Structure and dynamics of Iris pseudacorus L. populations in the Samara region

The article presents the generalized results of the study of the structure and dynamics of Iris pseudacorus L. populations in the Samara region. 250 population loci in the valleys of 16 rivers flowing in the region (the Volga, Samara, Sok, Kondurcha, Bolshoy Kinel, Usa, Tisherek, Binaradka, Bezenchuk, Molochka, Chagra, Chapayevka, Syzranka, Tatyanka, Kutuluk rivers) were studied. The total registered number of individuals is about 18,000. According to the "della omega" criterion, the populations are mainly mature, three are maturing (the valleys of the Tisherek, Syzranka, Tatyanka rivers), and one is transitional (the Chapayevka river). The state of the populations is defined as unsatisfactory on the Volga, Binaradka, Molochka, Bolshoy Kinel, Chapayevka, Bolshoy Irgiz, Kutuluk rivers. Among the anthropogenic factors affecting the preservation of the species populations, it is necessary to mention the increase in recreational load, violation of the integrity of coastal aquatic vegetation and water pollution. An increase in the number of individuals was observed in the period from 2006 to about 2020, since 2020 the number of Iris pseudacorus in the Samara region began to decline.