The article presents materials about algae structure of various polygons on the Arabat Spit. There were found 30 species of algae, represented by four phyla: Cyanoprokaryota (66.7% of the total number of identified species), Bacillariophyta (13.3%), Chlorophyta (16.7%), Xanthophyta (3.3%). Distinct features of their biotopical occurrence and relation to salinity and pH-value are shown. It was investigated that list of species shows hydrophilic-amphibial features and algae grow in the conditions of variable salinity and water regimes. There were found 9 algal communities in different habitats of the researched polygons. Dominants of algal communities were cyanoprocaryotic and green algae. Cyanoprokaryota Lyngbya aestuarii formed macroscopic growth in all biotopes excepting the water column and was represented by slime and continuous film from yellow-green to black colors.

Keywords: algae, cyanoprokaryota, macroscopic growth, Arabat Spit, Azov Sea

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