One hundred fourty-one species of algae have been found in the coastal waters of the Zmiinyi Island. 130 species of them were registered in microphytobenthos of the water area, but 11 species in overgrowning of stones near stream on the island. Many of the species found belong to diatoms (118 species), blue-green algae (16) and green (3) algae. One species of diatoms Caloneis molaris (Grunow) Krammer and one variation Planothidium minutissimum var. affinis (Grunow) Bukht. were new for the water area of the Black Sea. In relation to substrates of algae was as follows: silt (91 species), mussel shells (83), macrophytes (43), sand (17), stones(15). Algal flora of the coastal waters of the Zmiinyi Island is a brackish-marine, alkaliphiles and β-mesosaprobic.
Keywords: algae, cyanobacteria, species diversity, new records, Zmiinyi Island, Black Sea
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