Abstract
This paper presents the results of studies of phyto- and zoop-lankton communities in reser-voirs of the Kharanorskaya SDPP cooling system (cooling pond, water supply and drai-nage channels), conducted in April, July and October of 2019. Long-term changes in the diversity and structure of planktonic associations during 1995–2019 are analyzed. A total of 141 taxa of algae ranked below the genus level and 52 taxa of invertebrates are identified in plankton. The phytoplankton total abundance and total biomass changed from 20 to 742×103 cells/l and from 65 to 711 mg/m3; zooplankton, from 7 to 212×103 ind./m3 and from 0.01 to 2.7 g/m3. The greatest abundance of algae was observed in summer and autumn, invertabrates – in spring and summer. Long-term observations of planktonic biocenoses show an increase in the species richness of diatoms and rotifers and a decrease in green algal and chrysophyts. Also there is a tendency towards a decrease in the phyto- and zooplankton total abundance as the abundance of cyanophytes, green algal, rotifers and cladocerans increases.
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