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

Predictions 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 temp...

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Autores principales:	Lucas Navarrete, Francisco Bozinovic, Isaac Peña-Villalobos, Carolina Contreras-Ramos, Juan C. Sanchez-Hernandez, Seth D. Newsome, Roberto F. Nespolo, Pablo Sabat
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	basal metabolic rate (BMR) body composition metabolic enzymes oxidative stress birds dehydration Evolution QH359-425 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/fbec52e8daac4b1eaa613a45992ee055
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spelling	oai:doaj.org-article:fbec52e8daac4b1eaa613a45992ee0552021-11-17T16:56:58ZIntegrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits2296-701X10.3389/fevo.2021.767280https://doaj.org/article/fbec52e8daac4b1eaa613a45992ee0552021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fevo.2021.767280/fullhttps://doaj.org/toc/2296-701XPredictions 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.Lucas NavarreteLucas NavarreteFrancisco BozinovicIsaac Peña-VillalobosIsaac Peña-VillalobosCarolina Contreras-RamosCarolina Contreras-RamosCarolina Contreras-RamosJuan C. Sanchez-HernandezSeth D. NewsomeRoberto F. NespoloRoberto F. NespoloRoberto F. NespoloPablo SabatPablo SabatFrontiers Media S.A.articlebasal metabolic rate (BMR)body compositionmetabolic enzymesoxidative stressbirdsdehydrationEvolutionQH359-425EcologyQH540-549.5ENFrontiers in Ecology and Evolution, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	basal metabolic rate (BMR) body composition metabolic enzymes oxidative stress birds dehydration Evolution QH359-425 Ecology QH540-549.5
spellingShingle	basal metabolic rate (BMR) body composition metabolic enzymes oxidative stress birds dehydration Evolution QH359-425 Ecology QH540-549.5 Lucas Navarrete Lucas Navarrete Francisco Bozinovic Isaac Peña-Villalobos Isaac Peña-Villalobos Carolina Contreras-Ramos Carolina Contreras-Ramos Carolina Contreras-Ramos Juan C. Sanchez-Hernandez Seth D. Newsome Roberto F. Nespolo Roberto F. Nespolo Roberto F. Nespolo Pablo Sabat Pablo Sabat Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
description	Predictions 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.
format	article
author	Lucas Navarrete Lucas Navarrete Francisco Bozinovic Isaac Peña-Villalobos Isaac Peña-Villalobos Carolina Contreras-Ramos Carolina Contreras-Ramos Carolina Contreras-Ramos Juan C. Sanchez-Hernandez Seth D. Newsome Roberto F. Nespolo Roberto F. Nespolo Roberto F. Nespolo Pablo Sabat Pablo Sabat
author_facet	Lucas Navarrete Lucas Navarrete Francisco Bozinovic Isaac Peña-Villalobos Isaac Peña-Villalobos Carolina Contreras-Ramos Carolina Contreras-Ramos Carolina Contreras-Ramos Juan C. Sanchez-Hernandez Seth D. Newsome Roberto F. Nespolo Roberto F. Nespolo Roberto F. Nespolo Pablo Sabat Pablo Sabat
author_sort	Lucas Navarrete
title	Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
title_short	Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
title_full	Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
title_fullStr	Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
title_full_unstemmed	Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits
title_sort	integrative physiological responses to acute dehydration in the rufous-collared sparrow: metabolic, enzymatic, and oxidative traits
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/fbec52e8daac4b1eaa613a45992ee055
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Integrative Physiological Responses to Acute Dehydration in the Rufous-Collared Sparrow: Metabolic, Enzymatic, and Oxidative Traits

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