Physiological responses in rufous-collared sparrows to thermal acclimation and seasonal acclimatization

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dc.contributor.authorMaldonado, Karin Evelyn
dc.contributor.authorCavieres, Grisel
dc.contributor.authorVeloso, Claudio
dc.contributor.authorCanals, Mauricio
dc.contributor.authorSabat, Pablo
dc.date.accessioned2025-01-21T00:09:21Z
dc.date.available2025-01-21T00:09:21Z
dc.date.issued2009
dc.description.abstractA large number of physiological acclimation studies assume that flexibility in a certain trait is both adaptive and functionally important for organisms in their natural environment; however, it is not clear how an organism's capacity for temperature acclimation translates to the seasonal acclimatization that these organisms must accomplish. To elucidate this relationship, we measured BMR and TEWL rates in both field-acclimatized and laboratory-acclimated adult rufous-collared sparrows (Zonotrichia capensis). Measurements in field-acclimatized birds were taken during the winter and summer seasons; in the laboratory-acclimated birds, we took our measurements following 4 weeks at either 15 or 30A degrees C. Although BMR and TEWL rates did not differ between winter and summer in the field-acclimatized birds, laboratory-acclimated birds exposed to 15A degrees C exhibited both a higher BMR and TEWL rate when compared to the birds acclimated to 30A degrees C and the field-acclimatized birds. Because organ masses seem to be similar between field and cold-acclimated birds whereas BMR is higher in cold-acclimated birds, the variability in BMR cannot be explained completely by adjustments in organ masses. Our findings suggest that, although rufous-collared sparrows can exhibit thermal acclimation of physiological traits, sparrows do not use this capacity to cope with minor to moderate fluctuations in environmental conditions. Our data support the hypothesis that physiological flexibility in energetic traits is a common feature of avian metabolism.
dc.description.funderFondecyt
dc.fuente.origenWOS
dc.identifier.doi10.1007/s00360-008-0317-1
dc.identifier.eissn1432-136X
dc.identifier.issn0174-1578
dc.identifier.urihttps://doi.org/10.1007/s00360-008-0317-1
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95705
dc.identifier.wosidWOS:000264484100011
dc.issue.numero3
dc.language.isoen
dc.pagina.final343
dc.pagina.inicio335
dc.revistaJournal of comparative physiology b-biochemical systems and environmental physiology
dc.rightsacceso restringido
dc.subjectEnergetics
dc.subjectWater economy
dc.subjectPhysiological flexibility
dc.subjectPasserines
dc.subjectSeasonality
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.titlePhysiological responses in rufous-collared sparrows to thermal acclimation and seasonal acclimatization
dc.typeartículo
dc.volumen179
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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