Fig. 2 in Den phenology and reproductive success of polar bears in a changing climate

Fig. 2.—Examples of control charts with temperature data measured by thermistors onboard satellite collars fitted to adult female polar bears (Ursus maritimus) used to identify denning and to estimate entrance into and emergence from dens. Entrance and emergence dates were estimated as the median date between observations within and above control limits at the start and end of a denning event (shown as horizontal dashed lines).