Comparison of reservoirs in the Moskva-Vazuza water system in terms of phytoplankton abundance and eutrophication degree

Based on the analysis of long-term data, phytoplankton biomass is shown to grow in the Vazuza-Yauza-Ruza-Mozhaisk-Ozerna series of reservoirs. The first three reservoirs (their near-dam areas) can be referred to mesotrophic water bodies and the other reservoirs, to slightly eutrophic. It has been revealed that, with an increase in the water body productivity (from the Vazuza Reservoir to the Ozerna Reservoir), the share of blue-green algae increases, while the share of diatomic algae decreases. The concentration of phosphorus in water bodies is an important factor of phytoplankton abundance.