THE STATE OF THE FEED BASE OF THE TOBOL RIVER

Abstract

The article defines the species composition of zooplankton and benthic organisms on the Tobol river.6 stations on the Tobol river were surveyed and the development of the feed base was evaluated. 16 species of planktonic invertebrates and 30 species of benthic organisms were observed during the research period in 2020.Of the rotifers, the most widespread species is B.angularis, of the branchous –D.pulex, of the oar-footed crustaceans –M.leuckarti, which are part of the zooplankton community of all the studied sites. Of the benthic organisms, the most widespread species in the Tobol river are C.Plumosus Linnaeus and T.tibifex. In general, it should be noted that according to the development of zooplankton and zoobenthos, the Tobol river is a reservoir of a moderate feeding class and, in accordance with the "trophic scale", S.P. Kitaev belongs to α–mesotrophic reservoirs.