Transformation of Planktonic Assemblages in a Severely Stressed Cooling Reservoir

The results of long-term studies in the cooling reservoir of the Kharanorskaya SDPP (Transbaikalia) are presented, conventionally divided into four periods depending on the increase in power plant capacity. The stages of phyto- and zooplankton development determined by the influence of technogenic and biotic factors are determined. The response of plankton communities to changes in heat load is shown. Periods of intensive vegetation of algae and mass development of invertebrates alternate with a significant decline in the number and biomass of hydrobionts, which indicates an unstable state of the forming cooling pond technoecosystem.