STATE OF THE ZHAIYK RIVER MACROZOOBENTHOS IN 2019

The article presents an analysis of seasonal changes in the taxonomic composition, number and biomass of the macrozooentos of the YayykRiver in 2019. In the spring, summer and autumn periods everywhere there were small-leaf worms. The seasonality in the seasonal aspect from the average (spring and summer) to the low (autumn) class of feeding is shown and corresponded to the reservoirs of z-mesotrophic and oligophtropic type. It is determined that in spring, summer and autumn there were everywhere small-bristynque worms Oligochaetasp. (100% occurrence). Chironomidae chironomidae chironomide larvae were found at a frequency of 50 to 100%. Frequently observed multi-brush worms H. kowalewskii (meeting from 33 to 67%). in 2019, the taxonomic composition of the jayyk zoobentos consisted of 13 species and forms of benthic organisms from four groups: worms - 4, insects - 2, crustaceans - 2 and molluscs - 5 species. In the off-season aspect there was a fluctuation of quantitative indicators of bentos. According to the results of the studies, the average number and biomass of bottom invertebrates were in spring 1013ex./m2 and 13.0 g/m2, in summer - 910ex./m2 and 634.85 g/m2, in autumn - 1263ex./m2 and 454.88 g/m2, respectively. In zoobentos, the number of worms was determined by numbers, the share of which was 92.8% in the spring, 72.2% in the summer, and 90.3% of the average number of benthos in autumn. According to biomass, molluscs dominated, their share in the average weight of benthos was 84.4%, in summer 99.78% and in autumn 99.61%, respectively.

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