Environmental Concerns and the State of Aquatic Environment
Assessment of water and bottom sediment pollution with heavy metals and arsenic in the Caucasus Region of the Black Sea at the present time.
Evseeva A.I., Korablina I.V., Gevorkyan Zh.V., Katalevsky N.I., Gorgola L.G.
Abstract. The content of nine heavy metals (Fe, Mn, Zn, Cr, Cu, Pb, Cd, Hg, Ni) and arsenic in the water and bottom sediments of the North-Eastern Black Sea at the present time (2018–2019) has been estimated, and the results of this investigation are presented. The analyses of samples, collected during the multi-purpose expeditions of the Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”) in the spring – early summer and summer
– early autumn seasons, are summarized. Altogether, 204 water samples and 60 bottom sediment samples have been collected. Estimation of mass concentrations of heavy metals and arsenic has been conducted according to the methods, developed and adopted by the Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”). Pollution levels in the habitat of aquatic living resources have been assessed based on the standards for maximum allowable concentrations (MAC) of harmful substances in water bodies of fisheries importance and on the average long-term values. In some areas, subjected to the increased anthropogenic pressure, exceedance in MAC of iron, manganese, zinc, and nickel is recorded. It is shown that, at present, the revealed content of heavy metals and arsenic in the water and bottom sediments of the investigated area of the Caucasus Region of the Black Sea does not pose a threat for the aquatic living resources.
Keywords: Black Sea, marine pollution, aquatic environment, bottom sediments, heavy metals, arsenic, concentration
Specific features of the change in the statistical characteristics of the horizontal structure of the salinity field of the Azov Sea waters.
Panov B.N., Spiridonova E.O.
Abstract. The work is based on the data from 49 spring, summer and autumn oceanographic surveys carried out by the Azov-Black Sea Branch of FSBSI “VNIRO” (“AzNIIRKH”) in the Azov Sea from 2001 to 2016. As characteristics of the horizontal structure of the salinity field, the radii of the concentration region of the spatial correlation function of the field in the zonal and meridional directions in the surface and bottom horizons were calculated, as well as their ratio reflecting the prevailing direction of water exchange. The average size of meridional radii was 42 km, and for the zonal one it was equal to 46 km. It is shown that, in the surface layer, the radii are maximum in summer and minimum in spring; in the bottom layer they decrease mainly from spring to autumn. The zonal radius prevails in the surface layer of the sea, whereas the meridional one prevails in the bottom. In the trends of long-term changes in the surface layer, the sizes of the meridional radii have increased. In the bottom layer, the zonal radii were decreasing. The years of predominance of zonal radii in the structure of the salinity field were attended with a decrease in the average salinity of the sea, and the predominance of meridional radii was associated with its increase. An almost complete absence of statistically significant relationships between the characteristics of the field, both in seasonal and in average annual values, was noted.
Keywords: Azov Sea, salinity field, horizontal structure of the field, correlation function, water exchange, salinity increase
Dynamics of water quality in the Temernik River considering the toxicity levels based on the data of the biotest battery
Bakaeva E.N., Taradayko M.N., Ignatova N.A., Zaporozhtseva A.Yu.
Abstract. The urbanized section of the Temernik River (Rostov-on-Don, Southern Federal District) is subjected to anthropogenic pressure. During the investigation of water toxicity by means of the bioassay method, an obvious disadvantage of using one biotest was revealed. Recently, a biotests battery has been used. However, assessing toxicity based on only one, most sensitive biotest, is untenable. The toxicity assessment has been carried out according to the scale developed by the authors. The scale considers the results of the assessment of toxicity level according to each biotest, and classifies water quality in concordance with the classes adopted in hydrochemistry. The water quality of the Temernik River has been assessed by means of the bioassay method according to a set of practices, taking into account the toxicity levels for each of the applied biotests. The studies were carried out in 2017–2019. The cultures of Chlorella vulgaris, Raphanus sativus (phytotest), and Daphnia magna were used. The water of the Temernik River showed a wide range of toxicity from “low” toxic (2 “a” class) to “extremely” toxic (5 class). The dynamics of water quality was characterized by the increase in toxicity from 2017 to 2019. The highest degree of water toxicity was recorded at the mouth of the Temernik River, in the Don River downstream from the mouth of the Temernik River, and near the Botanical Garden of the Southern Federal University at the storage site for extracted bottom sediments. Biotest data are confirmed by the analytical data on water pollution.
Keywords: river water, biotest battery, phytotest, Chlorella vulgaris, Daphnia magna, final toxicity, toxicity level, water quality class
Biology and Ecology of Aquatic Organisms
Fisheries and Processing of Aquatic Bioresources
Advisory Board Meeting of the Aquatic Sciences and Fisheries Information System (ASFIS, FAO, 10–14.08.2020)
Bragina T.M., Kulakova E.O.
Abstract. The international information system ASFIS (Aquatic Sciences and Fisheries Information System) involves services on abstracting and indexing of publications on aquatic sciences, technology, fisheries management, and aquatic resources and environment conservation, as well as their socio-economic and legal aspects. The Annual ASFA Board Meeting (ASFA — Aquatic Sciences and Fisheries Abstracts) was held in the online format from 10 to 14 August, 2020. A wide range of issues was offered for the discussion, including the Annual FAO Secretariat Report: Partnership Agreement, progress reports of the Working and Discussion Groups, Partners' presentations, problems of the informational behavior of college students under conditions of the COVID- 19 pandemic, scientific communication during the pandemic based on the approaches and expertise of the international non-profit organization World Fish, summary of the AGROVOC Vocabulary activities (the principal controlled vocabulary of the Food and Agriculture Organization, FAO UN headquarters in Rome, Italy), as well as the issues of preparation to the ASFA 50th Anniversary in 2021.The National ASFA Partner of the Russian Federation is the Russian Research Institute of Fisheries and Oceanography (VNIRO, Moscow). The Azov- Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”) has long been one of the Russian Collaborating Centers dealing with abstracting and indexing of publications from the journal “Aquatic Bioresources & Environment” into the ASFA database with mandatory full text links to the open access e-repository OceanDocs.
Keywords: FAO, ASFA, ASFA Board Meeting, VNIRO, AzNIIRKH, databases, metadata, open access