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Heterotrophic nanoflagellates in water column and bottom sediments of the Rybinsk Reservoir: Species composition, abundance, biomass and their grazing impact on bacteria

  • Zooplankton, Zoobenthos, and Zooperiphyton
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Abstract

Abundance, biomass, and taxonomic composition of heterotrophic nanoflagellates (HNFs) have been determined in the water column and bottom sediments of the large lowland meso-eutrophic reservoir (Rybinsk Reservoir, Upper Volga) in summer. The role of HNFs in the consumption of the bacterial production is estimated. In the reservoir, 55 species from 15 large taxa, including 35 species from the plankton, are identified and 45 species are from benthos samples. The orders Kinetoplastida, Choanomonada, and Chrysomonadida are distinguished by the highest species diversity. Abundance and biomass of HNFs in the water column average 991 ± 326 cells/mL and 41.4 ± 14.1 mg/m3, while in the bottom sediments they are (236 ± 61) × 103 cells/mL and 10.7 ± 4.0 μg/mL, respectively. The biomass of HNFs average 11.2% of the bacterial biomass in the water column and only 0.8% of that in the sediments. Flagellates are found to be a major factor which control the development of bacterioplankton grazing, on average, 32.3% of its daily production, whereas their impact on bacteriobenthos is insignificant, as they consume, on average, only 2.0% of its production.

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Authors and Affiliations

  1. Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, 152742, Russia

    D. B. Kosolapov, A. I. Kopylov & N. G. Kosolapova

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  1. D. B. Kosolapov
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  2. A. I. Kopylov
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  3. N. G. Kosolapova
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Correspondence to D. B. Kosolapov.

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Original Russian Text © D.B. Kosolapov, A.I. Kopylov, N.G. Kosolapova, 2017, published in Biologiya Vnutrennykh Vod, 2017, No. 2, pp. 76–87.

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Kosolapov, D.B., Kopylov, A.I. & Kosolapova, N.G. Heterotrophic nanoflagellates in water column and bottom sediments of the Rybinsk Reservoir: Species composition, abundance, biomass and their grazing impact on bacteria. Inland Water Biol 10, 192–202 (2017). https://doi.org/10.1134/S1995082917020079

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