Ecological status of bats (Chiroptera) in winter roosts in eastern Fennoscandia

Data of field observations on bats hibernating in the Republic of Karelia (61°–63° N, 30°–36° E) are presented. Various bat winter roosts have been surveyed to reveal the species composition of the animals, the pattern of their spatial arrangement, mortality, and specific regional features and general trends of their hibernation. The results provide a more integrated feature of ecological adaptations of these mammals to the conditions of the North.