Phytoplankton of the Ket River (Tomsk Region)

The characteristic of the phytoplankton of the Ket River (Tomsk region) is given based on the results of studies in July 2019 and 2021. The species composition and taxonomic structure of phytoplankton were established; a complex of dominant species was identified, and the abundance, biomass and biodiversity indices of phytoplanktocenosis were calculated. Green algae (Chlorophyta) and significant number of euglenids (Euglenophyta) form the basis of phytoplankton species richness. The dominant complex is formed by centric diatoms and cyanoprokaryotes. Biodiversity indices indicate high species richness, average complexity and balanced structure of phytoplanktocenosis. Trophic status of the river corresponds to eutrophic category of waters, the water quality corresponds to class 3 "satisfactory purity".