Ekaterina Sakharova

Ekaterina Sakharova
Russian Academy of Sciences | RAS · laboratory of algology

PhD

About

37
Publications
2,862
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126
Citations
Citations since 2017
34 Research Items
118 Citations
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2017201820192020202120222023010203040
2017201820192020202120222023010203040

Publications

Publications (37)
Article
Full-text available
The transfer pathways of organic matter and elements from phytoplankton to zooplankton in freshwater ecosystems are important for understanding how aquatic ecosystems function. We conducted a mesocosm experiment to determine how fish and zebra mussels altered the transfer efficiencies of essential substances including carbon (C), polyunsaturated fa...
Article
The abundance, biomass, and composition of the dominant phytoplankton species in the shallow-water high-trophic lake Nero in June and August 2017 were analyzed. The analysis of its spatial distribution over the water area of the lake, comparison of the data obtained with the results of the previous study period up to 2012–2013, and a statistical an...
Article
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The phytoplankton and vascular aquatic plants have been studied in small lakes Vashutinskoe, Chashnitskoe, Ryumniki, and Zaozer’e, located in the southern part of the Yaroslavl Region, Russia. The taxonomic composition of phytoplankton comprised 137 species of algae belonging to 8 divisions, 18 orders, and 76 genera. The studied water bodies were c...
Article
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Samples were collected in the area of the St. Anna Trough in the northern Kara Sea in September 2015 and July-August 2016. Based on salinity and temperature distribution, four areas have been distinguished: the shelf adjacent to the St. Anna Trough, the shelf edge, and the upper and lower parts of the continental slope. The variability of the struc...
Article
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A study of the horizontal and vertical distribution of phytoplankton in Lake Sevan was conductedin mid-July 2018 during the maximum Cyanoprokaryota blooms. The summer biomass of algae in the pelagiczone of the lake corresponded to values of mesatrophic waters. The Cyanoprokaryota biomass in Lake Sevanhas horizontal and vertical heterogeneity and is...
Article
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We conducted two mesocosm experiments to determine how invasive zebra mussels affected phytoplankton community and size structure in the summers of 2014 and 2017. Water containing natural phytoplankton and zooplankton communities was collected from the eutrophic Lake Mikołajskie (Masurian Lake District, northeastern Poland) and used to start each e...
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The structural parameters of phytoplankton in the estuarine region of a small tributary (Ild River) were studied in 2009–2011 and compared with the adjacent sections of the free-flowing section of the river and the pelagic zone of the Rybinsk Reservoir. Phytoplankton of the mouth estuarine region of the Ild River is characterized by high floristic...
Article
The research was done at transect (11 stations) from inner part of the Khatanga Bay in the south to continental slope area in the north from 17 to 20 September 2017. Four biotops with different parameters of pelagic environment, composition, quantitative characteristics and vertical distribution of phytoplankton were allocated: inner part of the Kh...
Article
The dynamics and relationship between planktonic algae, bacteria, protozoa, invertebrates, and viruses were studied at different sites in shallow littoral zones of the Rybinsk Reservoir (Upper Volga) in April-June. The features of seasonal succession of different components of the littoral plankton community have been identified. The spring peak in...
Article
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Understanding the factors that regulate phytoplankton and zooplankton is an important goal of aquatic ecologists; however, much remains unknown because of complex interactions between phytoplankton, zooplankton, and fish. Zooplankton, in particular cladocerans, can be regulated by bottom–up factors either via food quantity or food quality in terms...
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An experimental study of the impacts of trophic conditions and the activity of zooplankton and fish on the phytoplankton structure has shown that, at the beginning of the experiment, the species and size structures of algae were dependent on the N : P ratio. This parameter causes the differences in phytoplankton structures between mesotrophic and e...
Article
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The high Arctic, including the Svalbard archipelago in the North Atlantic, has been exposed to direct and indirect drivers of climatic change such as rising temperatures and associated changes in hydrology and nutrient fluxes. In addition, the number of migrating birds, particularly geese, increased remarkably in the Svalbard archipelago during the...
Article
1. The high Arctic, including the Svalbard archipelago in the North Atlantic, has been exposed to direct and indirect drivers of climatic change such as rising temperatures and associated changes in hydrology and nutrient fluxes. In addition, the number of migrating birds, particularly geese, increased remarkably in the Svalbard archipelago during...
Article
Based on the material obtained in the spring–summer season of 2016, the composition and quantitative distribution of phytoplankton in the Ob estuary and over the Kara Sea shelf has been estimated. The latitudinal extent of the region exceeded 5° (~560 km), encompassing areas with different river discharge impact, which formed latitudinal zoning in...
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The bivalve Dreissena polymorpha (Pallas, 1771) was shown to significantly decrease the biomass of cyanoprokaryotes in water collected from Lake Mikolajskoe (Poland) including potentially toxic species Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju. However, the mollusks increased the biomass of large filaments of green algae w...
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Phyto- and zooplankton communities developing in the open overgrown shallows of the Rybinsk Reservoir under the influence of a bird colony are shown to lose specific traits of quantitative characteristics and structure fluctuation in response to the elevated water level in contrast to previous findings. Possible reasons, such as the decomposition o...
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The features of the floristic composition and dynamics of the biomass of phytoplankton in shallow and deep areas of the Volga reach in the Rybinsk Reservoir have been studied during years with different thermal and water-level regimes (2009–2011). The floristic diversity and biomass of phytoplankton increase with a decrease in depth. The increase i...
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The experiments were performed in microcosms situated on a control site and on a site regulated by beavers. Two cladoceran species of different sizes were placed in microcosms in different proportions. It was found that the vital activity products of Castor fiber L. promote an increase in the concentration of total phosphorus (P), a decrease in the...
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Changes in phytoplankton community composition typical for the increase in water trophic level had been noticed in 2009–2011 at the site of the open shallow of the Volga Reach in Rybinsk Reservoir (Volga), which is under the impact of grey heron colonies. The reduction in floristic abundance, the increase in the phytoplankton total biomass, and the...
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Several structural indices of phytoplankton in the protected shallows of Volzhskii reach of the Rybinsk Reservoir in the zone impacted by the nesting colony of black-headed gulls (Larus ridibundus L.) are analyzed. The study reveals transformations of phytoplankton in the affected zone: an increase in total biomass, a decrease in species and relati...
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A new species of planktic dinoflagellates flora Peridiniopsis kevei Grigor. et Vasas has been found in 1989–2011 in the phytoplankton of the upper Volga River reservoirs (Ivankovo, Uglich, Rybinsk, and Gorky reservoirs). The analysis of successive findings and the distribution of this species in the reservoirs are presented. It is shown that the be...
Article
Full-text available
The results of observations of some abiotic (water transparency, light intensity, depth, biogenic element concentrations) and algological (chlorophyll concentration, phytoplankton abundance and biomass, the concentration of microcystines—toxins of blue-green algae) characteristics of Lake Nero are given for study periods of 1999–2004 and 2005–2007....

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