Comparative responses of sea level and montane rufous-collared sparrows, Zonotrichia capensis, to hypoxia and cold

Castro, Gonzalo; Carey, Cynthia; Whittembury, J; Monge, Carlos

doi:10.1016/0300-9629(85)90493-1

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…Individuals collected at 4500 m a.s.l. have significantly lower critical temperatures (the temperature at which metabolic resources must be used to maintain constant body temperature) than those collected at sea level, consistent with adaptation to cold, high‐altitude habitats (Castro 1983; Castro et al . 1985; Castro & Wunder 1990).…”

Section: Introductionmentioning

confidence: 60%

“…This response is often mediated by an increase in metabolic rate, and thermogenic capacity has been shown to be under natural selection in high‐altitude deer mice ( Peromyscus maniculatus ) (Hayes & O’Connor 1999). High‐altitude rufous‐collared sparrows have significantly greater cold tolerance than those from coastal populations (Castro 1983; Castro et al . 1985; Castro & Wunder 1990), suggesting cold adaptation that could be mediated through increased metabolic thermogenic capacity.…”

Section: Discussionmentioning

confidence: 99%

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Transcriptomic variation and plasticity in rufous‐collared sparrows (Zonotrichia capensis) along an altitudinal gradient

2008

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As modern genomic tools are developed for ecologically compelling models, field manipulation experiments will become important for establishing the role of functional genomic variation in physiological acclimation and evolutionary adaptation along environmental clines. High-altitude habitats expose individuals to hypoxic and thermal stress, necessitating physiological acclimation, which may result in evolutionary adaptation. We assayed skeletal muscle transcriptomic profiles of rufous-collared sparrows (Zonotrichia capensis) distributed along an altitudinal gradient on the Pacific slope of the Peruvian Andes. Nearly 200 unique transcripts were differentially expressed between high-altitude [4100 m above sea level (a.s.l.)] and low-altitude (2000 m a.s.l.) populations in their native habitats. Gene ontology and network analyses revealed that these transcripts are primarily involved in oxidative phosphorylation, protein biosynthesis, signal transduction and oxidative stress response pathways. To assess the plasticity in gene expression differences between populations, we performed a 'common garden' experiment in which high- and low-altitude individuals were transferred to a common low-altitude site (approximately 150 m). None of the genes that were differentially expressed between populations at the native altitudes remained significantly different between populations in the common garden. The role of gene expression variation in adaptation and acclimation to environmental stress is largely unexplored in natural populations of birds. These results demonstrate substantial plasticity in the biochemical pathways that underpin cold and hypoxia compensation in Z. capensis, which may mechanistically contribute to enabling the broad altitudinal distribution of the species.

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Section: Introductionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Transcriptomic variation and plasticity in rufous‐collared sparrows (Zonotrichia capensis) along an altitudinal gradient

2008

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“…The cold, hypoxic conditions of high elevation habitats impose severe physiological stress on endothermic vertebrates, and populations of Z. capensis occurring at different elevations along the Pacific slope in Peru differ in physiological parameters that are likely to be adaptive. Individuals collected at 4500 m asl have significantly higher metabolic rates and reduced lower critical temperatures (the temperature at which metabolic resources must be used to maintain constant body temperature) than those collected at sea level, consistent with local adaptation to cold, high elevation habitats (Castro 1983; Castro et al 1985; Castro and Wunder 1990).…”

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confidence: 64%

MIGRATION-SELECTION BALANCE AND LOCAL ADAPTATION OF MITOCHONDRIAL HAPLOTYPES IN RUFOUS-COLLARED SPARROWS (ZONOTRICHIA CAPENSIS) ALONG AN ELEVATIONAL GRADIENT

2009

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“…The pekin duck also appears to decrease T b in hypoxia (Faraci et al, 1984; Scott et al, 2008), but this has not been consistently observed (Kiley et al, 1985, Bouverot and Hildwein, 1978). In contrast, V̇ o 2 has only been shown to decrease during hypoxia in the Japanese quail (studied at T a = 5°C; Weathers and Snyder, 1974) and, at least in one study, the rufous-collared sparrow (Castro et al, 1985; but see Novoa et al, 1991). Rather, many avian species do not change V̇ o 2 during hypoxia, including the bobwhite quail (Boggs and Kilgore, 1983), burrowing owl (Boggs and Kilgore, 1983; Kilgore et al, 2008) and several small passerines (Novoa et al, 1991) or actually increase V̇ o 2 during hypoxia, including the greylag goose (Scott et al, 2008), bar-headed goose (Black and Tenney, 1980; Scott et al, 2008), house sparrow (Tucker, 1968), and the rosy and house finches (Clemens, 1988).…”

Section: Introductionmentioning

confidence: 96%

Thermoregulatory and metabolic responses of Japanese quail to hypoxia

Atchley

Foster

Bavis

2008

Comparative Biochemistry and Physiology Part A: Molecular &

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Common responses to hypoxia include decreased body temperature (T b ) and decreased energy metabolism. In this study, the effects of hypoxia and hypercapnia on T b and metabolic oxygen consumption (VȮ 2 ) were investigated in Japanese quail (Coturnix japonica). When exposed to hypoxia (15, 13, 11 and 9% O 2 ), T b decreased only at 11% and 9% O 2 compared to normoxia; quail were better able to maintain T b during acute hypoxia after a one-week acclimation to 10% O 2 . VȮ 2 also decreased during hypoxia, but at 9% O 2 this was partially offset by increased anaerobic metabolism. T b and VȮ 2 responses to 9% O 2 were exaggerated at lower ambient temperature (T a ), reflecting a decreased lower critical temperature during hypoxia. Conversely, hypoxia had little effect on T b or VȮ 2 at higher T a (36°C). We conclude that Japanese quail respond to hypoxia in much the same way as mammals, by reducing both T b and VȮ 2 . No relationship was found between the magnitudes of decreases in T b and VȮ 2 during 9% O 2 , however. Since metabolism is the source of heat generation, this suggests that Japanese quail increase thermolysis to reduce T b . During hypercapnia (3, 6 and 9% CO 2 ), T b was reduced only at 9% CO 2 while VȮ 2 was unchanged.

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Comparative responses of sea level and montane rufous-collared sparrows, Zonotrichia capensis, to hypoxia and cold

Cited by 14 publications

References 10 publications

Transcriptomic variation and plasticity in rufous‐collared sparrows (Zonotrichia capensis) along an altitudinal gradient

Transcriptomic variation and plasticity in rufous‐collared sparrows (Zonotrichia capensis) along an altitudinal gradient

MIGRATION-SELECTION BALANCE AND LOCAL ADAPTATION OF MITOCHONDRIAL HAPLOTYPES IN RUFOUS-COLLARED SPARROWS (ZONOTRICHIA CAPENSIS) ALONG AN ELEVATIONAL GRADIENT

Thermoregulatory and metabolic responses of Japanese quail to hypoxia

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