Comparative characteristics of the cenotic structure of phytoplankton of some tributar rivers of the Kuibyshev and Saratov reservoir

A comparative assessment of the diversity and structure of plankton algae communities in the Usa, Samara, Chapaevka, and Bezenchuk rivers was carried out. The features of the formation of algae communities are shown depending on hydrological conditions and the nature of anthropogenic activity in the catchment area. An assessment of the trophic and saprobic state of rivers based on phytoplankton is given. Mass development of the toxicogenic species Planktothrix agardhii has been registered in the lower reaches of the Chapaevka and Bezenchuk rivers.