Lithobiotic cyanobacteria diversity of the Karelian Isthmus

This work presents data obtained as a result of studying the composition of cyanobacteria in lithobiotic communities on various substrates (Ruskeala marble, rapakivi-granite, granite gneiss) in different light conditions on the territory of the Karelian Isthmus: Leningrad Oblast, Republic of Karelia, and South Finland. The species composition of cyanobacteria was revealed, and the species composition on certain types of substrates was analyzed. A total of 49 species of cyanobacteria were noted for the Republic of Karelia (13 of which were not previously recorded in this territory). The detailed taxonomic and environmental characteristics of species are given. Changes in the species diversity of cyanobacteria in connection with specific habitats are shown. The type of substrate, the degree of moisture, and illumination are noted as the main factors determining the diversity of cyanobacteria in lithobiotic communities.