Seasonal variation in the degu (<i>Octodon degus</i>) endocrine stress response

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dc.contributor.authorBauer, Carolyn M.
dc.contributor.authorHayes, Loren D.
dc.contributor.authorEbensperger, Luis A.
dc.contributor.authorRomero, L. Michael
dc.date.accessioned2025-01-23T21:48:27Z
dc.date.available2025-01-23T21:48:27Z
dc.date.issued2014
dc.description.abstractMany wild animals show seasonal variation in circulating levels of stress hormones. Seasonal changes in the stress response may help animals better cope with the different challenges faced during each life history stage. We determined the seasonal stress profile of wild, free-living degus in Chile. Female degus were sampled during non-breeding (January), mating/early gestation (July), late gestation (August), and lactation (1st litter-September, 2nd litter-January). Male degus were sampled during the first three time-points. We measured baseline cortisol (CORT), stress-induced CORT, and negative feedback efficacy using a dexamethasone suppression test. While we found that neither males nor females showed seasonal variation in baseline CORT or negative feedback levels, we did find significant seasonal variation in stress-induced CORT levels of both sexes. Male stress-induced CORT was lowest during mating while female stress-induced CORT was highest during late gestation and lactation. Overall, females had higher stress-induced CORT compared to males. Our data suggest that stress-induced levels of CORT are highest during periods with increased chance of stressor exposure or times of positive energy balance. Consequently, CORT responses to stress appear to be regulated according to different life history needs. (C) 2013 Elsevier Inc. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.ygcen.2013.11.025
dc.identifier.eissn1095-6840
dc.identifier.issn0016-6480
dc.identifier.urihttps://doi.org/10.1016/j.ygcen.2013.11.025
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101758
dc.identifier.wosidWOS:000330555300004
dc.language.isoen
dc.pagina.final32
dc.pagina.inicio26
dc.revistaGeneral and comparative endocrinology
dc.rightsacceso restringido
dc.subjectBaseline CORT
dc.subjectCortisol
dc.subjectNegative feedback
dc.subjectStress-induced CORT
dc.subjectThe Energy Mobilization Hypothesis
dc.subjectThe Preparative Hypothesis
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.titleSeasonal variation in the degu (<i>Octodon degus</i>) endocrine stress response
dc.typeartículo
dc.volumen197
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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