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Phylogenetic analysis of mammalian maximal oxygen consumption during exercise

  • Author(s): Dlugosz, EM
  • Chappell, MA
  • Meek, TH
  • Szafrańska, PA
  • Zub, K
  • Konarzewski, M
  • Jones, JH
  • Bicudo, JEPW
  • Nespolo, RF
  • Careau, V
  • Garland, T
  • et al.
Abstract

We compiled published values of mammalian maximum oxygen consumption during exercise (VO2,max) and supplemented these data with new measurements of VO2,maxfor the largest rodent (capybara), 20 species of smaller-bodied rodents, two species of weasels and one small marsupial. Many of the new data were obtained with running-wheel respirometers instead of the treadmill systems used in most previous measurements of mammalian VO2,max. We used both conventional and phylogenetically informed allometric regression models to analyze VO2,maxof 77 species' (including subspecies or separate populations within species) in relation to body size, phylogeny, diet and measurement method. Both body mass and allometrically mass-corrected VO2,maxshowed highly significant phylogenetic signals (i.e. related species tended to resemble each other). The Akaike information criterion corrected for sample size was used to compare 27 candidate models predicting VO2,max(all of which included body mass). In addition to mass, the two best-fitting models (cumulative Akaike weight=0.93) included dummy variables coding for three species previously shown to have high VO2,max(pronghorn, horse and a bat), and incorporated a transformation of the phylogenetic branch lengths under an OrnsteinUhlenbeck model of residual variation (thus indicating phylogenetic signal in the residuals). We found no statistical difference between wheel-and treadmill-elicited values, and diet had no predictive ability for VO2,max. Averaged across all models, the allometric scaling exponent was 0.839, with 95% confidence limits of 0.795 and 0.883, which does not provide support for a scaling exponent of 0.67, 0.75 or unity. © 2013. Published by The Company of Biologists Ltd.

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