture.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
Tools for a scientifically rigorous and efficient monitoring of genetically modified organisms (GMOs) – VDI Guidelines to ensure high quality of GMO-monitoring data https://biorisk.pensoft.net/article/1902/ BioRisk 8: 3-13

DOI: 10.3897/biorisk.8.4036

Authors: Wiebke Zueghart, Heike Beismann, Winfried Schroeder

Abstract: The deliberate release of genetically modified organisms (GMOs) implies the potential occurrence of environmental impacts which are either unexpected or only partially predictable and, thus, necessitates development of appropriate monitoring methodology. Therefore, new challenges have to be met when implementing the post market environmental monitoring (PMEM) of genetically modified organisms (GMOs), which is mandatory according to the European legal framework. According to Directive 2001/18/EC PMEM has to follow standard methodologies, wherever available and appropriate. To provide all involved parties with appropriate standard monitoring methods, the so called VDI Guidelines are developed by working groups established by the Association of German Engineers (VDI). These working groups are composed by external experts participating on a voluntary basis. The VDI is an independent technical standardisation body. All Guidelines are published in German and English and can therefore be used throughout Europe. VDI Guidelines are available in the field of exposure of the environment to GM plants (e.g. standardised sampling of pollen, standardised observation of hybrids or ferals), bio-molecular analyses (e.g. standardised extraction and detection of transgenes or their products in different environmental compartments), and the standardised monitoring of effects on non-target organisms (e.g. butterflies, wild bees, amphibians or soil organisms). The aim beyond this work is to facilitate generation of reliable and comparable monitoring data and enable an effective and efficient PMEM with high acceptability to the scientific community as well as the general public.

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Research Article Thu, 8 Aug 2013 00:00:00 +0300
GMO environmental impact monitoring https://biorisk.pensoft.net/article/1903/ BioRisk 8: 1-2

DOI: 10.3897/biorisk.8.5949

Authors: Josef Settele, Wiebke Zueghart

Abstract:

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Editorial Thu, 8 Aug 2013 00:00:00 +0300
Riparian habitat assessment tool for Lebanese rivers (RiHAT): case study Ibrahim River https://biorisk.pensoft.net/article/1891/ BioRisk 7: 99-116

DOI: 10.3897/biorisk.7.1331

Authors: Maya Abboud, Jala Makhzoumi, C. Clubbe, R. Zurayk, S. Jury, S. N. Talhouk

Abstract: Biodiversity conservation in Lebanon ought to be guided by practical assessment tools in order to promote conservation efforts amid destructive and profit driven urban and industrial expansion. The challenge for national conservation scientists, however, is to develop such tools while reconciling between scientific ‘rigor’ and pressing national realities. Those include rapid habitat loss, limited human and financial resources, and the fact that biodiversity is a low national priority compared to other social, political, and economic issues. It is in this context that we propose a rapid management strategy guide based on a habitat assessment tool for riparian ecosystems (which are typically threatened in Lebanon). The proposed riparian habitat assessment tool (RiHAT) consists of a habitat condition index based on twelve indicators grouped under two attributes, floristic and lndscape.

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Research Article Wed, 17 Oct 2012 00:00:00 +0300
A framework for a European network for a systematic environmental impact assessment of genetically modified organisms (GMO) https://biorisk.pensoft.net/article/1892/ BioRisk 7: 73-97

DOI: 10.3897/biorisk.7.1969

Authors: Frieder Graef, Joerg Roembke, Rosa Binimelis, Anne I. Myhr, Angelika Hilbeck, Broder Breckling, Tommy Dalgaard, Ulrich Stachow, Georgina V. Catacora, Thomas Bøhn, David Quist, Béla Darvas, Gert Dudel, Bernadette Oehen, Hartmut Meyer, Klaus Henle, Brian Wynne, Marc Metzger, Silvio Knäbe, Josef Settele, András Székács, Angelika Wurbs, Jeannette Bernard, Donal Murphy-Bokern, Marcello Buiatti, Manuela Giovannetti, Marko Debeljak, Erling Andersen, Andreas Paetz, Saso Dzeroski, Beatrix Tappeser, Cornelis A.M. van Gestel, Werner Wosniok, Gilles-Eric Séralini, Iulie Aslaksen, Roland Pesch, Stanislav Maly, Armin Werner

Abstract: The assessment of the impacts of growing genetically modified (GM) crops remains a major political and scientific challenge in Europe. Concerns have been raised by the evidence of adverse and unexpected environmental effects and differing opinions on the outcomes of environmental risk assessments (ERA). The current regulatory system is hampered by insufficiently developed methods for GM crop safety testing and introduction studies. Improvement to the regulatory system needs to address the lack of well designed GM crop monitoring frameworks, professional and financial conflicts of interest within the ERA research and testing community, weaknesses in consideration of stakeholder interests and specific regional conditions, and the lack of comprehensive assessments that address the environmental and socio-economic risk assessment interface. To address these challenges, we propose a European Network for systematic GMO impact assessment (ENSyGMO) with the aim directly to enhance ERA and post-market environmental monitoring (PMEM) of GM crops, to harmonize and ultimately secure the long-term socio-political impact of the ERA process and the PMEM in the EU. These goals would be achieved with a multi-dimensional and multi-sector approach to GM crop impact assessment, targeting the variability and complexity of the EU agro-environment and the relationship with relevant socio-economic factors. Specifically, we propose to develop and apply methodologies for both indicator and field site selection for GM crop ERA and PMEM, embedded in an EU-wide typology of agro-environments. These methodologies should be applied in a pan-European field testing network using GM crops. The design of the field experiments and the sampling methodology at these field sites should follow specific hypotheses on GM crop effects and use state-of-the art sampling, statistics and modelling approaches. To address public concerns and create confidence in the ENSyGMO results, actors with relevant specialist knowledge from various sectors should be involved.

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Research Article Wed, 17 Oct 2012 00:00:00 +0300
Stand age characteristics and soil properties affect species composition of vascular plants in short rotation coppice plantations https://biorisk.pensoft.net/article/1893/ BioRisk 7: 51-71

DOI: 10.3897/biorisk.7.2699

Authors: Sarah Baum, Martin Weih, Andreas Bolte

Abstract: Woody biomass plantations on agricultural sites are an attractive source of biomass for bioenergy, but their effects on local biodiversity are unclear. This study’s objective was to evaluate the influences of light availability, plantation age, and soil properties on phytodiversity in short rotation coppice (SRC) plantations. Ground vegetation mapping, irradiance measurement (PAR), and surface soil analyses were conducted in 15 willow and poplar SRC plantations in Central Sweden and Northern Germany. We performed different multivariate statistical methods like cluster analysis (CA), principal component analysis (PCA), and canonical correspondence analysis (CCA) in order to analyze species composition and the influence of irradiance, age, and soil properties on phytodiversity. CA revealed highest species composition similarities in SRC plantations in close proximity. PCA identified humus quality/essential plant nutrients, plantation age/irradiance effects, soil acidity and shoot age as the four principal components of the recorded parameters. The ground vegetation cover was negatively correlated with the plantation age component and positively with the nutrient component. With an increase in the plantation age component, a shift in species composition was proven towards more forest habitat species, more nutrient-demanding species, and increasing occurrence of indicator species for basic soils. Applying Ellenberg indicator values, basic soil indicator species corresponded in occurrence to increasing nutrient availability. However, species richness was not related to any of our studied site variables. Judged from CCA, species composition in SRC plantations was influenced by plantation age/irradiance, and nutrient availability; soil acidity and shoot age had no significant influence. Young poplar and willow SRC plantations showed greatest variation in photosynthetically active radiation (PAR). Our findings suggest that phytodiversity in SRC plantations depends mainly on plantation age and thus shifts over time.

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Research Article Wed, 17 Oct 2012 00:00:00 +0300
Bioenergy from “surplus” land: environmental and socio-economic implications https://biorisk.pensoft.net/article/1894/ BioRisk 7: 5-50

DOI: 10.3897/biorisk.7.3036

Authors: Jens Dauber, Chris Brown, Ana Luisa Fernando, John Finnan, Ewa Krasuska, Jens Ponitka, David Styles, Daniela Thrän, Kees Jan Van Groenigen, Martin Weih, Rainer Zah

Abstract: The increasing demand for biomass for the production of bioenergy is generating land-use conflicts. These conflicts might be solved through spatial segregation of food/feed and energy producing areas by continuing producing food on established and productive agricultural land while growing dedicated energy crops on so called “surplus” land. Ambiguity in the definition and characterization of surplus land as well as uncertainty in assessments of land availability and of future bioenergy potentials is causing confusion about the prospects and the environmental and socio-economic implications of bioenergy development in those areas. The high level of uncertainty is due to environmental, economic and social constraints not yet taken into account and to the potentials offered by those novel crops and their production methods not being fully exploited. This paper provides a scientific background in support of a reassessment of land available for bioenergy production by clarifying the terminology, identifying constraints and options for an efficient bioenergy-use of surplus land and providing policy recommendations for resolving conflicting land-use demands. A serious approach to factoring in the constraints, combined with creativity in utilizing the options provided, in our opinion, would lead to a more sustainable and efficient development of the bioenergy sector. Unless the sustainability challenge is mastered, the interdependent policy objectives of mitigating climate change, obtaining independence from fossil fuels, feeding and fuelling a growing human world population and maintaining biodiversity and ecosystem services will not be met. Despite the advanced developments of bioenergy, we still see regional solutions for designing and establishing sustainable bioenergy production systems with optimized production resulting in social, economic and ecological benefits. Where bioenergy production has been identified as the most suitable option to overcome the given problems of energy security and climate change mitigation, we need to determine which bioenergy cultivation systems are most suitable for the respective types of surplus land, by taking into account issues such as yields, inputs and costs, as well as potential environmental and socio-economic impacts.

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Review Article Wed, 17 Oct 2012 00:00:00 +0300
Shedding light on the biodiversity and ecosystem impacts of modern land use. https://biorisk.pensoft.net/article/1895/ BioRisk 7: 1-4

DOI: 10.3897/biorisk.7.4077

Authors: Jens Dauber, Josef Settele

Abstract: none

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Editorial Wed, 17 Oct 2012 00:00:00 +0300
A strategy for conservation and investigation of the protected resurrection plant Haberlea rhodopensis Friv. https://biorisk.pensoft.net/article/1888/ BioRisk 6: 41-60

DOI: 10.3897/biorisk.6.1568

Authors: Evelina Daskalova, Slaveya Dontcheva, Galina Yahoubian, Ivan Minkov, Valentina Toneva

Abstract: Representatives of the resurrection plants from Gesneriaceae family are included in the Red Book of Bulgaria, in the European Register of rare, endangered, and endemic plants, and are subjects of world’s conventions on the preservation of the biodiversity. The unique feature of these plants to recover from prolonged dehydration (anabiosis) is explored in numerous studies. These species are also Tertiary relics, so they could give us important knowledge about plant evolution.Our research group at the University of Plovdiv has established a national in vitro gene bank for Haberlea rhodopensis Friv. (25 localities) and Ramonda serbica Panc. (2 localities) from Bulgaria. The national gene bank is based on original and modified in vitro technologies and can serve as a conservation and biodiversity investigation center for the family Gesneriaceae.Basing on our work with Haberlea rhodopensis Friv., we are developing a strategy for conservation and investigation of rare and relic plant species (mapping and exploration of habitats – assessing the local risk of extinction - introducing in an in vitro gene bank - model plants for research – adaptation and possible re-introduction in endangered habitats). This strategy can be adapted and used for conservation and investigation of other rare, protected, relic and endemic plants from other regions of Europe and worldwide.

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Research Article Mon, 19 Dec 2011 00:00:00 +0200
Assessing the potential risks of transgenic plants for non-target invertebrates in Europe: a review of classification approaches of the receiving environment https://biorisk.pensoft.net/article/1889/ BioRisk 6: 19-40

DOI: 10.3897/biorisk.6.1334

Authors: Stephan Jänsch, Jörg Römbke, Angelika Hilbeck, Gabriele Weiß, Hanka Teichmann, Beatrix Tappeser

Abstract: According to the current legal background for the regulation of genetically modified plants (GMPs) in Europe, an environmental risk assessment (ERA) has to be performed considering i) the crop plant, ii) the novel trait relating to its intended effect and phenotypic characteristics of the GM crop plant and iii) the receiving environment related to the intended use of the GMP. However, the current GMP-ERA does not differentiate between different intended receiving environments. Therefore, the question is to be raised: How can the ’receiving environment’ be classified on the European scale, both in an ecologically relevant and feasible way? As a first step this proposal focuses on invertebrates in the terrestrial environmental compartment. In order to check if already existing regionalization concepts are suitable for the above raised question the following selection criteria were employed: Distribution of non-target organisms (NTOs): A suitable regionalization concept should appropriately reflect the specific characteristics of the animal and plant communities of the different receiving environments of a GMP. Therefore, such a classification should be done by an ecoregion approach, meaning that different ecoregions support different organism communities that may play a different role in supporting relevant ecosystem services. However, information on the distribution of invertebrates in Europe is not available in sufficient detail for this purpose. Hence, it is proposed to use the information about site conditions like climatic, vegetation and soil parameters, which determine the composition of invertebrate communities, for the selection of an appropriate classification concept. Size and number of geographical units: This is a trade-off between the total number of ‘receiving environments’ in Europe manageable in a regulatory context and the ecological uniformity of a single geographical unit. An intermediate size and number of geographical units should be the aim of the classification.With the ‘Indicative map of European biogeographical regions’ (IMEBR) there is an existing regionalization concept that meets many of the requirements identified above: the classification is based on parameters that also determine the distribution of invertebrate communities (i.e., the potential natural vegetation) and nine biogeographical regions represented within the 27 member states of the European (EU-27) are a manageable number for regulatory purposes. However, epigeic (living above ground) and endogeic (living below ground) faunal communities are determined by different biotic and abiotic parameters. For example, climate data is much more relevant for epigeic species than for endogeic organisms. The most important soil properties related to the distribution of endogeic organisms and plants are pH, texture, organic matter content and/or content of organic carbon, C/N ratio, and water-holding capacity. Hence, for endogeic non-target organisms there is currently no suitable regionalization concept available. For the time being, it is recommended to identify important species for testing purposes in each ecoregion with GMP cultivation by means of expert knowledge using the IMEBR for both epigeic and endogeic communities.The regionalization concept is intended to be used in the context of the ERA of GMPs for the assessment of risk for NTOs. Hence, it should be tailored for the area in the EU where GMPs are likely to be grown. The overlap between the biogeographical regions and the intended area of cultivation for a novel GMP form the different cases, each of which should undergo a specific ERA process.For example, there would be eight or nine separate potato cases for the EU-27 area, i.e. the Alpine, Atlantic, Boreal, Continental, Macaronesian, Mediterranean, Pannonian, Steppic and possibly the Black Sea biogeographical regions. For grain maize there would be five to nine separate cases, i.e. the Atlantic, Continental, Mediterranean, Pannonian, Steppic and possibly the Alpine, Black Sea, Boreal and Macaronesian biogeographical regions.

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Review Article Mon, 19 Dec 2011 00:00:00 +0200
Assessing continental-scale risks for generalist and specialist pollinating bee species under climate change https://biorisk.pensoft.net/article/1890/ BioRisk 6: 1-18

DOI: 10.3897/biorisk.6.1325

Authors: Stuart Roberts, Simon Potts, Koos Biesmeijer, Michael Kuhlmann, William Kunin, Ralf Ohlemüller

Abstract: Increased risks of extinction to populations of animals and plants under changing climate have now been demonstrated for many taxa. This study assesses the extinction risks to species within an important genus of pollinating bees (Colletes: Apidae) by estimating the expected changes in the area and isolation of suitable habitat under predicted climatic condition for 2050. Suitable habitat was defined on the basis of the presence of known forage plants as well as climatic suitability. To investigate whether ecological specialisation was linked to extinction risk we compared three species which were generalist pollen foragers on several plant families with three species which specialised on pollen from a single plant species. Both specialist and generalist species showed an increased risk of extinction with shifting climate, and this was particularly high for the most specialised species (Colletes anchusae and C. wolfi). The forage generalist C. impunctatus, which is associated with Boreo-Alpine environments, is potentially threatened through significant reduction in available climatic niche space. Including the distribution of the principal or sole pollen forage plant, when modelling the distribution of monolectic or narrowly oligolectic species, did not improve the predictive accuracy of our models as the plant species were considerably more widespread than the specialised bees associated with them.

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Research Article Mon, 19 Dec 2011 00:00:00 +0200
Dragonflies and climatic change - recent trends in Germany and Europe https://biorisk.pensoft.net/article/1887/ BioRisk 5: 253-286

DOI: 10.3897/biorisk.5.857

Authors: Jürgen Ott

Abstract: In this paper the trends of dragonfly expansions during the last decades in Germany and Europe are summarized. It is shown, that there is a general expansion of many species to the north: Mediterranean species expanded to Central and Northern Europe, whereas some African species expanded to Southern Europe, some are even new to the continent. In general this means an increase of biodiversity, but looking at the ecological effects, in the medium term a decrease can be expected for mooreland and alpine species. Dragonflies can be regarded as a good indicator group for climatic change. Already now in some areas or regions negative effects on waters bodies and their dragonfly communities can be observed and more will occur if e.g. temperature rises or precipitation decreases. The consequences for nature conservation strategies – such as the NATURA 2000 network – are outlined and the general need for monitoring programmes is emphasised.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
The local species richness of Dragonflies in mountain waterbodies: an indicator of climate warming? https://biorisk.pensoft.net/article/1886/ BioRisk 5: 243-251

DOI: 10.3897/biorisk.5.853

Authors: Beat Oertli

Abstract: With climate warming, many Odonata species are extending their geographical area. In Switzerland, as in many parts of the world, this phenomenon may lead to a regional increase in species richness. The local richness (the richness of individual waterbodies) is also expected to increase, particularly in the alpine or subalpine areas where the waterbodies are particularly species–poor. Based on the species richness recorded in 109 waterbodies scattered all across Switzerland, a model is presented here relating the local species richness (adult dragonflies) to environmental variables, including the mean annual air temperature. This model predicts a sharp increase in species richness for alpine or subalpine waterbodies, which is expected to double or even treble before the end of this century. This increase would mainly be the consequence of the immigration of eurythermal species extending their geographical range, together with potential local extinctions of the cold stenothermal species.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
Dragonfly and Damselfly (Insecta, Odonata) Distributions in Ontario, Canada: Investigating the Influence of Climate Change https://biorisk.pensoft.net/article/1885/ BioRisk 5: 225-241

DOI: 10.3897/biorisk.5.852

Authors: Christopher Beatty, Stewart Fraser, Felipe Pérez-Jvostov, Thomas Sherratt

Abstract: We analysed temperature data and odonate distribution data collected in the province of Ontario, Canada, over approximately sixty years. Analysis of temperature data from 31 weather stations collected in the years 1945–2000 showed an overall significant increase in the minimum, maximum and mean monthly temperatures; these trends were not adjusted for changes in urbanisation. Comparison of county level presence/absence data for odonates from the 1950´s and 2002 found a slight decrease in the northernmost distributions of some species, although no significant patterns were evident. Lower sampling coverage in the larger, more northerly counties in Ontario, as well as the assessment of distributions based on county records may limit the sensitivity of our approach in detecting changes in odonate species distributions over time. Future work should focus on increasing the coverage, uniformity and geographic detail of available datasets, as well as evaluating range change through testing predictions based on the ecology and biogeography of odonate species.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
Expansion of Crocothemis erythraea in Ukraine https://biorisk.pensoft.net/article/1884/ BioRisk 5: 211-223

DOI: 10.3897/biorisk.5.851

Authors: Lyudmyla Khrokalo

Abstract: A noticeable expansion of some Mediterranean species takes place in Europe during last several decades and this data are related to climatic effects clearly. The present work is a review of literature and original data on distribution of C. erythraea in Ukraine. In the beginning and middle of XX century in Ukraine the Scarlet Dragonfly was observed in southern area at Dnieper valley, in outmost southwest at Danube delta at the west of Ukraine in Transcarpathian and Forecarpathian. Next, this species was registered at the foothills of Carpathian Mountains. During last three decades C. erythraea was also recorded at the north and east (central regions, eastern, northern and northeastern areas). Since 2000 new points have been registered in Odessa, Kherson,Vinnytsya, Cherkasy, Chernihiv, Kyiv administrative regions and in Crimea.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
Anthropogenic climate change impacts on ponds: a thermal mass perspective https://biorisk.pensoft.net/article/1883/ BioRisk 5: 193-209

DOI: 10.3897/biorisk.5.849

Authors: John Matthews

Abstract: Small freshwater aquatic lentic systems (lakes and ponds) are sensitive to anthropogenic climate change through shifts in ambient air temperatures and patterns of precipitation. Shifts in air temperatures will influence lentic water temperatures through convection and by changing evaporation rates. Shifts in the timing, amount, and intensity of precipitation will alter the thermal mass of lentic systems even in the absence of detectable ambient air temperature changes. These effects are likely to be strongest in ponds (standing water bodies primarily mixed by temperature changes than by wind), for whom precipitation makes up a large component of inflows. Although historical water temperature datasets are patchy for lentic systems, thermal mass effects are likely to outweigh impacts from ambient air temperatures in most locations and may show considerable independence from those trends. Thermal mass-induced changes in water temperature will thereby alter a variety of population- and community-level processes in aquatic macroinvertebrates.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
Monitoring the effects of conservation actions in agricultural and urbanized landscapes – also useful for assessing climate change? https://biorisk.pensoft.net/article/1882/ BioRisk 5: 175-192

DOI: 10.3897/biorisk.5.848

Authors: Hansruedi Wildermuth

Abstract: Various methods for measuring the success of conservation actions and for evaluating aquatic habitats are outlined, based on quantified dragonfly monitoring. They are discussed with respect to their practicability and information value, counts of adult males and especially of exuviae yielding the most valuable results. These are presented by actual examples of mire ponds, streams, ditches and rivers from central Europe, making allowance for the dynamics of the habitats and their dragonfly community. Records of detailed data, if repeated subsequently at the same localities with the same methods, are considered a useful basis for preparation of distribution maps and for comparison of the fauna over the time. Fauna shifts in horizontal and vertical distribution over the time should be judged critically with respect to climate change as they could also be caused by anthropogenic habitat changes.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
Changes in the range of dragonflies in the Netherlands and the possible role of temperature change https://biorisk.pensoft.net/article/1881/ BioRisk 5: 155-173

DOI: 10.3897/biorisk.5.847

Authors: Tim Termaat, Vincent Kalkman, Jaap Bouwman

Abstract: The trends of 60 Dutch dragonfly species were calculated for three different periods (1980–1993, 1994–1998 and 1999–2003). Comparing period 1 and period 3 shows that 39 of these species have increased, 16 have remained stable and 5 have decreased. These results show a revival of the Dutch dragonfly fauna, after decades of ongoing decline. The species were categorized in different species groups: species with a southern distribution range, species with a northern distribution range, species of running waters, species of fenlands and species of mesotrophic lakes and bogs. The trends of these different species groups were compared with the all-species control group. As expected, a significantly higher proportion of the southern species show a positive trend than the all-species group. In the northern species group on the contrary, a significantly higher proportion of the species show a negative trend than the all-species group. Different explanations for these results are discussed, such as climate change, improved quality of certain habitats and degradation of other habitats. It is likely that the observed increase of southern species is at least partly caused by the increasing temperatures. The less positive picture of the northern species group is probably more influenced by other environmental factor than directly by climate change. Three out of six southern species which have become established since 1990 have done so during the aftermath of large invasions. It is concluded that dragonflies are well capable of using changing climate circumstances to colonise new habitats.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200
When south goes north: Mediterranean dragonflies (Odonata) conquer Flanders (North-Belgium) https://biorisk.pensoft.net/article/1880/ BioRisk 5: 141-153

DOI: 10.3897/biorisk.5.855

Authors: Geert De Knijf, Anny Anselin

Abstract: Since 1980, eight southern dragonfly species have been regularly recorded in Flanders. They show a significant increase in relative abundance, relative area as well as indications of reproduction since the beginning of the nineties, with peak occurrence mainly in the 1995–1999 period. Since 2000, numbers are lower but more species were simultaneously present. Three species, Lestes barbarus, Crocothemis erythraea and Sympetrum fonscolombii, show a combination of earlier arrival, earlier reproduction with a higher frequency and higher maximum ranges and can be considered asstable populations in Flanders. All other southern species show in general a later arrival, only one confirmed or probable reproduction and have much lower maximum ranges. Two other species, reaching their northern limit of distribution in Flanders, Erythromma viridulum and E. lindenii have clearly expanded their relative area since the eighties. Their relative abundance also increased although this shows more fluctuations.

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Research Article Thu, 30 Dec 2010 00:00:00 +0200