A. V. Romanenko's research while affiliated with Russian Academy of Sciences and other places

Publications (20)

Article
Full-text available
A small amount of information about the composition and functioning of prokaryotes and viruses in the Kara, Laptev and East Siberian seas makes it impossible to provide a quantitative assessment of all parameters of the carbon cycle which is necessary to analyze and predict the impact of climate change on the entire Arctic biota. Of particular inte...
Article
In September 2017, studies were conducted in the East Siberian Sea along the transect from a Indigirka delta to the ice edge at the outer shelf margin. The abundances of planktonic prokaryotes (NPR) and free viruses (NV), frequency of visibly infected prokaryotic cells (FVIC), and virus-mediated mortality of prokaryotes (VMPR) varied within (0.5–3....
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...
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 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
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
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
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
The spatial distribution of virio- and bacterioplankton and the role that viruses play in heterotrophic bacteria elimination was studied in the small Il’d’ River (Rybinskoe Reservoir tributary, Upper Volga). The bacterioplankton abundance and biomass constituted 3.3–19.6 (8.5 on average) million cells/ml and 501–2353 mg/m3 (1054 mg/m3 on average),...
Article
The first data on the content of pico-sized detrital particles (0.2–2.0 μm) are obtained by epifluorescence microscopy in the upper Volga reservoirs. The spatial and temporal distributions of density and mass of picodetritus are described. The quantitative proportions between heterotrophic bacteria, picophytoplankton, and pico-sized detritus were r...
Article
The structure of planktic trophic chains was studied in eight lakes of European Russia and five lakes in Central Asia. The lakes differed in the level of productivity, morphometric parameters, and the type of agitation and mineralization. It is found that the microbial loop of picophototrophic organisms, bacteria, heterotrophic flagellates, infusor...
Article
Full-text available
First data obtained in 2003 during combined ecological studies of 7 soft-water karst lakes are presented. The lakes are situated on the territory of the Klyazminsky-Lukhsky complex nature reserve (Vladimir Oblast). The lakes studied are: Yukhor, Kschara, Sankhar, Bolshiye (Big) Garavy, Maliye (Small) Garavy, and Svetlen'koye. The lakes Yukhor, Ksch...
Article
Full-text available
Rates of oxygenic and anoxygenic photosynthesis, chemoautotrophic and heterotrophic bacterial production and protozoan bacterivory were measured in the pelagic zone of the stratified brackish-water lake with the purpose to determine the vertical distribution of these processes and to estimate their significance in the functioning of planktonic comm...
Article
Full-text available
The distribution of primary components of the microbial community (autotrophic pico- and nanoplankton, phototrophic bacteria, heterotrophic bacteria, microscopic fungi, heterotrophic flagellates, ciliates and heliozoa) in the water column of Lake Shira, a steppe brackish-water, stratified lake in Khakasia, Siberia (Russia), were assessed in midsumm...
Article
Full-text available
The structure of planktic trophic chains was studied in eight lakes of European Russia and five lakes in Central Asia. The lakes differed in the level of productivity, morphometric parameters, and the type of agitation and mineralization. It is found that the microbial loop of picophototrophic organisms, bacteria, heterotrophic flagellates, infusor...

Citations

... Prokaryotes are typically simple, single-celled organisms; they have ribosomes to make proteins, a membrane and a cell wall to contain the contents of the cell, and their DNA is packed up in the middle of the cell [286][287][288][289][290]. Certain prokaryotes, consisting of some species of Archaea and bacteria, use anaerobic respiration, which can be discovered in soil and in the digestive tracts of ruminants, like cows and sheep [291][292][293][294]. Many prokaryotes can switch between aerobic respiration and fermentation, depending on the availability of oxygen [295][296][297]. The group of Archaea called methanogens decreases carbon dioxide to methane to oxidize NADH, and some sulfate-reducing bacteria and Archaea are anaerobic, decline sulfate to hydrogen sulfide to regenerate NAD + from NADH [298][299][300]. ...
... The aim of this work was to study the effects of runoff from large Siberian rivers on the structural and functional characteristics of virus communities on the inner and outer shelves of the Siberian Arctic seas. Based on the published (Kopylov et al. 2015(Kopylov et al. , 2017(Kopylov et al. , 2020(Kopylov et al. , 2021a and unpublished new data, this article is the first to briefly overview the features of the virioplankton structure, the level of viral infection, and virus-induced mortality of heterotrophic prokaryotes in the riverine and marine waters mixing zone versus those in the zones significantly less subjected to the effect of runoff from the Ob and Yenisei rivers in the Kara Sea; the Lena River in the Laptev Sea; and the Indigirka and Kolyma rivers in the East Siberian Sea. ...
... Some decrease in the number of scales in lateral line, vertebrae, and pores of the canals of seismosensory system in skull bones of the fish from Lake Sankhar was revealed. This may be determined by the decline in the functional load on these fish in the typically lacustrine conditions and, possibly, by the influence of heavy metals found in the bottom sediments of the lake [7]. An analysis based on the set of all studied morphometric parameter shows that the group of rudd from Lake Sankhar represents a separate cluster (Fig. 1). ...
... It has played many key roles in the process of biogeochemical circulation, including ammonia oxidation, degradation, adsorption, fixation of carbon dioxide and nitrogen [1][2][3][4][5].It is an important goal of microbial ecology to study that which habitat or environmental factors can affect the bacterioplankton community structure, and revealing the spatio-temporal variation of the bacterioplankton community is helpful to clarify the variation process and functional maintenance of microorganisms [6,7]. In the aquatic system, the bacterioplankton communities are highly dynamic [8][9][10], because that their composition, diversity, and function may be influenced by environmental changes [11,12]. Previous studies had shown that spatial and temporal variations in the community structure of the bacterioplankton were affected by many environmental factors, such as temperature [13], dissolved oxygen levels [14], pH [15], nutrient [16], organic matter [17] and salinity [18]. ...
... The aim of this work was to study the effects of runoff from large Siberian rivers on the structural and functional characteristics of virus communities on the inner and outer shelves of the Siberian Arctic seas. Based on the published (Kopylov et al. 2015(Kopylov et al. , 2017(Kopylov et al. , 2020(Kopylov et al. , 2021a and unpublished new data, this article is the first to briefly overview the features of the virioplankton structure, the level of viral infection, and virus-induced mortality of heterotrophic prokaryotes in the riverine and marine waters mixing zone versus those in the zones significantly less subjected to the effect of runoff from the Ob and Yenisei rivers in the Kara Sea; the Lena River in the Laptev Sea; and the Indigirka and Kolyma rivers in the East Siberian Sea. ...
... Bacterial abundance increased in the northern part of the transect, while salinity did not decrease below 25.6 PSU (stations 5604-5607). The Only few studies examined bacterioplankton of the Laptev Sea estuaries to date [4,30,32]. No data on bacterial communities of the East Siberian Sea were published so far. ...
... Thus, Chydorus sphaericus and Bosmina coregonii are characc terized by a narrow interspace in their carapaces and are able to filter only small phytoplankton species, bacteria, and detritus particles [27]. A low grazing pressure on the phytoplankton which does not exceed 12–14% on average throughout the season may evii dence energy transport predominantly through the detritussderived food chain [8]. In the 1980s, when large filter feeders dominated in the Curonian Lagoon, their grazing pressure reached up to 60% (Table 2) [10]. ...
... In the study, we used the results of our research conducted in the Ivankovo Reservoir in July-August of 2005-2012, particularly: assessing the primary production of phytoplankton, concentration of chlorophyll "a" in the water, biomass of virio-and bacterioplankton, virio-and bacteriobenthos (in the upper 2 cm layer of the bottom sediments), bacterioepiphyton, plankton and benthos heterotrophic nanoflagellates, plankton ciliates, multicellular zooplankton and macrozoobenthos (Kopylov & Kosolapov, 2008;Kopylov et al., 2011Kopylov et al., , 2015Rybakova & Kopylov, 2017). Also we used the literature data on biomass and production of phytobenthos, content of chlorophyll in the epiphyton and benthos, higher aquatic plants and meiobenthos (Ekzertsev, 1978;Devyatkin, 1983;Kopylov, 2001;Shcherbina, 2002). ...
... In particular, the long-term research of Cyanobacteria in the river Volga and many other water reservoirs of the Volga basin showed that the content of different species of these organisms reached rather high values in summer. For example, it was shown that average quantity and biomass of Picocyanobacteria in Gorky and Cheboksary basins of the river Volga might range between 34-322 × 10 3 cells per mL and 38-455 mg/mL 3 respectively in summer [176]. In addition, molecular genetics methods and immunoassay, the populations of toxic Cyanobacteria synthesizing hepatotoxin (microcystin), were discovered in Upper Volga reservoirs [177]. ...
... Apparently, these processes have a significant effect on the development of heterotrophic bacteria in mesotrophic and eutrophic reservoirs of the Volga cascade. In summer 2010, a twofold increase in the abundance, biomass, and production of bacterioplankton was recorded in the Gorky Reservoir when compared to years with a normal thermal regime (Kopylov et al., 2013). ...