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Among- and within-individual correlations between basal and maximal metabolic rates in birds

Journal Article


Abstract


  • The aerobic capacity model proposes that endothermy is a by-product of selection favouring high maximal metabolic rates (MMR) and its mechanistic coupling with basal metabolic rate (BMR). Attempts to validate this model in birds are equivocal and restricted to phenotypic correlations (rP), thus failing to distinguish among- and within-individual correlations (rind and re). We examined 300 paired measurements of BMR and MMR from 60 house sparrows before and after two levels of experimental manipulation – testosterone implants and immune challenge. Overall, repeatability was significant in both BMR (R=0.25±0.06) and MMR (R=0.52±0.06). Only the testosterone treatment altered the rP between BMR and MMR, which resulted from contrasting effects on rind and re. While rind was high and significant (0.62±0.22) in sham-implanted birds, re was negative and marginally non-significant (−0.15±0.09) in testosterone-treated birds. Thus, the expected mechanistic link between BMR and MMR was apparent, but only in birds with low testosterone levels.

Publication Date


  • 2014

Citation


  • Careau, V., Hoye, B. J., O'Dwyer, T. W. & Buttemer, W. A. (2014). Among- and within-individual correlations between basal and maximal metabolic rates in birds. The Journal of Experimental Biology, 217 (20), 3593-3596.

Scopus Eid


  • 2-s2.0-84925865720

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/2360

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 3593

End Page


  • 3596

Volume


  • 217

Issue


  • 20

Place Of Publication


  • United Kingdom

Abstract


  • The aerobic capacity model proposes that endothermy is a by-product of selection favouring high maximal metabolic rates (MMR) and its mechanistic coupling with basal metabolic rate (BMR). Attempts to validate this model in birds are equivocal and restricted to phenotypic correlations (rP), thus failing to distinguish among- and within-individual correlations (rind and re). We examined 300 paired measurements of BMR and MMR from 60 house sparrows before and after two levels of experimental manipulation – testosterone implants and immune challenge. Overall, repeatability was significant in both BMR (R=0.25±0.06) and MMR (R=0.52±0.06). Only the testosterone treatment altered the rP between BMR and MMR, which resulted from contrasting effects on rind and re. While rind was high and significant (0.62±0.22) in sham-implanted birds, re was negative and marginally non-significant (−0.15±0.09) in testosterone-treated birds. Thus, the expected mechanistic link between BMR and MMR was apparent, but only in birds with low testosterone levels.

Publication Date


  • 2014

Citation


  • Careau, V., Hoye, B. J., O'Dwyer, T. W. & Buttemer, W. A. (2014). Among- and within-individual correlations between basal and maximal metabolic rates in birds. The Journal of Experimental Biology, 217 (20), 3593-3596.

Scopus Eid


  • 2-s2.0-84925865720

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/2360

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 3593

End Page


  • 3596

Volume


  • 217

Issue


  • 20

Place Of Publication


  • United Kingdom