Ecological Analysis of Cyanoprokaryotes of the Svalbard Archipelago.

An analysis of the ecological characteristics of cyanobacteria of the Svalbard Archipelago was carried out. Two groups of habitats (aquatic and terrestrial ones) were identified. The degree of water saturation was the main factor determining the development of cyanobacteria. The variability of habitats can be represented as a gradient of moisture from typically aquatic to subaerophytic and dry terrestrial habitats. Based on the number of finds and species richness, the most favorable habitats for cyanobacteria in Svalbard were as follows: (1) rocky communities under conditions of sufficient moisture, (2) exposed soil surfaces on which biological soil crusts were formed, (3) well-warmed slow streams, and (4) specific waterlogged habitats, such as seepages. Using the example of the analysis of the ecological characteristics of species growing on the archipelago, the concept of eurybiont properties of cyanobacteria was shown to be inconsistent. The greatest plasticity was exhibited by Nostoc commune Vauch. ex Born. et Flah., Microcoleus autumnalis (Trev. ex Gom.) Strunecky et al.,Calothrix parietina Thur. ex Born. et Flah., Oscillatoria tenuis C. Ag. ex Gom., and Pseudanabaena frigida (Fritsch) Anagn. All species, including those mentioned above, had obvious ecological preferences. An analysis of the substrate specificity of cyanprokaryotes indicated that the greatest number of their species was found in soil, rocky substrates, and moss-like environments. [ABSTRACT FROM AUTHOR]