Data about species composition, distribution and abundance of Cyanoprokaryota in plankton of rivers and lakes of the middle portion of Irtysh River (Omsk Priirtyshye) are presented. A brief floristic analysis and ecological and geographical characteristics of the found species are given. In water bodies of Omsk Priirtyshye cyanoprokaryotes have high species diversity and abundance. In summer-autumn period water blooms caused by cyanoprocaryotes including toxic species were recorded in many reservoirs.
Keywords: Omsk, Irtysh River, Cyanoprokaryota, species richness, distribution, abundance
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