Species composition and quantitative characteristics during year-round research of periphyton diatoms on experimental plates in hypereutrophic artificial lagoon around Vladivostok are studied. Seventy-nine species and interspecific taxa by Bacillariophyceae (58), Fragilariophyceae (6) and Coscinodiscophyceae (15) classes are revealed. Total periphyton density was varied from 0.026 to 13.9 mln cells/m², the indicators of powerfully organic water pollution α-mesosaprobionts has dominant status (80.03 %). The average annual values of species number, species diversity Shannon and evenness Pielou indexes in diatom periphyton were low (n = 9.5, H = 1.38, e = 0.39 inf. byt/m², respectively). In winter period and early spring periphyton almost have not developed, caused by influence of negative light condition in this lagoon as a result of strong over-freezing. The features of quantitative periphyton development in year-round become formed by specific physical and hydrological lagoon conditions, as well as significant eutrophication by sewage waters, contributing to mass development of power organic pollution indicators.

Keywords: lagoon, diatoms, periphyton, saprobity, eutrophication, Sea of Japan

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