STUDYING THE SPECIES STRUCTURE OF ZOOPLANKTOCENOSIS IN THE LOWER PART OF THE URAL RIVER AND DETERMINING THEIR QUANTITATIVE DEVELOPMENT

The article provides an analysis of zooplanktocenosis state of the Zhayik River. The taxonomic composition and frequency of organisms’ occurrence in two years were studied in the materials of the article. The analysis of seasonal changes in the spatial distribution of zooplankton communities of the Zhayik river were performed. As a result of research, a low trophicity class of the studied reservoir was established by the level of zooplankton productivity. Differences in the spatial distribution of zooplanktocenoses were marked. A comparative analysis of the zooplankton quantitative indicators over a number of years was given. A comparative analysis of quantitative indicators of taxa for 2018-2019 was also conducted. As a result of the analysis in 2018, among rotifers that occur in the maximum percentage of B. calyciflorus (85%) and B. B. angularis (60%) (60%). In 2019, it was found on the maximum percentage of B. calyciflorus (80%). M. brachiata, A. tonsa and Cyclops sp. the incidence was 40%. It was found that in the spring and summer seasons, the number of rotifers prevailed. The quantitative composition of zooplankton organisms in 2018 is 26.46 thousand units/m3, for biomass it was 290.96 mg / m3, in 2019 the quantitative composition was 46.84 thousand units/m3, for biomass 832.15 mg / m3. According to the results of the analysis, the most productive stations are given: lower Damba, 7 post and Balykshi.

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