Abstract
I address the question of how fluctuating asymmetry (FA)—the distribution of random deviations from bilateral symmetry—varies ontogenetically in the mammalian skeleton. This question is significant because of the light that such patterns can shed on the causes of variation in developmental stability in bone as well as other structures. Based on large ontogenetic skeletal series of Macaca mulatta and Homo sapiens, I report that the FA variances of skeletal metric traits increase ontogenetically. Coupled with the finding that FA variances also accumulate to greater magnitudes in slower growing mammals, this result is consistent with the hypotheses that FA in bone is primarily caused by (a) cumulative effects of asymmetrical mechanical factors, (b) accumulation of variation in the (local) regulation of growth, or (c) a tendency for bone morphology to drift through undirected remodeling. I discuss the implications of these optional explanations for primate evolution and bone development.
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Hallgrímsson, B. Ontogenetic Patterning of Skeletal Fluctuating Asymmetry in Rhesus Macaques and Humans: Evolutionary and Developmental Implications. International Journal of Primatology 20, 121–151 (1999). https://doi.org/10.1023/A:1020540418554
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DOI: https://doi.org/10.1023/A:1020540418554