Faunogenetic Structure of Birds Population and its Transformation in Connection with Depressive Changes of a Hydrological Annual Cycle in the Middle Reach of the Medveditsa River

The flood plain of the Medveditsa River in the middle current is characterised by various fauna of birds. Nowadays significant transformations of local fauna, influenced by climatic conditions and anthropogenous loadings, are observed. In the valley of the river the most significant factor influencing communities of birds is the flood mode. The purpose of the work is the birds faunogenetic structure analysis of the Mededitsa river flood plain, and also it`s dynamics under the conditions of degradation of an inundated hydrological cycle.

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 (χ2 = 26.2; p = 0.01). River with a narrow floodplain populated predator with lower density (χ2 = 15.3; p = 0.04).