Home – Home – Jornals – Contemporary Problems of Ecology 2019 number 5

The composition and ecological-geographical features of the rarest endemic species of vascular plants of Siberia, including 50 species, known so far only from the classical location (the so-called stenoendemics) are considered. Their share is about 1 % of the flora of vascular plants of Siberia. For the first time, according to the floristic zoning, the composition of the chorological groups of the stenoendemics of Siberia has been established. The zones of concentration of their ranges are determined. The largest number of species studied (23) is concentrated in the Altaic Siberian ecoregion. A significant number of stenoendemic species are also represented in the Baikal Siberian (10) and West Siberian (8) regions. It has been quantitatively proved that the conditions for the existence of stenoendemics are most favorable in Southern Siberia. The mountain systems of Altai and Sayan provide the most diverse spectra of habitats for the successful implementation of microevolutionary processes, as well as the level of isolation sufficient to isolate new species. To determine the environmental conditions conducive to the processes of speciation, the grouping of the studied species according to their belonging to floristic complexes was carried out. More than a third of the studied species of the Altaic Siberian ecoregion (9 out of 23) are confined to the high-mountain floristic complex. Stenoendemics of the forest floristic complex are concentrated in the Altaic Siberian and West Siberian ecoregions and form a grouping comparable in value to the types of the high-mountain floristic complex. In the Baikal Siberia, species of the steppe floristic complex predominate, which is due to the diversity of the steppe areas and their insular character. It has been established that the level of state protection of the studied species is unacceptably low, since none of them are listed in the Red Book of the Russian Federation. To assess the degree of study and the prospects for further research on endemic species, a methodology for their ranking by quantitative indicators has been developed and tested. The recommendations presented in the article should be the basis for consideration of questions on the inclusion of the studied endemic species of vascular plants of Siberia into the lists of rare and endangered plants of the Russian Federation.