Katzman Elena A. RussiaMoscowA. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prosp., Moscow 119071, Russiaelenkz05@gmail.com Author's articles Seasonal Changes in Burrowing of the Common Hamster (Cricetus cricetus L., 1758) (Rodentia: Cricetidae) in the City Floristic Diversity of Watercourses and Temporary Reservoirs of the Ostrovtsovsky Cluster of the Volga Regional Forest-Steppe State Natural Biospheric Reserve Impacted by the European Beaver’s Expansion