Abstract
Based on field research during one winter and two summer periods of 2007, 2010 and 2018, the number and ratio of photosynthetic pigments of the lake phytoplankton were studied. High content of Chl-a in water, which corresponded to the level of hypereutrophic water bodies in all periods, was revealed. In summer, high abundance of phytoplankton was characteristic of the open part of the lake. Algae communities in overgrown areas are moderately developed, and their pigment composition is more diverse. The study of pigment characteristics of phytoplankton after lake reclamation in 2018 revealed almost complete absence of living algae. During this period, the water suspension contained sedimentary plant pigments of sapropel with a maximum concentration of Chl-a in water – 237 mg/m3. The lake water quality in terms of Chl-a content in all periods corresponded to class 4 (polluted).
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