Energy expenditure and testosterone in free-living male yellow-pine chipmunks

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dc.contributor.authorPlace, NJ
dc.contributor.authorVeloso, C
dc.contributor.authorVisser, GH
dc.contributor.authorKenagy, GJ
dc.date.accessioned2025-01-21T01:30:27Z
dc.date.available2025-01-21T01:30:27Z
dc.date.issued2002
dc.description.abstractThe onset of mating in yellow-pine chipmunks (Tamias amoenus) follows emergence from a prolonged period of energy conservation during hibernation. Energy expenditures are greatly accelerated to meet the demands of the reproductive season. When emerging from hibernation, typical male chipmunks (breeders) have enlarged testes and a high level of plasma testosterone M. However, certain males that do not participate in reproduction (nonbreeders) maintain small testes and low plasma T levels and emerge several weeks later than the breeders. The timing of the terminal arousal from hibernation and onset of mating are associated with increased plasma T levels. Experimental elevation of T levels in T amoenus outside the mating season has been associated with a decrease in body mass, further suggesting an effect of T on energy balance. To test this hypothesis, we measured daily energy expenditure (DEE) in free-living, nonbreeding male chipmunks in the presence and absence of a T-implant. We also measured DEE in breeding males when endogenous T levels were high. DEE of the nonbreeders was not affected by our manipulation of plasma T, and the DEE of breeding males did not differ from that of nonbreeders. We conclude that energy expenditure on a daily basis in male yellow-pine chipmunks is not influenced by levels of T. However, on a seasonal basis, the earlier emergence from hibernation by breeding males, which appears to be influenced by T, represents an overall seasonal energy expenditure that exceeds that of nonbreeding males. J. Exp. Zool. 292:460-467, 2002. (C) 2002 Wiley-Liss, Inc.
dc.fuente.origenWOS
dc.identifier.doi10.1002/jez.10085
dc.identifier.issn0022-104X
dc.identifier.urihttps://doi.org/10.1002/jez.10085
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96763
dc.identifier.wosidWOS:000174118500005
dc.issue.numero5
dc.language.isoen
dc.pagina.final467
dc.pagina.inicio460
dc.revistaJournal of experimental zoology
dc.rightsacceso restringido
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleEnergy expenditure and testosterone in free-living male yellow-pine chipmunks
dc.typeartículo
dc.volumen292
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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