Distribution of viruses in the water column of the ice-covered Rybinsk Reservoir and their contribution to heterotrophic bacteria mortality


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Resumo

Virioplankton and bacterioplankton abundance has been determined in the pelagic and littoral zones of the Rybinsk Reservoir during the ice-covered period. The role of viruses in heterotrophic bacterioplankton infection and mortality is assessed. At water temperatures between 0.3 and 0.9°C, the number of planktonic virus particles and planktonic bacteria varies from 37.1 × 106 to 84.1 × 106 particles/mL, (57.3 ± 2.1) × 106 particles/mL on average and from 2.50 × 106 to 6.11 × 106 cells/mL, (3.66 ± 0.16) × 106 cells/mL on average, respectively. The ratio of the virus number to the bacteria number varies from 8.8 to 27.9, being 16.5 ± 0.7 on average. Visually infected cells comprise 0.3–0.5% (1.5 ± 0.2% on average) of the total number of bacterioplankton. Infected bacterial cells contain from 5 to 107 (17 ± 4 on average) mature virus particles. The average virus-induced mortality of bacteria accounts for 13.0 ± 1.9% (variations range from 2 to 55%) of the daily bacterial production, indicating that viruses play an important role in the regulation of bacterioplankton production and abundance in the Rybinsk Reservoir during the ice-covered period.

Sobre autores

A. Kopylov

Papanin Institute for Biology of Inland Waters

Autor responsável pela correspondência
Email: kopylov@ibiw.yaroslavl.ru
Rússia, Borok, Yaroslavl oblast, 152742

D. Kosolapov

Papanin Institute for Biology of Inland Waters

Email: kopylov@ibiw.yaroslavl.ru
Rússia, Borok, Yaroslavl oblast, 152742

E. Zabotkina

Papanin Institute for Biology of Inland Waters

Email: kopylov@ibiw.yaroslavl.ru
Rússia, Borok, Yaroslavl oblast, 152742

T. Maslennikova

Papanin Institute for Biology of Inland Waters

Email: kopylov@ibiw.yaroslavl.ru
Rússia, Borok, Yaroslavl oblast, 152742

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