Life strategy of cyanobacterial-algal groups in the extreme habitat establishment

Abstract

Background. To reveal the possibilities of using the life strategy of cyanobacterial- algal groups in the development of extreme habitats as an indicator of the course of different types of primary xeropesammo-lithophilic successions. Materials and methods. The collection of samples were carried out according to the generally accepted algological method. Results. The floristic analysis revealed 4 divisions, 11 classes, 15 orders, 29 families, 47 genera and 78 species. As expected, cyanobacterial occupy the first place on all substrates (60 % of all flora). At the species level, the coefficients of similarity and inclusion measures showed a weak degree of affinity between the floras of the studied substrates. The indicators of the degree of formation of these formations are the spectra of dominants, their abundance, and spectra of morphotypes, ccurrence of species, phytocenotic load and other indicators. It was revealed that about 23 % of the flora are dominants, but they are quite substrate-specific. It is noted that at the initial stages of development, the dispersed distribution of algae and cyanobacteria prevails. With the appearance of lichens and even more so mosses, the distribution of algae becomes “aggregating”. For each type of substrate, its own model of development and formation of probiogeocenosisis built. Conclusions. The process of primary development of rocks and sandy soil (loose and overburden sands) by cyanobacterial-algal flora in different regions of Russia: Northeast of Asian Russia and Western Siberia is described. The specificity of the course of primary successions has been clarified, different models of the course of successions have been established, which will make it possible to judge the life strategies and the different nature of the phytocenotic organization of cyanobacterial-algal groups, as the initial stage of the formation of probiogeocenoses in the outer habitats.

Keywords

• cyanobacterial-algal groups
• life strategy
• sand
• rock formations
• northeast asia
• western siberia