The species diversity of diatom epiphyton of 14 species of green algae-macrophytes and periphyton of glass plates in the Crimean coast the Black Sea from 1987 to 2012 have been studied. Total 106 taxa of Bacillariophyta were found among them in epiphyton – 53, periphyton – 92, 39 species were common to the two ecotopes. The greatest number of diatoms (39 species) was found in epiphyton of Ulva rigida C. Agardh., whose density varied (1,8 to 12)·10³ cells·cm^-2 with a maximum at temperature 23° C in August. In periphyton the greatest number of diatoms (34 species) was recorded at 15° C in October with an exposure of plates during the one month, and the maximum number (1 229,3·10³ cells·cm^-2) was registered at 8° C in January. In two ecotypes were registered 58 % of marine and 34 % brackish-marine species with dominated of boreal (28 %), cosmopolites (26 %), 38 % – tropical-boreal and arctic-boreal-tropical elements. Diatoms occupation of different substrates depending on environmental factors are discussed.

Keywords: Bacillariophyta, Chlorophyta, periphyton, epiphyton, anthropogenic substrates, Black Sea

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