Effect of Environmental Conditions on the Composition of Zooplankton in the Middle Stream of the Likhoborka River

The relevance is due to the paucity of official data on the state of surface water ecosystems In Rusia in terms of hydrobiological indicators and the prospects for the development of hydrobiological research as part of engineering and environmental surveys. The aim of the work is to continue the research of the ecological conditions of the Likhoborka basin with the identification of spatial and temporal patterns in the state of zooplankton. The objectives of the work were: to assess the study of the Likhoborka aquatic ecosystem; to perform a comprehensive environmental survey with plankton sampling and hydrobiological analyses; to link the values of water quality indicators along the length of the river to sources of pollution. The article presents the results of an ecological survey of the Likhoborka river watershed: a list of pollution sources, methods of reconnaissance, detailed examination and hydrobiological analysis of samples taken in the middle stream in June 2022. The work is the next stage of the educational environmental monitoring of the water protection zones of the rivers of Moscow. Throughout the surveyed area from the Golovinsky Ponds to Dmitrovskoe Highway, the degree of water pollution according to the Pantle and Buck index is moderate. Daphnia are abundant in Golovinsky ponds. Along the length of the area, rotifers predominate. The total salinity increases from 185 to 821 mg/l. The greatest contribution to pollution is made by polluted waters of the Likhoborka and the Norishka, which are concentrated through the reservoirs. There are practically no living hydrobionts in the Likhoborka reservoir.