Seasonal dynamic of species composition, species richness (S), abundance (N), biomass (B) of periphyton diatoms and Shannon (H), Pielou (e) and Barger-Parker (D_BP) indices were studied. The experimental design implied monthly exposition of glass slides in the Karantinnaya Bay of Sevastopol (Black Sea) from December 2010 to January 2012; temperature in the sea water ranged from 7.5 to 22.5 °C. In total, 55 taxa (3 classes, 14 orders, 24 families, 49 genera) of Bacillariophyta were found; 11 species were dominant, 5 of them prevailed by abundance and 9 by biomass. The averages derived for the periphyton diatom community varied as follows: S — from 7 to 25, N — from 57·10³ to 1229·10³ cell·cm^-2, B — from 0,007 to 0.353 mg·cm^-2, H — from 1.4 to 3.3, and e — from 0.36 to 0.73, D_BP — from 17 to 17 %.

Keywords: diatoms, periphyton of glass slides, Black Sea

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