The First Information about the Phytoplankton and Ecological State of the Vasyugan River (Tomsk Region)
O. P. BAZHENOVA, N. N. BARSUKOVA
Omsk State Agrarian University named after P. A. Stolypin, Omsk, Russia
Keywords: phytoplankton, species composition, taxonomic structure, biodiversity indicators, trophic status, water quality, Vasyugan River, West Siberia
Abstract
According to the results of studies of the Vasyugan River in July 2019 and 2021 the species composition, taxonomic structure, dominant complex, abundance and biomass, indices of phytoplankton biodiversity were established for the first time. 166 species and intraspecific taxa of algae from 8 divisions have been identified, green algae (Chlorophyta division) form the basis of species richness. The dominant phytoplankton complex includes centric diatoms, green algae and non-heterocyst cyanoprokaryotes. Biodiversity indices indicate high species richness, close to average complexity and evenness of the phytoplanktocenosis structure. The trophic status of the river corresponds to the eutrophic category of waters, the water quality ranges from class 3 “satisfactory purity” to class 4 “polluted”.
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