SPATIAL DISTRIBUTION OF ZOOPERIPHYTON IN THE IRTYSH RIVER
The investigations for the first time undertaken with rheophilous zooperiphyton at 12 sections of the middle and lower stream of the Irtysh river showed presence of specific and cenotic resemblance with domination of Trichoptera larvae. The changes are connected both with pollution of certain river sections, causing simultaneous decrease of taxonomic diversity, quantity and biomass of zooperiphyton, and influence by natural modifications of hydrochemical characteristics.