Iris pumila L. and the State of Its Populations in the Samara Region (Southeast of the European Part of Russia)

Abstract

The current state of the coenotic populations of Iris pumila L. (Iridaceae) were studied in the southeast of the European part of Russia (Samara Region). The phytocenotic confinement and population structure of the species were assessed. I. pumila preferred growing in steppe zonal communities. In total, 118 species of vascular plants were found in the communities, where I. pumila has been registered, and of which 34 (28.8%) were included into the Red List of the Samara Region and 8 species into the Red List of the Russian Federation. In the study area, populations of I. pumila were represented by a significant number of individuals and were in a stable state. According to the “delta-omega” criterion, the populations were mature (47.0%), transitional (23.5%), maturing (17.6%), and aging (11.9%), which testified to the diversity of population structure and thus to a satisfactory state of the species in the Samara Region. The populations recovered mainly due to individuals of vegetative origin, but this process was rather slow. Under unfavorable conditions, I. pumila populations were characterized by a vegetative settled way of life. Fires, grazing, and destruction of habitats had a significant impact on the population structure and absolute abundance in the Samara Region.