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Ontogenetic patterns in heritable variation for body size: using random regression models in a wild ungulate population Open Access


Author or creator
Wilson, A.J.
Kruuk, L.E.B.
Coltman, D.W.
Additional contributors
Ovis canadensis
random regression
genetic correlation
maternal effect
Type of item
Journal Article (Published)
Body size is an important determinant of fitness in many organisms. While size will typically change over the lifetime of an individual, heritable components of phenotypic variance may also show ontogenetic variation. We estimated genetic (additive and maternal) and environmental covariance structures for a size trait (June weight) measured over the first 5 years of life in a natural population of bighorn sheep Ovis canadensis. We also assessed the utility of random regression models for estimating these structures. Additive genetic variance was found for June weight, with heritability increasing over ontogeny because of declining environmental variance. This pattern, mirrored at the phenotypic level, likely reflects viability selection acting on early size traits. Maternal genetic effects were significant at ages 0 and 1, having important evolutionary implications for early weight, but declined with age being negligible by age 2. Strong positive genetic correlations between age-specific traits suggest that selection on June weight at any age will likely induce positively correlated responses across ontogeny. Random regression modeling yielded similar results to traditional methods. However, by facilitating more efficient data use where phenotypic sampling is incomplete, random regression should allow better estimation of genetic (co)variances for size and growth traits in natural populations.
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Copyright 2005 by The University of Chicago.
Citation for previous publication
Wilson, A. J., Kruuk, L. E. B., & Coltman, D. W. (2005). Ontogenetic patterns in heritable variation for body size: using random regression models in a wild ungulate population. The American naturalist, 166(6), E177-E192.
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File title: Ontogenetic Patterns in Heritable Variation for Body Size: Using Random Regression Models in a Wild Ungulate Population.
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