[African wild cat (Felis lybica Forster, 1780) in the Saratov Transvolga Region].

Analysis of the area limits where African wild cat was found as well as of published data on its distribution in the Saratov Transvolga Region demonstrated that the local range of this species extended and its northwestern limit advanced almost 1000 km to the Volga zoogeographical boundary.

[Abundance of Trans-Volga population of the great bustard (Otis tarda L.)]. / Chislennost' zavolzhskoi populiatsii drofy (Otis tarda L.).

We studied the abundance, spatial structure, and democratic parameters of the Trans-Volga population of great bustard as well as this species connection to the habitats during premigratory movements. The data were obtained by monitoring a test area of 1,200,000 hectares in 1998-2000. Time-related changes in the structure of great bustard habitats in Saratov Trans-Volga Region during the 20th century are described and the mechanisms underlying the changes in this species connection to the habitats under the influence of anthropogenic factors are proposed.