Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)

Lower Volga region

Seasonal dynamics Individual Plot Sizes of Males and Females of the American Mink (Neovison vison Schreber, 1777) in the Saratov Region

The estimation size of individual plots the American mink on the res- ervoirs in Saratov region in the period from 2000 to 2014. The average plot size of males – 30.6 hectares, females – 27.8 hectares. During the cold period on most waters plot sizes are increased almost two- fold. Found that females go farther from the center of the rivers and streams than males (females – 203.8 m; males – 166.7 m). American mink is more inclined to the rivers with wide floodplain (?2 = 26.2; p = 0.01).

Biotopical Distribution of Orve Beetles (Coleoptera, Staphylinidae) of the Lower Volga Region

The result of study of distribution of rove beetles (Coleoptera, Staphylinidae) in the main types of biotopes of the Lower Volga region during many years in the paper is given. Correlation between ecological features of the region, biotopical distribution and species composition of rove beetles is considered.

The Structure of Morphological Variability and Vitaliti in the Populations of Tulipa Gesneriana L. in the Lower Volga Region and Adjacent Territories

During four field seasons (2013–2016.) conducted a study of the structure of morphological variability and vitality. 38 populations of Tulipa gesneriana in several areas of the Lower Volga region and adjacent territories. The significant variability in the vitality structure of the populations as on the interpopulation level, and year. It is revealed that years of observation in General, most populations of the species were quite pronounced tendency for a gradual reduction of vitality. from 2013 to 2015 and significantly improve the plants in them in 2016.