Abstract
The complex of mammals on the territory of the Rostov Nature Reserve located in the arid steppes in the 20th-21st centuries was studied and the reasons for the changes that occurred in it were determined. We used the authors' observations since 1959, data from the staff of the Rostov Nature Reserve and publications on mammals. A total of 46 species of mammals were recorded. Under the influence of human activity steppe ecosystems underwent profound transformations, which led to changes in the number, distribution and importance of many mammals and to the disappearance of some and the penetration of other species here. The creation of the Rostov Nature Reserve has had a positive impact on the restoration of biocenoses. However, their composition differs from that of the mid-twentieth century. In the 21st century steppe ecosystems, including mammals, are affected by increased economic activity and climate change.
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