Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits

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dc.contributor.authorNavarrete, Lucas
dc.contributor.authorBozinovic, Francisco
dc.contributor.authorPena-Villalobos, Isaac
dc.contributor.authorContreras-Ramos, Carolina
dc.contributor.authorSanchez-Hernandez, Juan C.
dc.contributor.authorNewsome, Seth D.
dc.contributor.authorNespolo, Roberto F.
dc.contributor.authorSabat, Pablo
dc.date.accessioned2025-01-20T22:03:08Z
dc.date.available2025-01-20T22:03:08Z
dc.date.issued2021
dc.description.abstractPredictions indicate that birds worldwide will be affected by global warming and extreme climatic events which is especially relevant for passerines because the diurnal habits, small body size, and high mass-adjusted metabolic rates of this group make it particularly susceptible to increases in temperature and aridity. Some bird species respond to conditions that stress osmoregulation by increasing their rates of energy expenditure, nevertheless, the effect of dehydration on metabolic rates in birds has produced contrasting results. It also remains unknown whether hydration state may cause shifts in tissue-specific metabolic rates or modify tissue oxidative status. We used the rufous-collared sparrow (Zonotrichia capensis), to experimentally test the effect of dehydration on metabolic enzymes in erythrocytes, tissue oxidative status, basal metabolic rate (BMR), and total evaporative water loss. We found a significant increase in mass-adjusted BMR in water restricted (WR) birds compared to control birds (CT). Activity of cytochrome-c-oxidase (COX) in red blood cells (RBCs) was also significantly higher in the WR group relative to the CT group and this activity was positively correlated with mass-adjusted BMR. We found a moderate effect of water restriction on membrane damage of skeletal muscle. In a second set of individuals subjected to the same experimental conditions, lean mass and total water were tightly correlated and decreased by 10 and 12%, respectively, in birds in the WR group relative to the CT group. Decreases in total water and lean mass leads to an increase in mass-adjusted BMR in WR Z. capensis, suggesting that birds may simultaneously increase protein catabolism and production of metabolic water through oxidation. The significant positive relationship between BMR and COX in RBCs is a finding that requires additional research to determine whether erythrocyte metabolism is affected by dehydration per se and or it more generally reflects rates of energy expenditure in birds.
dc.fuente.origenWOS
dc.identifier.doi10.3389/fevo.2021.767280
dc.identifier.issn2296-701X
dc.identifier.urihttps://doi.org/10.3389/fevo.2021.767280
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94020
dc.identifier.wosidWOS:000741407100001
dc.language.isoen
dc.revistaFrontiers in ecology and evolution
dc.rightsacceso restringido
dc.subjectbasal metabolic rate (BMR)
dc.subjectbody composition
dc.subjectmetabolic enzymes
dc.subjectoxidative stress
dc.subjectbirds
dc.subjectdehydration
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.titleIntegrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
dc.typeartículo
dc.volumen9
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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