Phytoplankton As an Indicator of the Modern Ecological State of the Novosibirsk Reservoir

Based on the materials of summer phytoplankton studies in 2016–2018, an assessment of the ecological state of the Novosibirsk Reservoir is given. A total of 292 species and intraspecific taxa (SIT) from 8 divisions have been identified; the basis of the species richness is formed by diatoms and green algae. For the first time, 96 SIT have been found in the reservoir. The dominant phytoplankton complex and its changes in the interannual aspect along the longitudinal axis of the reservoir are characterized. The trophic status of the reservoir generally corresponds to the eutrophic category of water. An analysis of the structural indicators of phytoplankton and changes in the dominant complex in comparison with the end of the 20th century shows that the process of anthropogenic eutrophication is accelerating in the reservoir.