Alexandr Tsvetkov

Alexandr Tsvetkov
Russian Academy of Sciences | RAS · Papanin Institute of the Biology of Inland Waters

About

38
Publications
4,028
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60
Citations
Citations since 2016
29 Research Items
52 Citations
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2016201720182019202020212022051015
2016201720182019202020212022051015

Publications

Publications (38)
Article
For the first time in the Mekong delta (Vietnam), the abundance and biomass of the main components of the planktonic microbial food web, and namely: bacteria, picophytoplankton, and heterotrophic and phototrophic flagellates were determined; the features of their spatial distribution and the species diversity of heterotrophic flagellates were studi...
Article
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Changes in the higher aquatic vegetation (HAV) of the protected shallow water “Krasnyi Ruchei” from 1989 to 2019 have been analyzed based on aerial imageries, multidate satellite images, and direct field studies. Images from the second half of July to late September are used to study of the overgrowing. An inverse relationship has been found betwee...
Article
Full-text available
Changes in the higher aquatic vegetation (HAV) of the protected shallow water “Krasnyi Ruchei” from 1989 to 2019 have been analyzed based on aerial photographs, satellite images of different times and direct field studies. Images from the second half of July up to the end of September have been used for study of the overgrowing. An inverse relation...
Book
Full-text available
Rivers of Europe, Second Edition, presents the latest update on the only primary source of complete and comparative baseline data on the biological and hydrological characteristics of more than 180 of the highest profile rivers in Europe. With even more full-color photographs and maps, the book includes conservation information on current patterns...
Chapter
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This chapter contains a comprehensive description of the Volga River, the largest river in Europe, and its main tributaries, the Kama, Oka, Sheksna. It starts with a review of human history and biogeographical setting including paleogeography of the basin, as well as description of physiography and climate, and features of hydrological and biogeoch...
Article
The changes in depth, temperature, water conductivity, and dissolved oxygen concentration in six floodplain lakes are described in regard to the dynamics of spring flooding and overgrowth by macrophytes. The influence of these factors on the composition and structure of macrozoobenthos communities is analyzed. The observed number of species refers...
Article
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Daphnia (Ctenodaphnia) magna Straus, a large species of the order Cladocera, was revealed to have disappeared from the zooplankton composition with an increase in the density of whitefish, Coregonus lavaretus L., in Lake Sevan, Armenia. This caused an increase in the quantitative characteristics of heterotrophic nanoflagellates, as a result of whic...
Article
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The paper presents the characteristics of sapropel based on the results of analysis of samples collected at 21 stations in Lake Nero. Its current state is assessed based on hydrophysical and hydrochemical parameters. A layer-by-layer (0–10, 30–40 and 60–70 cm) granulometric composition of stratigraphic cores made it possible to compare the evolutio...
Article
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Human activity has disturbed the functioning of river ecosystems all around the globe. The current global climatic fluctuations and local anthropogenic impact lead to rearrangement in the structure and functioning of aquatic communities. One of the most important components of aquatic ecosystems is phytoplankton as the main primary producer of the...
Article
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This paper presents the first data on the flora of silica-scaled chrysophytes (orders Synurales and Paraphysomonadales) in the delta of the Mekong River (Vietnam). A total of 15 taxa have been identified: nine from the genus Mallomonas, one from Synura, and five from Paraphysomonas. Six taxa are reported for the first time from Vietnam. At most sit...
Article
Приведены первые данные о флоре золотистых водорослей из порядков Synurales, Paraphysomonadales. Выявлено 15 таксонов, из них 9 рода Mallomonas, 1 – рода Synura, 5 родa Paraphysomonas. Шесть таксонов впервые отмечены во Вьетнаме. Распределение найденных таксонов по станциям было неравномерным, чаще всего присутствовало по одному-два вида. Наибольше...
Article
The interannual changes in the zooplankton of periodically drying (pulsating) lakes at the beginning of the stabilization period of their level regime under conditions of significant fluctuations in the amount of precipitation, air temperature, and water mineralization are analyzed. It has been shown that the amount of precipitation, the increase o...
Article
Full-text available
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
Full-text available
Annual changes in the quantitative characteristics and structure of zooplankton in the pelagic and littoral zones of Lake Sevan in October have been determined by a number of factors, among which the biomass of the main planktophage, whitefish (Coregonus lavaretus L., 1758), have the greatest effect. The richest communities form due to Cladocera up...
Article
Full-text available
Based on the materials of monitoring of bottom sediments and a special voyage of the RV Akademik Topchiev in 2016–2018 in the Sheksna Reach of the Rybinsk Reservoir which is a recipient of semi-purified waste waters from chemical and metallurgical enterprises of the city of Cherepovets, the role of the littoral zone in dilution of pollutants in wat...
Article
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The dynamics of the water budget of Orog Nuur and Taatsiin Tsagaan Nuur fluctuating lakes in the Valley of the Lakes (Western Mongolia) in the period 2010–2018 is studied. It is shown that Orog Nuur Lake has passed to the wet phase in its long-term cycle, while Taatsiin Tsagaan Nuur Lake is currently in a transitional phase, which in previous cycle...
Article
Full-text available
The dynamics of the water budget of Orog Nuur and Taatsiin Tsagaan Nuur fluctuating lakes in the Valley of the Lakes (Western Mongolia) in the period 2010–2018 is studied. It is shown that Orog Nuur Lake has passed to the wet phase in its long-term cycle, while Taatsiin Tsagaan Nuur Lake is currently in a transitional phase, which in previous cycle...
Article
Full-text available
Based on an analysis of interannual changes in the summer zooplankton of the littoral and pelagic zones in Lake Sevan, the relationship between the quantitative characteristics of the communities with the level regime, the amount of precipitation, the average monthly temperature from April to July, and ichthyomass is shown. Fluctuations in the wate...
Article
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Исследовано пространственное распределение рыб на двух участках р. Хопер (каждый длиной 9 км) в Хоперском заповеднике и вне его с использованием эхолота горизонтального зондирования. Изучены плотности рыб на отрезках русла реки с разной степенью меандрирования и глубиной, а также влияние на распределение рыб островов и скоплений древесных остатков....
Article
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The spatial distribution of fish in two 9-km-long sections of the Khoper River, both in the Khoper Nature Reserve and outside it, has been studied using a horizontal-beam echo sounder. Fish densities in the river-bed stretches with a different degree of meandering and depths and the effect of islands and accumulations of woody debris on fish distri...
Article
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The main characteristics of the population of Dreissena polymor­pha (Pallas, 1771) in Lake Pleshcheyevo in 2014–2016 are dis- cussed, and two different sampling methods for D. polymorpha are compared. The lack of mass reproduction of D. polymorpha in 2015 is possibly related, among other causes, to climate change and alterations in the temperature...
Article
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The interannual differences in the zooplankton of the coastal zone of two different types of reservoirs were analyzed, depending on the location along the longitudinal profile of water bodies, the amount of atmospheric precipitation, air temperature, the level and electrical conductivity of the water, and the morphometry of the water areas. The zoo...
Article
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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...
Article
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A stratification site was detected according to the water conductivity in the frontal zone of the mouth part of the tributary of a plains reservoir. The “second bottom” effect is shown to occur in the lower, denser layer of river waters, where the zooplankton, whose structural and functional characteristics differ from those in overlying and underl...
Article
Full-text available
The results of structural hydrophysical investigations at the Pleshcheyevo Lake are presented. There were at first revealed on the base of the data of direct measurements the distributions of parameters of current velocity and of water composition in lake. The theoretical distribution of current velocity with taken in to account the influence of in...
Article
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It is shown that, when the amount of atmospheric precipitation increases, the changes in zooplankton indices in the background area in the littoral zone of a high-trophic lake are similar to those observed under increased organic and biogenic load in the course of anthropogenic eutrophication: the diversity and abundance of rotifer increase and the...
Article
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In 2008, transition (gradient) and stable zones in backwaters of the tributary of the Rybinsk Reservoir were distinguished according to water conductivity. The highest values of BOD5 (biochemical oxygen demand) and the maximum zooplankton abundance within the backwater zone as well as in comparison with the neighboring systems (the river and the re...
Article
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The hydrophysical characteristics and indices of zooplankton are given for the confluence zones of small and medium tributaries and channels of the Don and Khoper rivers within the territory of Voronezh oblast. Three types of confluence areas of tributaries and recipient rivers are described. In these areas the water masses mix and habitats differi...
Article
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The transitive and stable sites in the zone of changeable backup waters of inflow in the Ribinsk reservoir are determined on their physical-chemical parameters. The distribution of bacterioplankton and zooplankton and the density of the fish population are described. The similarities and distinctions of hydrobionts in the river, reservoir, and the...
Article
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The length of life cycle, means of dispersion, and diary rhytm of cercariae emission in the trematode Sphaerostomum sp. living in the mollusc C. inflata have been studied.
Article
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An experimental study of Hirudinea (7 species), Oligochaeta (5), Turbellaria (5), Gastropoda (18) and Bivalvia (2) receptivity to invasion of cercaris Sphaerostomum bramae and Sph. globpoirum has been carried out. In Hirudinea only Erpobdella octoculata displays susceptibility to invasion. Most Oligochaeta (4 species) are highly susceptible to inva...

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