Long-term dynamics of the heterоtrophic bacterioplankton development in the mouth of the Usinsky bay of the Kuibyshev reservoir
https://doi.org/10.35885/1684-7318-2024-3-323-330
Abstract
Data of our long-term observations of the bacterioplankton development in the mouth section of the Usinsky bay (the Kuibyshev reservoir) during the summer–autumn periods are presented. The total abundance of heterotrophic bacterioplankton varied within (1.61–7.44)×106 cells/mL, the biomass was 39.01–249.53 µgC/L, which corresponds to III–V water quality classes. Between 2010 and 2017 the total abundance of heterotrophic bacterioplankton was nonmonotonically decreasing, and since 2021 its significant increase is recorded. Among heterotrophic bacteria, single freefloating cells predominated, mainly cocci and coccobacilli, and the proportion of rod-shaped cells increased during cyanobacterial bloom. Picocyanobacteria and picodetritus particles were almost always present in plankton, but their average contribution to the total organic carbon of picoseston was insignificant.
Keywords
Supporting agencies: The work was performed within the framework of the state assignment of the Institute of Ecology of the Volga Basin of the Russian Academy of Sciences, a branch of the Samara Scientific Center of the Russian Academy of Sciences (No. 122032500063-0)
About the Authors
E. S. Krasnova
Samara Federal Research Center of RAS, Institute of Ecology of the Volga River Basin of Russian Academy of Sciences
Russian Federation
Russian Federation
Ekaterina S. Krasnova - Laboratory Biodiversity.
10 Komzina St., Togliatti 445003
M. V. Umanskaya
Samara Federal Research Center of RAS, Institute of Ecology of the Volga River Basin of Russian Academy of Sciences
Russian Federation
Russian Federation
Marina V. Umanskaya
10 Komzina St., Togliatti 445003
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For citations:
Krasnova E.S., Umanskaya M.V. Long-term dynamics of the heterоtrophic bacterioplankton development in the mouth of the Usinsky bay of the Kuibyshev reservoir. Povolzhskiy Journal of Ecology. 2024;(3):323-330. (In Russ.) https://doi.org/10.35885/1684-7318-2024-3-323-330
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