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Age‐Specific Energetics of Yellow‐Bellied Marmots
Author(s) -
Webb D. R.
Publication year - 1984
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1938044
Subject(s) - homeothermy , energetics , juvenile , basal metabolic rate , biology , energy budget , ecology , energy requirement , foraging , zoology , metabolic rate , thermoregulation , mathematics , biochemistry , statistics , regression , endocrinology
Juvenile and adult yellow—bellied marmots (Marmota flaviventris) were studied at 15 locations in the deserts and mountains of central and eastern Oregon. Maintenance of homeothermy by juveniles usually required a metabolic power output above the basal rate; adults only rarely needed to increase their power output above basal. Absolute power required per adults was greater than that for juveniles in thermoneutral environments, but juveniles required more power per animal at moderate to high wind speeds. Absolute energy requirements per animal were typically only slightly greater for adults than for juveniles and were reduced for some components of the energy budget. Juveniles foraged for longer periods per day than adults at all sites.