Impact of Viruses on Mortality of Heterotrophic Bacteria in the Rivers of Cherepovets city (Upper Volga region)
A. I. KOPYLOV1, E. A. ZABOTKINA1, T. V. IEVLEVA2
1Papanin Institute for Biology of Inland Waters RAS, 152742, Yaroslavl Region, Nekouzskiy District, Borok
2Cherepovets State University, 162612, Cherepovets, Gogolya str., 5
Keywords: viruses, bacteria, frequency of infected cells, virus-induced mortality of bacteria, small rivers
Abstract
The abundance and production of planktonic viruses, frequency of infected bacterial cells, the number of mature phages in infected bacterial cells and virus-induced mortality of bacterioplankton were studied in two small rivers and the large Sheksna River (Cherepovets city) in April – October 2011. High positive correlations were determined between the abundance of planktonic viruses and bacteria and between the number of viruses attached to bacterial cell walls and the frequency of infected bacteria. The number of planktonic viruses and the mortality of bacteria caused by virus–induced lysis in hypertrophic and eutrophic small rivers were higher than in the mesotrophic Sheksna River.
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