Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem

摘要: Den entrance and emergence dates of grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem are important to management agencies that wish minimize impacts human activities on bears. Current estimates for bear denning events use data were collected from 1975–80. We update these by including obtained 1981–99. used aerial telemetry estimate week den entry determining midpoint between last known active date first denned, as well denned date. also investigated post movement patterns relative locations. Mean earliest latest determined. females began during fourth September, with 90% November. Earliest males occurred second October, December. pregnant was earlier than males. other February, out dens April. third March; May, had emerged. Male emerged females. Denning period differed among classes averaged 171 days cubs, 151 females, 131 Known tended at higher elevations and, following emergence, remained elevation until late May. Females cubs relatively close (<3 km) sites 2 weeks Timing similar previous this populations southern Rocky Mountains. Ursus 13:29–37 (2002)