We consider the seasonal and long-term dynamics of chlorophyll content per phytoplankton biomass unit (chl./B) in Sheksna and Rybinsk reservoirs (Upper Volga region). The values of chl./B (0.10–4.5) fit into the limits given in literature. The dependence of chl./B on temperature and light conditions, nutrient contents, phytoplankton development and composition is analyzed. Growth of mean seasonal chl./B values in the Rybinsk reservoir that varied from 0.22 to 0.78 during 1969–1984 and increased up to 0.89 in 2006 was revealed.

Keywords: phytoplankton, biomass, chlorophyll, chl./B, seasonal and long-term changes, environmental factors

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