José M. López-Rey, Manuel D. D'Angelo del Campo, Verónica Seldes, Daniel García-Martínez, Markus Bastir
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Eco-geographic and sexual variation of the ribcage in Homo sapiens
Up to now, Allen and Bergmann's rules have been studied in modern humans by analyzing differences in limb length, height, or body mass. However, there are no publications studying the effects of latitude in the 3D configuration of the ribcage. To assess this issue, we digitally reconstructed the ribcages of a balanced sample of 109 adult individuals of global distribution. Shape and size of the ribcage was quantified using geometric morphometrics. Our results show that the ribcage belonging to tropical individuals is smaller and slenderer compared to others living in higher latitudes, which is in line with Allen and Bergmann's rules and suggests an allometric relationship between size and shape. Although sexual dimorphism was observed in the whole sample, significant differences were only found in tropical populations. Our proposal is that, apart from potential sexual selection, avoiding heat loss might be the limiting factor for sexual dimorphism in cold-adapted populations.
期刊介绍：
Evolutionary Anthropology is an authoritative review journal that focuses on issues of current interest in biological anthropology, paleoanthropology, archaeology, functional morphology, social biology, and bone biology — including dentition and osteology — as well as human biology, genetics, and ecology. In addition to lively, well-illustrated articles reviewing contemporary research efforts, this journal also publishes general news of relevant developments in the scientific, social, or political arenas. Reviews of noteworthy new books are also included, as are letters to the editor and listings of various conferences. The journal provides a valuable source of current information for classroom teaching and research activities in evolutionary anthropology.
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