[Distribution of picocyanobacteria and virioplankton in mesotrophic and eutrophic reservoirs: the role of viruses in mortality of picocyanobacteria].
The quantitative distribution and relationships of picocyanobacteria and viruses were studied in the mesotrophic Sheksna and mesoeutrophic Rybinsk reservoirs belonging to the system of the Volga-Baltic Waterway. The share of picocyanobacteria in the sum biomass and production of phytoplankton decreased along with increase in the productivity in the waterbody. However, the abundance of virioplankton increased in such conditions. The extent of infection by phages and virus-induced mortality of picocyanobacteria were two times higher on average in the mesoeutrophic reservoir compared to the mesotrophic one: 14 and 7% of the number of picocyanobacteria, 21 and 11% of daily production of picocyanobacteria, respectively. Mortality in picocyanobacteria resulted from lysis by viruses increased (up to 52% of daily production of picocyanobacteria) at the local parts where water was blooming with phytoplankton and at the parts affected by communal pollution.
A I
AI
Kopylov
D B
DB
Kosolapov
E A
EA
Zabotkina
V
V
Straskrabova
D001435:Bacteriophages / Q000502:physiology*; D018533:Biomass; D000458:Cyanobacteria / Q000821:virology*; D010839:Phytoplankton / Q000821:virology*; D014871:Water Microbiology