Species diversity of epiphytic diatoms in Peter the Great Bay, Sea of Japan is studied. 112 species and intraspecific taxa of diatoms from Bacillariophyceae (79), Fragilariophyceae (15) and Coscinodiscophyceae (18) are revealed. 9 species for Russian water of Japan Sea first time are marked. Minimum of number species of epiphytic diatoms (50 species), increase contribution of α-mesosaprobionts (38 % from total number species) and predominance of brakishwater and marine microalgae forms (43 %) by median water salinity 21.5 ‰ were marked for powerfully pollution water areas. The background water areas are characteristically by maximum epiphytic species diversity (77), absence of α-mesosaprobionts (0 %), and increase contribution of marine microalgae forms (76 %) by water salinity 33.03 ‰. The axial thallus type has total number of epiphytic diatoms was 1.5–3 once more, then by lamellar thallus. The obtain data may draw a conclusion about more unfavorably ecological situation in present day be available in quite the coastal number water areas of Peter the Great of Sea of Japan, subjecting to chronic anthropogenic pollutions. These water areas included of Vladivostok, Nakhodka and Slavyanka ports waters and estuary type some basins.

Keywords: Bacillariophyta, epiphyton, macrophytes, pollution, saprobiont, Peter the Great Bay, Sea of Japan

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