Abstract
Data on the influence of a summer drought on the state of vegetation and the period of activity of the yellow ground squirrel in colonies of the Saratov Trans-Volga Yeruslan sands are presented. During the 2009 drought, the flora virtually ceased vegetating and was characterized by low rates of species diversity, projective cover, and height of herbage. Ground squirrels entered hibernation two weeks earlier than in previous years (with normal humidity). The only colony with a long period of activity in that year was near a meadow-reed estuary. The presence of green vegetation in small meadows contributed to a prolongation of the activity of ground squirrels and the usual date of the start of hibernation.
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