Species composition of diatoms overgrowing navigation buoys in water areas of Posiet Bay of the Sea of Japan adjacent to the Far East Marine State Nature Biosphere Reserve is studied. Totally 93 species and intraspecies taxa of diatoms from Bacillariophyceae (61), Coscinodiscophyceae (22) and Fragilariophyceae (10) are registered. 43 taxa are first cited for the reserve. Most of the coves of the Bay are characterized by high species diversity (73 species) of periphyton Bacillariophyta and the dominance of β-mezosaprobionts, indicators of moderate organic pollution. In the cove of Trinity low species diversity (24) and the predominance of α-mezosaprobionts were recorded, largely due to the influence of anthropogenic pollution caused by port of Zarubino and fish factory.

Keywords: Bacillariophyta, periphyton, navigation buoys, saprobiont, Posyet Bay, Sea of Japan

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