Long-Term Dynamics of Heterotrophic Bacterioplankton in a Large Eutrophic Reservoir

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Abstract

The results of long-term determinations of the abundance, biomass, and production of heterotrophic bacterioplankton in the eutrophic Gorky Reservoir (Middle Volga) are discussed. The mean values of the parameters increased 1.7–1.9 times in 2015–2016 when compared to 1991–1999. During the entire period of studies, the maximum values were recorded in the abnormally hot summer of 2010, when the temperature of the surface water reached 33°C. Apparently, an increase in the abundance and production and proportion of aggregated bacterioplankton is associated with an increase in water temperature and primary production, eutrophication, and contamination of the reservoir.

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Funding

This study was performed within the framework of a state assignment (project no. АААА-А18-118012690098-5) and partially supported by a program of fundamental research of the Department of Biological Sciences, Russian Academy of Sciences (“Biodiversity of Natural Ecosystems. Biological Resources of Russia: Assessment of the State and Fundamentals of Monitoring”).

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Correspondence to A. I. Kopylov or D. B. Kosolapov.

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Translated by N. Ruban

Abbreviations: Вb, biomass of bacterioplankton; Nb, abundance of bacterioplankton; Vb, volume of bacterial cells, Pb; production of bacterioplankton; and PPHY, production of phytoplankton.

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Kopylov, A.I., Kosolapov, D.B. & Mikryakova, I.S. Long-Term Dynamics of Heterotrophic Bacterioplankton in a Large Eutrophic Reservoir. Inland Water Biol 13, 585–591 (2020). https://doi.org/10.1134/S1995082920040045

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Keywords:

  • heterotrophic bacterioplankton
  • long-term dynamics
  • large eutrophic plain reservoir