Characteristics of hydrobiocenoses of water bodies in the Amazar river basin

Hydrobiological studies were carried out in the basin of the Amazar River in the natural areas: the middle and lower reaches of the Amazar River, tributaries of the Krestovaya and Bolshaya Chichatka as well as in the artificially created areas: a pulp and industrial combine reservoir and a fish-passing facility in May, August, October 2018, May, October 2019 and July 2021. A total of 85 algae taxa from 6 divisions were identified. They included 6 taxa of Cyanobacteria ranked below the genus, including Bacillariophyta - 45, Chrysophyta - 8, Dinophyta - 1, Charophyta - 8, Chlorophyta - 15 and Euglenophyta - 2 and 68 invertebrate species and varieties: Rotifera - 38 species and subspecies, Cladocera - 20 species and Copepoda - 10 ones. The low development of algoflora and meiofauna of watercourses with semi-mountainous and mountainous flow patterns also caused the poverty of plankton communities in the reservoir in the first year of its formation