Abstract
The quantitative distribution of viruses and their impact on heterotrophic bacterioplankton were studied in mesotrophic and eutrophic reservoirs of the Volga and Volga-Baltic waterway. The abundance of planktonic virus particles ranged from 9.4 × 106 to 120 × 106 ml−1 and was from 2.5 to 9 times greater than the bacterial numbers. Production of virioplankton varied from 2.1 × 106 to 132 × 106 particles (ml day)−1 and the population turnover time values were between 0.3 and 11.6 days. The maximum values of numbers and production of virio- and bacterioplankton were observed in the eutrophic Ivan’kovo reservoir. Distribution of the viruses in the Volga reservoirs depended to a significant degree on the number and activity of heterotrophic bacterioplankton. The infected bacteria accounted for 5.5–33.5% of the total bacterial abundance. Phages were an important factor of bacterial mortality. During July to September virus-induced bacterial mortality varied between 6.1 and 40.6% (20.2% on average) of daily bacterioplankton production.
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Original Russian Text © A.I. Kopylov, D.B. Kosolapov, A. E. Zabotkina, 2011, published in Mikrobiologiya, 2011, Vol. 80, No. 2, pp. 241–250.
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Kopylov, A.I., Kosolapov, D.B. & Zabotkina, A.E. Virus impact on heterotrophic bacterioplankton of water reservoirs. Microbiology 80, 228–236 (2011). https://doi.org/10.1134/S0026261711020081
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DOI: https://doi.org/10.1134/S0026261711020081