New data on the species composition of freshwater algae and cyanobacteria of Kotelny Island, New Siberian Islands, Russian Federation

New data are obtained on the species composition of algae (excluding diatoms and silicascaled chrysophytes) and cyanobacteria in water bodies of Kotelny Island of the New Siberian Archipelago. A species list is provided for the 12 studied water bodies of the island, including 124 species and varieties. A taxonomic revision of the previously existing species list based on collections carried out on the island in 1947 is accomplished and combined with new data. The general species list contains 233 taxa, including 93 new species and varieties. A relatively high diversity of desmid algae has been established. The studied communities are characterized by a large number of cosmopolitan forms, a predominance of attached organisms and eurythermal species, as well as species indiff erent to the water fl ow speed. The trophic status of the studied water bodies of the island, the degree of their mineralization and the pH level of the environment are characterized using algal indication.