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Viruses in bottom sediments in a eutrophic reservoir (Ivankovo Reservoir, Upper Volga)

  • Aquatic Microbiology
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Abstract

The total number of viruses, morphological and size composition of viriobenthos, number of bacterial cells infected by viruses, number of mature phages inside bacterial cells, and virus-induced mortality of bacteriobenthos have been estimated in bottom sediments of the Ivankovo Reservoir. The total number of viriobenthos in the reservoir range from 10.3 to 83.2 (31.5 ± 6.2 on average) billion particles/cm3. The total number of virus-to-bacteria ratio in the Ivan’kovo reservoir varies between 0.3 and 1.7 (0.7 ± 0.1 on average). A positive correlation between viral and bacterial abundance is found (R = 0.61, p = 0.05). In different parts of the reservoir, viral infection of bacteria is not observed or is very low. The number of infected bacteria ranges from 1.0 to 3.5% (1.7 ± 0.2% on average) of the total viriobenthos abundance and mortality due to viral lysis accounts for 1.0–3.7% (1.8 ± 0.2% on average) of the total bacterial mortality. The number of phages found inside bacterial cells average 8 ± 1 phages/cell. Thus, a phenomenon known as “infection paradox” is observed in the Ivankovo Reservoir when, at a very high viral abundance, no viral infection of bacteria is recorded or it was very low.

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Authors and Affiliations

  1. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, 152742, Russia

    A. I. Kopylov, E. A. Zabotkina & A. V. Romanenko

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  1. A. I. Kopylov
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  2. E. A. Zabotkina
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  3. A. V. Romanenko
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Correspondence to A. I. Kopylov.

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Original Russian Text © A.I. Kopylov, E.A. Zabotkina, A.V. Romanenko, 2015, published in Biologiya Vnutrennikh Vod, 2015, No. 3, pp. 23–29.

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Kopylov, A.I., Zabotkina, E.A. & Romanenko, A.V. Viruses in bottom sediments in a eutrophic reservoir (Ivankovo Reservoir, Upper Volga). Inland Water Biol 8, 236–241 (2015). https://doi.org/10.1134/S1995082915030062

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  • DOI: https://doi.org/10.1134/S1995082915030062

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