Polar bear locomotion: body temperature and energetic cost

Autor:	P. D. Watts, R. J. Hurst, P. Beckerton, M. L. Leonard, Nils Are Øritsland
Rok vydání:	1982
Předmět:	Deep body temperature Ecology Energetic cost chemistry.chemical_element Biology Atmospheric sciences Oxygen Preferred walking speed Respiration chamber chemistry Polar Animal Science and Zoology Treadmill Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Zoology. 60:40-44
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z82-005
Popis:	The metabolic response of a 190-kg polar bear was tested at four different walking speeds within a respiration chamber mounted on a treadmill. Regressions of deep body temperature and oxygen consumption as a function of walking speed were determined. Equilibrium deep body temperature increased exponentially with speed of locomotion and indicated a relative inability to dissipate metabolic heat at high walking speeds. Metabolic rate, as measured by weight-specific oxygen consumption, was also best fit by a curvilinear equation and was twice that predicted by a general equation for quadruped locomotion. The apparent inefficiency of locomotion in polar bears suggests a compromise between thermoregulation, hunting strategies, and economy of transport.
Databáze:	OpenAIRE
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