Data about specific composition, expansion and an abundance of golden algae (Chrysophyta) in the rivers and reservoirs of pool of average Irtysh is cited. In comparison with the XX century specific riches and number of golden algae have considerably increased that is connected with eutrophication and pollution by organic matters of water objects of Omsk Priirtyshye.
Keywords: Omsk Priirtyshye, Chrysophyta, specific riches, abundance, expansion
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