Abstract
Materials of half-century observations of zooplankton in the Rybinsk Reservoir were used to establish reversible variations in its structure, abundance, and biomass and irreversible variations in the characteristics (trends). Variations with periods of ∼10 and 20 years have the largest effect on the community dynamics. Regression models are presented describing the dependence of zooplankton biomass averaged over May–October on its values in summer months and on the concentrations of chlorophyll a and phytoplankton and hydrothermal characteristics of the water body. Changes in zooplankton community under the effect of eutrophication and de-eutrophication of reservoir ecosystem are discussed.
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