Summary
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. Inclusion of heat stress into estimates of environmental harshness drastically reduced the differences in available foraging time between high elevation and low elevation sites.
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Webb, D.R. Environmental harshness, heat stress, and Marmota flaviventris . Oecologia 44, 390–395 (1979). https://doi.org/10.1007/BF00545243
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DOI: https://doi.org/10.1007/BF00545243