Seasonal dynamics of phytoplankton indicators of the Zaporizhzhia (Dnipro) reservoir phytoplankton of the Zaporozhye reservoir
At present, the Zaporizhzhia (Dnipro) reservoir is exposed to increased anthropogenic pressure, intensive blue-green algae blooming and persistent eutrophication processes. Being the primary component of the ecosystem, phytoplankton responds to such changes first. The analysis of seasonal dynamics of phytoplankton allows us to assess the state of the aquatic ecosystems and the impact of anthropogenic activity on water bodies. The studies on phytoplankton during the vegetative season of 2019 have revealed that there is a seasonal distribution of the phytoplankton by the number of species, abundance and biomass in the Zaporizhzhia (Dnipro) reservoir. However, blue-green algae remain the dominant group in the surface layer of water. The maximum and minimum values of Shannon index in May, August and September at different regions. Best and worst areas in terms of water quality based on Shanon index, abundance and biomass parameter were the Monastyrsky island and Samara Bay, respectively.