Long-term Changes in the Fall Phytoplankton of the Pavlovskoye Reservoir

Based on the materials of studies of fall phytoplankton in 2015–2017, 2019 and 2021, the ecological state of the Pavlovskoye Reservoir was assessed. 276 species and intraspecific taxa of algae from 10 departments were identified, the basis of species richness is formed by diatoms and green algae (64% of algoflora). Analysis of the structural indicators of phytoplankton and changes in the dominant complex allows us to speak about an intensive succession of phytoplankton. Trophic status of the reservoir in the fall period generally corresponds to the mesotrophic category of waters.