Abstract
The population of small mammals in different areas of the Saratov Trans-Volga region features long-term and constantly increasing numbers of Sylvaemus uralensis, and its wide distribution in a variety of habitats. The maximum density of S. uralensis is 72.0 ind. per 100 trap-days and the fraction in catches is 73.0%. A tendency is observed to an increasing numbers of Microtus arvalis. It is shown that after a prolonged depression in 2012-2013, Lagurus lagurus appeared in the steppe, on fallow lands and fields, the average density of species being 4.0 ind. per 100 trap-days. A high abundance of other typical steppe dwellers (Allocricetulus eversmanni and Ellobius talpinus) is noted as well. The highest indices of specific diversity (H = 1.18) are characteristic of fallow land.
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