T. S. Maslennikova's research while affiliated with Russian Academy of Sciences and other places

Publications (12)

Article
Full-text available
On the basis of our own and published data, the contribution of autotrophic communities to the total primary production in the ecosystem of the Rybinsk Reservoir was estimated during the vegetation season in 2009. The contributions were as follows: 390 198 t C for phytoplankton, 6100 t C for epiphyton, 115 550 t C for macrophytes, and 1491 t C for...
Article
The seasonal and long-term dynamics of phytoplankton primary production has been studied in the Rybinsk Reservoir (Upper Volga) in 2005–2014. A positive correlation has been found to exist between the values of plankton primary production, averaged over vegetation period, and the abiotic factors of the water medium (temperature, solar radiation, an...
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
Full-text available
The spatial distribution and seasonal dynamics of heterotrophic bacterioplankton production have been studied and the value of autochthonous sources of substrates for bacteria has been evaluated in the pelagic zone of the meso-eutrophic Rybinsk Reservoir (the Upper Volga). During the vegetation period, the bacterial production ranges from 32 to 135...
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
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
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
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),...

Citations

... Juveniles of these species develop among aquatic plant stands all summer long and leave their feeding grounds only during a sharp deterioration of the habitat conditions, e.g., a sharp decrease in the water level or autumn cooling of the water (Stolbunov, 2007). HAV makes the main contribution (74.4%) to the primary production of the reservoir (Kopylov et al., 2019). Therefore, understanding the patterns of overgrowing processes in protected shallow waters and their trend is an important fundamental and applied problem. ...
... Of particular interest is assessing the influence of climate changes on the state and functioning of freshwater biohydrocenoses of reservoirs, which are classified as quasi-cyclic systems with significant anthropogenic load (Korneva et al., 2016(Korneva et al., , 2019Gelca et al., 2016;Kopylov et al., 2019Kopylov et al., , 2020Golubkov, 2021). Warming leads to an increase in mineralization, the transformation of cycles of biogenic elements, a decrease in transparency and the oxygen content, an increase in the proportion of autochthonous OM, biodiversity changes, etc., in these water bodies. ...
... 252-254) grazing selectively on large and active bacteria (Gonzalez, 1996). The abundance of heterotrophic nanoflagel-lates in the surveyed parts of the Rybinsk Reservoir was low and did not exceed 253 cells/mL while averaging 102 ± 14 cells/mL (Kopylov et al., 2016b). Unlike the vegetation period (Kopylov et al., 2016a), their effect on bacterioplankton was insignificant: they grazed daily only on 0.5-2.0% ...
... 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). ...
... During the surveyed period, the frequency of infected bacterial cells (13.1 ± 1.2% N B ) and virusinduced mortality of bacterioplankton (17.2 ± 2.0% Р B ) were lower in the mesoeutrophic Rybinsk Reservoir than in eutrophic reservoirs of the Volga River: in the Gorky (17.8 ± 2.2% and 26.9 ± 4.6%) and Cheboksary (16.1 ± 1.2% and 22.4 ± 2.7%, respectively) reservoirs (Kopylov et al., 2013a(Kopylov et al., , 2013b. ...
... Bacteria also gain an advantage if they are in the area of the generated electromagnetic field, including an extremely weak field. In our experiments, we compared the activity of the bacteria Pseudomonas fluorescens VKM B-2170 in the presence of a geomagnetic field with a "geomagnetic vacuum" organized as a compensated magnetic field (Anisimov et al. 2005). The results showed that the presence or absence of the geomagnetic field did not affect the bacterial uptake of organic matter (sugar and amino acids with 14 C radioactive markers). ...
... It has also been reported that viruses from different stages of infection are released from host bacterial cells at the same time, which can cause a large increase for the VBR value (Siokou-Frangou et al., 2010). Viruses can stimulate the growth of bacteria, and there are close relationships between viruses and bacteria, which has been supported by the results of many studies (Shelford and Suttle, 2018;Bongiorni et al., 2005;Stroinov et al., 2011;Vrede et al., 2003). In our study, we found that the abundance of viruses was positively related to abundance of bacteria. ...
... The first year, which was not distinguished against the general background by either the temperature regime or the water content conditions, ended the cycle of the decline in the phytoplankton productivity in the reservoir (Lazareva, 2018). Chlorophyll content in the Rybinsk Reservoir, as well as in other reservoirs of the Volga River (Kopylov et al., 2012), was not too large in 2010. However, the conditions of the abnormally hot summer in 2010 were the driving force for the subsequent growth of trophic state and the formation of a prolonged summer phytoplankton maximum with high concentrations of ƩCHL and CHL Cyan in 2011-2016. ...