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Pre-basic molt, feather quality, and modulation of the adrenocortical response to stress in two populations of rufous-collared sparrows Zonotrichia capensis

dc.contributor.authorEcheverría V.
dc.contributor.authorEstades C.F.
dc.contributor.authorBotero-Delgadillo E.
dc.contributor.authorWingfield J.C.
dc.contributor.authorGonzález-Gómez P.L.
dc.date.accessioned2020-09-02T22:17:15Z
dc.date.available2020-09-02T22:17:15Z
dc.date.issued2018
dc.identifier10.1111/jav.01892
dc.identifier.citation49, 11, -
dc.identifier.issn09088857
dc.identifier.urihttps://hdl.handle.net/20.500.12728/4371
dc.descriptionMolt is an energetically expensive process in which birds may allocate 25% or more of their body protein mass to the production of new feathers. Stressful events can interfere with feather growth via the adrenal hormone corticosterone, which is released in response to environmental stress. Corticosterone release, in turn, regulates gluconeogenesis which could directly inhibit protein synthesis and deposition during molt when feathers are growing, which potentially could reduce feather quality dramatically. Thus, many species suppress the adrenocortical stress response, and therefore maintain lower corticosterone levels during molt. In this study we assessed the relationship between plasma corticosterone levels and feather quality in rufous-collared sparrow inhabiting the valleys of the Atacama Desert – one of the most stable and aseasonal environments in the world, and in the semiarid and seasonal Fray Jorge National Park in the north of Chile. We tested two hypotheses; 1) feather quality is positively related to the amount of corticosterone suppression during molt, relative to corticosterone levels during other life history stages; and, 2) feather quality is negatively related to the absolute levels of corticosterone. We found negative associations between corticosterone levels and feather quality. However, these effects were stronger in the Atacama Desert where birds showed minimal corticosterone suppression and overall low feather quality. Although we found better feather quality in Fray Jorge, corticosterone suppression in these birds was relatively low in comparison with other species inhabiting higher latitudes. It is possible that birds in a highly variable environment face a stronger trade-off between feather quality and the stress-response. Our results suggest that the strength of the trade-off between feather quality and corticosterone levels could be dependent on energetic demands, seasonality, and unpredictable events. © 2018 The Authors
dc.language.isoen
dc.publisherBlackwell Publishing Ltd
dc.subjectcorticosterone
dc.subjectenvironmental heterogeneity
dc.subjectseasonality
dc.subjectenvironmental stress
dc.subjectfeather
dc.subjectgrowth
dc.subjectheterogeneity
dc.subjecthormone
dc.subjectlife history
dc.subjectpasserine
dc.subjectseasonality
dc.subjectsemiarid region
dc.subjecttrade-off
dc.subjectAtacama Desert
dc.subjectBosque Fray Jorge National Park
dc.subjectChile
dc.subjectCoquimbo
dc.subjectAves
dc.subjectPasseridae
dc.subjectZonotrichia capensis
dc.titlePre-basic molt, feather quality, and modulation of the adrenocortical response to stress in two populations of rufous-collared sparrows Zonotrichia capensis
dc.typeArticle


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