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1 August 2005 QUANTITATIVE GENETICS OF BIOENERGETICS AND GROWTH-RELATED TRAITS IN THE WILD MAMMAL, PHYLLOTIS DARWINI
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Abstract

We studied the potential for response to selection in typical physiological-thermoregulatory traits of mammals such as maximum metabolic rate (MMR), nonshivering thermogenesis (NST) and basal metabolic rate (BMR) on cold-acclimated animals. We used an animal model approach to estimate both narrow-sense heritabilities (h2) and genetic correlations between physiological and growth-related traits. Univariate analyses showed that MMR presented high, significant heritability (h2 = 0.69 ± 0.35, asymptotic standard error), suggesting the potential for microevolution in this variable. However, NST and BMR presented low, nonsignificant h2, and NST showed large maternal/common environmental/nonadditive effects (c2 = 0.34 ± 0.17). Heritabilities were large and significant (h2 > 0.5) for all growth-related traits (birth mass, growth rate, weaning mass). The only significant genetic correlations we found between a physiological trait and a growth-related trait was between NST and birth mass (r = −0.74; P < 0.05). Overall, these results suggest that additive genetic variance is present in several bioenergetic traits, and that genetic correlations could be present between those different kinds of traits.

Roberto F. Nespolo, Diego M. Bustamante, Leonardo D. Bacigalupe, and Francisco Bozinovic "QUANTITATIVE GENETICS OF BIOENERGETICS AND GROWTH-RELATED TRAITS IN THE WILD MAMMAL, PHYLLOTIS DARWINI," Evolution 59(8), 1829-1837, (1 August 2005). https://doi.org/10.1554/04-408.1
Received: 30 June 2004; Accepted: 6 June 2005; Published: 1 August 2005
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