The Trophic Relationships Between Planktonic Bacteria, Heterotrophic Nanoflagellates and Viruses in a Mesoeutrophic Reservoir
A. I. KOPYLOV, D. B. KOSOLAPOV, E. A. ZABOTKINA, N. G. KOSOLAPOVA
Papanin Institute for Biology of Inland Waters, RAS, 152742, Yaroslavl region, Borok
Keywords: планктонные бактерии, гетеротрофные нанофлагелляты, вирусы, трофические взаимоотношения, planktonic bacteria, heterotrophic nаnoflagellates, viruses, trophic relationshiрs
Abstract
In the paper the following parameters were determined for the mesoeutrophic Rybinsk Reservoir: the abundance, biomass and production (PB) of bacterioplankton; taxonomic composition, abundance and biomass of heterotrophic nanoflagellates (HNF) and the rate of consumption of the HNF bacteria; the number of virioplankton, frequency of visible bacteria-infected cells, virus-induced mortality of bacterioplankton and viral production. Death rate of the bacteria due to viral lysis (7.8–34.1 %, on average — 17.2 ± 2.0 % of the daily PB) was lower than the consumption of the bacteria by the HNF community (15.4-61.3 %, on average — 32.0 ± 4.2 % of the daily PB). HNF, while consuming bacteria, simultaneously absorbed a significant number of viruses residing on the surface and inside the bacterial cells.
|
