Taxonomic diversity and structure of phytoplankton of the Polui River (tributary of the Ob River)

Abstract

The study of the Polui River algoflora are resulted. A total of 249 taxa of species and subspecies ranks from 86 genera, 52 families and 8 divisions were identified: Cyanoprokariota, Chrysophyta, Bacillariophyta, Xanthophyta, Cryptophyta, Dinophyta, Euglenophyta, Chlorophyta. For the first time, a systematic list of algae is given, indicating the habitat, saprobicity and geographical distribution of species. The most diverse in the number of families, genera and species are the divisions Chlorophyta (41 % of the total number of taxa) and Bacillariophyta (34 %), as well as Cyanoprokariota (10 %) and Euglenophyta (9 %). Other divisions are not numerous in composition (6 %). Ten genera are leading, and 4 of them are from the Chlorophyta and Bacillariophyta divisions, 2 genera are from the Euglenophyta. Planktonic species with the presence of benthic forms, beta-mesosaprobes and cosmopolitan species predominate. Discovered cryptomonads in the modern period indicate eutrophication.