Environmental harshness, heat stress and Marmota flaviventris [Dureté environnementale, stress calorique et M. flaviventris].

Résumé

Yellow-bellied marmots (Marmota flaviventris) were studied at three sites in central Oregon. Juveniles substantially reduced their foraging activity when equivalent black-body temperatures exceeded their upper critical temperature. lnclusion of heat stress into estimates of environmental harshness drastically reduced the differences in available foraging time between high elevation and low elevation sites.