Bioindication of the ecosystem of lake Bolshoe Glubokoe (Kazan) by composition and structure of phytoplankton

The results of a study of summer phytoplankton in Bolshoe Glubokoe Lake, located in a specially protected natural area of the Lebyazhye Urban Forest Park (Kazan, Republic of Tatarstan), are presented. The structural and quantitative indicators of summer algocenoses have been determined. Using indicator parameters of phytoplankton, the saprobiological state of the lake and its trophic status were determined.