Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy.
The underlying assumption of the aerobic capacity model for the evolution of endothermy is that basal (BMR) and maximal aerobic metabolic rates are phenotypically linked. However, because BMR is largely a function of central organs whereas maximal metabolic output is largely a function of skeletal m...
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ftdoajarticles:oai:doaj.org/article:2408078c893544b5b75d0303d5426877 2023-05-15T15:34:43+02:00 Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. David L Swanson Nathan E Thomas Eric T Liknes Sheldon J Cooper 2012-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0034271 https://doaj.org/article/2408078c893544b5b75d0303d5426877 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3313994?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0034271 https://doaj.org/article/2408078c893544b5b75d0303d5426877 PLoS ONE, Vol 7, Iss 3, p e34271 (2012) Medicine R Science Q article 2012 ftdoajarticles https://doi.org/10.1371/journal.pone.0034271 2022-12-30T22:14:28Z The underlying assumption of the aerobic capacity model for the evolution of endothermy is that basal (BMR) and maximal aerobic metabolic rates are phenotypically linked. However, because BMR is largely a function of central organs whereas maximal metabolic output is largely a function of skeletal muscles, the mechanistic underpinnings for their linkage are not obvious. Interspecific studies in birds generally support a phenotypic correlation between BMR and maximal metabolic output. If the aerobic capacity model is valid, these phenotypic correlations should also extend to intraspecific comparisons. We measured BMR, M(sum) (maximum thermoregulatory metabolic rate) and MMR (maximum exercise metabolic rate in a hop-flutter chamber) in winter for dark-eyed juncos (Junco hyemalis), American goldfinches (Carduelis tristis; M(sum) and MMR only), and black-capped chickadees (Poecile atricapillus; BMR and M(sum) only) and examined correlations among these variables. We also measured BMR and M(sum) in individual house sparrows (Passer domesticus) in both summer, winter and spring. For both raw metabolic rates and residuals from allometric regressions, BMR was not significantly correlated with either M(sum) or MMR in juncos. Moreover, no significant correlation between M(sum) and MMR or their mass-independent residuals occurred for juncos or goldfinches. Raw BMR and M(sum) were significantly positively correlated for black-capped chickadees and house sparrows, but mass-independent residuals of BMR and M(sum) were not. These data suggest that central organ and exercise organ metabolic levels are not inextricably linked and that muscular capacities for exercise and shivering do not necessarily vary in tandem in individual birds. Why intraspecific and interspecific avian studies show differing results and the significance of these differences to the aerobic capacity model are unknown, and resolution of these questions will require additional studies of potential mechanistic links between minimal and maximal metabolic output. Article in Journal/Newspaper Avian Studies Directory of Open Access Journals: DOAJ Articles PLoS ONE 7 3 e34271 |
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English |
topic |
Medicine R Science Q |
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Medicine R Science Q David L Swanson Nathan E Thomas Eric T Liknes Sheldon J Cooper Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
topic_facet |
Medicine R Science Q |
description |
The underlying assumption of the aerobic capacity model for the evolution of endothermy is that basal (BMR) and maximal aerobic metabolic rates are phenotypically linked. However, because BMR is largely a function of central organs whereas maximal metabolic output is largely a function of skeletal muscles, the mechanistic underpinnings for their linkage are not obvious. Interspecific studies in birds generally support a phenotypic correlation between BMR and maximal metabolic output. If the aerobic capacity model is valid, these phenotypic correlations should also extend to intraspecific comparisons. We measured BMR, M(sum) (maximum thermoregulatory metabolic rate) and MMR (maximum exercise metabolic rate in a hop-flutter chamber) in winter for dark-eyed juncos (Junco hyemalis), American goldfinches (Carduelis tristis; M(sum) and MMR only), and black-capped chickadees (Poecile atricapillus; BMR and M(sum) only) and examined correlations among these variables. We also measured BMR and M(sum) in individual house sparrows (Passer domesticus) in both summer, winter and spring. For both raw metabolic rates and residuals from allometric regressions, BMR was not significantly correlated with either M(sum) or MMR in juncos. Moreover, no significant correlation between M(sum) and MMR or their mass-independent residuals occurred for juncos or goldfinches. Raw BMR and M(sum) were significantly positively correlated for black-capped chickadees and house sparrows, but mass-independent residuals of BMR and M(sum) were not. These data suggest that central organ and exercise organ metabolic levels are not inextricably linked and that muscular capacities for exercise and shivering do not necessarily vary in tandem in individual birds. Why intraspecific and interspecific avian studies show differing results and the significance of these differences to the aerobic capacity model are unknown, and resolution of these questions will require additional studies of potential mechanistic links between minimal and maximal metabolic output. |
format |
Article in Journal/Newspaper |
author |
David L Swanson Nathan E Thomas Eric T Liknes Sheldon J Cooper |
author_facet |
David L Swanson Nathan E Thomas Eric T Liknes Sheldon J Cooper |
author_sort |
David L Swanson |
title |
Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
title_short |
Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
title_full |
Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
title_fullStr |
Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
title_full_unstemmed |
Intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
title_sort |
intraspecific correlations of basal and maximal metabolic rates in birds and the aerobic capacity model for the evolution of endothermy. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2012 |
url |
https://doi.org/10.1371/journal.pone.0034271 https://doaj.org/article/2408078c893544b5b75d0303d5426877 |
genre |
Avian Studies |
genre_facet |
Avian Studies |
op_source |
PLoS ONE, Vol 7, Iss 3, p e34271 (2012) |
op_relation |
http://europepmc.org/articles/PMC3313994?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0034271 https://doaj.org/article/2408078c893544b5b75d0303d5426877 |
op_doi |
https://doi.org/10.1371/journal.pone.0034271 |
container_title |
PLoS ONE |
container_volume |
7 |
container_issue |
3 |
container_start_page |
e34271 |
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