Elena Zabotkina

Elena Zabotkina
Russian Academy of Sciences | RAS · Accounts Department

About

64
Publications
4,018
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161
Citations
Citations since 2016
31 Research Items
125 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Introduction
Skills and Expertise

Publications

Publications (64)
Article
The distribution of virioplankton, abundance and production, frequency of visibly infected cells of heterotrophic bacteria and autotrophic picocyanobacteria and their virus-induced mortality have been studied in mesotrophic and eutrophic reservoirs of the Upper and Middle Volga (Ivankovo, Uglich, Rybinsk, Gorky, Cheboksary, and Sheksna reservoirs)....
Article
The distribution of viruses and their impact on prokaryotes were studied using the epifluorescence and transmission electron microscopy along a transect, located at 130°E from the area adjacent to the Lena River delta next to the shelf area, the continental slope area and the deep-sea regions of the Laptev Sea in September 2015. The abundance of pl...
Article
Full-text available
The data on Electronic Programmable Complex Fish-protecting facility of electric principle (EP EPRCFF) impact on gonads and gametogenesis of four abundant carp species (Cyprinidae) is given. Based on cytological and histological analysis of gonads from electro-treated fishes, an estimate of fishes’ fertility is made. In Russian.
Article
We studied vertical distribution of bacteria and viruses in different layers of the Arctic sea ice drilled at the North Pole. The sampled multi-year ice was characterized by uneven vertical distribution of bacterial abundance. This characteristic varied within the range of 8±1.2×103 to 95±2.6×103 cells ml-1. The layers with the maximal bacterial ab...
Article
Full-text available
We studied vertical distribution of bacteria and viruses in different layers of the Arctic sea ice drilled at the North Pole. The sampled multi-year ice was characterized by uneven vertical distribution of bacterial abundance. This characteristic varied within the range of 8 ± 1.2 × 10³ to 95 ± 2.6 × 10³ cells mL–1. The layers with the maximal bact...
Book
Full-text available
Abstract: The book generalizesthe results of the integrated monitoring of the ecosystem and special studies in the Rybinsk Reservoir during the years of its existence with a particular emphasis on the period of the last 15 years. The work highlights fundamental problems of hydrobiology and ecology, and the relationships between the long-term dynami...
Article
The abundances of virioplankton and planktonic picocyanobacteria in deep and shallow water sites of Rybinsk Reservoir during the freezing period (water temperature 0.3–0.9°C) varied from (37.1 to 84.1) × 10 ⁶ ((57.3 ± 2.1) × 10 ⁶ , on average) particles/ml and from 13.5 to 75.0 × 10 ³ ((48.7 ± 3.4) × 10 ³ , on average) cells/ml, respectively. The f...
Article
Trypanosomes are flagellated protozoa; they parasitize in the blood of a wide range of vertebrates and invertebrates, including fish, for which leeches are carriers. The metabolites released by trypanosomes are toxic to the host, cause disruption of homeostasis, which leads to illness and even death. Parasites in fish living in hot climates are the...
Article
Full-text available
The separate and combined effects of chronic 30-day exposure to the herbicide Roundup in a sublethal concentration of 2 μg/L and an increase in water temperature at a rate of 8°C/h on the parameters of red and white blood in juveniles of Amur sleeper Perccottus glenii Dybowski have been studied. The ratio of mature and immature erythrocytes in the...
Preprint
Full-text available
We studied vertical distribution of bacteria and viruses in different layers of the Arctic sea ice drilled at the North Pole. The sampled multi-year ice was characterized by uneven vertical distribution of bacterial abundance. This characteristic varied within the range of 8±1.2 ×103 to 95±2.6 ×103 cells ml-1. The average bacterial abundance was 28...
Preprint
Full-text available
We studied vertical distribution of bacteria and viruses in different layers of the Arctic sea ice drilled at the North Pole. The sampled multi-year ice was characterized by uneven vertical distribution of bacterial abundance. This characteristic varied within the range of 8±1.2 ×103 to 95±2.6 ×103 cells ml-1. The average bacterial abundance was 28...
Article
The distribution of structural and functional characteristics of virioplankton in the north of the Ob River estuary and the adjacent Kara Sea shelf (between latitudes 71°44′44″ N and 73°45′24″ N) was studied with consideration of the spatial variations in the number (NB) and productivity (PB) of bacteria and water properties (temperature, salinity,...
Article
The structural and functional properties of the bacterioplankton in two small rivers and the Sheksna River that run through the large industrial city of Cherepovets were studied from April to October 2009–2011. The three-year average numbers and biomass of planktonic bacteria in small rivers were 18.7–18.8 million cells/mL and 3.5–4.9 g/m³, respect...
Article
Full-text available
Roundup (Roundup) is one of the most widely used in the world systemic non-selective herbicide, including the Russian. The active ingredient in the pesticide is glyphosate (N- (phosphonomethyl) glycine, C 3H8NO5P), which has long been considered low-toxic herbicide for animals. In 2015, glyphosate was attributed to the potentially dangerous carcino...
Article
Full-text available
The paper considers the concentrations and functional characteristics of viruses, bacteria, and heterotrophic nanoflagellates determined for the first time in the Laptev Sea in August-September, 2014. The abundance of bacteria, viruses, and heterotrophic nanoflagellates varied from 110.1 × 10³ to 828.4 × 10³ cells/mL, from 384.2 × 10³ to 2932.8 × 1...
Article
Virioplankton and bacterioplankton abundance has been determined in the pelagic and littoral zones of the Rybinsk Reservoir during the ice-covered period. The role of viruses in heterotrophic bacterioplankton infection and mortality is assessed. At water temperatures between 0.3 and 0.9°C, the number of planktonic virus particles and planktonic bac...
Article
The total number and morphological and size composition of viriobenthos, number of bacteria infected by viruses, and burst size, as well as virus-induced mortality, abundance, and production of bacteriobenthos, have been estimated in bottom sediments of the Rybinsk Reservoir. The total number of viriobenthos in the reservoir varies within (1.1–10.9...
Article
The abundance, biomass, and production (Р В) of bacrerioplankton; the taxonomic composition, abundance, biomass of heterotrophic nanoflagellates (HNF) and the rate of consumption of bacteria by HNFs; and the abundance of virioplankton, frequency of visibly infected bacterial cells, virus-induced mortality of bacterioplankton, and viral production w...
Article
Full-text available
EFFECT OF HIGH TEMPERATURE ON BLOOD PARAMETERS IN JUVENILE SILVER CARP CARASSIUS AURATUS AND AMUR SLEEPER PERCCOTTUS GLENII. Abstract. The values of the critical thermal maximum under heating rate of the water from 4 to 40 °C/h in two fish species – the three-year silver carp Carassius auratus and two-year Amur sleeper Perccottus glenii were experi...
Article
Full-text available
The viral and bacterioplankton communities of the Barents Sea were investigated using a combination of methods of electron and epifluorescence microscopy for the first time. The quantitative composition of the communities and the nature of their interactions were also determined. Our study showed that during the summer the abundance and biomass of...
Article
The total number of viruses, morphological and size composition of viriobenthos, number of bacterial cells infected by viruses, number of mature phages inside bacterial cells, and virus-induced mortality of bacteriobenthos have been estimated in bottom sediments of the Ivankovo Reservoir. The total number of viriobenthos in the reservoir range from...
Article
Using TEM, the cytological structure of tumors first detected in zander in the Rybinsk Reservoir has been investigated. Cells containing an altered structure of nucleus and cytoplasm and cells including viruslike inclusions are found. The similarity of the detected changes with the dermatofibrosarcoma of fish in the United States and Canada is exam...
Article
Studies were conducted in shallow and deepwater areas of the Kara Sea. The abundance of bacteria (N B ) and the abundance of viruses (N V ) ranged within (19.4–2215.1) × 103 cells/ml and (97.6–5796.8) × 103 particles/ml, respectively. The virus to bacteria ratio varied from 1.4 to 29.1. A positive correlation was found between N B and N V (R = 0.87...
Article
The abundance and production of planktonic viruses, frequency of infected bacterial cells and number of mature phages in infected bacterial cells, and virus-induced mortality of bacterioplankton were studied in two small rivers and the large Sheksna River flowing through a large city in April–October, 2011. High positive correlations have been dete...
Article
During the summer season of 2010, abundance and productivity of picocyanobacteria in Gorky and Cheboksary Reservoirs have being examined. It is found out that in the eutrophic reservoirs of the Middle Volga abundance and biomass of picocyanobacteria, averaged over the water column, varied within the range of (34-322) x 10(3) cells/ml and 38-455 mg/...
Article
In July 2010, abnormally high water temperature (25–29°C), as well as increased biomass and phytoplankton production caused intensive development of heterotrophic bacteria and heterotrophic nanoflagellates. It was found that the abundance, biomass, and production of heterotrophic bacterioplankton, as well as the abundance and biomass of heterotroph...
Article
During the anomalously hot summer of 2010, the water temperature in the Gorky reservoir reached 27–33°C. Pronounced cyanobacterial blooms occurred in the limnetic part of the reservoir. The average values for bacterioplankton abundance (11.58 ± 1.25 × 106 cell/mL), biomass (886 ± 96 mg/m3), and production [169 ± 32 mg C/(m3 day)] were twice as high...
Article
Full-text available
In August–September 2009, the concentration of dissolved organic matter and quantitative distribution of virioplankton, bacterioplankton, and heterotrophic nanoflagellates were studied in the coastal waters of the Kara Sea, the fresh waters of the islands and the coasts of the sea, and the estuaries of the Ob’ and Yenisei rivers. A high positive co...
Article
In sites of the Rybinsk Reservoir with different levels of contamination by the municipal and industrial wastewater from the city of Cherepovets, the primary production of phytoplankton and the quantitative distribution of bacterioplankton, heterotrophic nanoflagellates, and viruses, as well as the content of finely disperse detritus, were investig...
Article
Full-text available
The quantitative distribution of viruses and their impact on heterotrophic bacterioplankton were studied in mesotrophic and eutrophic reservoirs of the Volga and Volga-Baltic waterway. The abundance of planktonic virus particles ranged from 9.4 × 106 to 120 × 106 ml−1 and was from 2.5 to 9 times greater than the bacterial numbers. Production of vir...
Article
Full-text available
In aquatic ecosystems, viruses are considered to be an important factor controlling bacterioand phy� toplankton abundance, production, and diversity and play an important role in the biogeochemical cycles of carbon and other components (1). Analysis of litera� ture on ecology of aquatic viruses shows that, at present, viruses in freshwaters are les...
Book
Full-text available
В книге обобщены результаты комплексных исследований гидрологического и биологического режима оз. Севан в начальный период повышения его уровня, проведенных в рамках Российско-Армянской биологической экспедиции (2005– 2009 гг.). Описывается флора и растительность озера и его притоков, структура планктонных и бентосных сообществ, ихтио- и паразитофа...
Article
Full-text available
The quantitative distribution and relationships of picocyanobacteria and viruses were studied in the mesotrophic Sheksna and mesoeutrophic Rybinsk reservoirs belonging to the system of the Volga-Baltic Waterway. The share of picocyanobacteria in the sum biomass and production of phytoplankton decreased along with increase in the productivity in the...
Article
The indices of the cellular and humoral components of natural immunity in bream from parts of the Rybinsk Reservoir with different extents of contamination are studied. Considerable differences were revealed in a range of parameters between the fish sampled in the Sheksninskii reach, which receives waste-waters from the Cherepovets industrial cente...
Article
The composition and proportions of leucocytes in the head and trunk parts of the kidney have been comparatively studied in 12 species of sexually mature marine and freshwater fish of the orders Cyprin-iformes and Perciformes. The similarities and differences in the proportions of various types of cells in these organs of these fish species are show...
Article
The changes in some morphofunctional and immune-physiological parameters in perch (Perca fluviatilis) underyearlings exposed to sublethal cadmium chloride concentration have been analyzed. The fluctuations of kidney index values and stimulating effect of toxicant upon humoral factors of nonspecific immunity have been revealed. The leucocytes ratio...
Article
Full-text available
Spatial distribution of planktonic viral particles (virioplankton) and mortality of heterotrophic bacteria caused by viral lysis were studied in the eutrophic Ivan’kovskoe and mesotrophic Uglichskoe reservoirs (the Upper Volga). During the summer peak of phytoplankton, the number of viral particles was higher in the Ivan’kovskoe Reservoir ((55.1 ±...
Article
Full-text available
The role of autochthonous viruses in the regulation of bacterioplankton abundance and production was studied in the Rybinsk Reservoir. During the ice-free period, the number of virus-like particles varied within the range of (11.0-57.4) x 10(6) particles/ml. The virus to bacterioplankton abundance ratio ranged within 3.0-9.4. From 4 to 25% of bacte...
Article
Quantitative composition of leukocytes and structure of spleen of the perch Perca fluviatilis L. from water reservoirs with different pH and color of water were studied. Changes of proportion of lymphocytes, macrophages, and band neutrophils are shown in fish from reservoirs with different pH level. Two types of small blood vessels are revealed and...
Article
Influence of malathion at 5mg/L on the lysozyme contents, antibacterial activity and antibody titre in serum and tissues of kidney and spleen of common carp (C. carpio) immunized with heat-inactivated Aeromonas hydrophila was studied at 22±2°C for up to 3 weeks. The antibacterial activity of sera was almost identical in test and control groups, whe...
Article
The comparative analysis of the perch Perca fluviatilis liver has been performed by the methods of light and electron microscopy. Unlike the fish from a neutral-acidity lake and from the Rybinskoe Reservoir, in the liver of the perches from acidic lakes, some differences at the cellular level were revealed. They consisted in an increased secretion,...
Article
The response of immunocompetent cells of underyearling carps on different concentrations (0.05, 0.1, 1.0, 5.0 and 10.0 ml/l) of phospho-organic pesticide in water is described. Data on changes in the ultrastructural organization of immunocytes and their relationship with toxicant concentrations are given.

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