Eco-geographic and sexual variation of the ribcage in Homo sapiens

IF 4.6 2区社会学 Q1 ANTHROPOLOGY

Evolutionary Anthropology Pub Date : 2024-07-01 DOI:10.1002/evan.22040

José M. López-Rey, Manuel D. D'Angelo del Campo, Verónica Seldes, Daniel García-Martínez, Markus Bastir

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Abstract

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.

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智人肋骨的生态地理和性别变异。

迄今为止，Allen 和 Bergmann 的规则是通过分析肢体长度、身高或体重的差异来研究现代人的。然而，目前还没有研究纬度对肋骨三维结构影响的出版物。为了评估这个问题，我们对全球分布的 109 个成年个体的肋骨进行了数字重建。我们使用几何形态计量学对肋骨的形状和大小进行了量化。我们的结果表明，热带个体的肋骨与生活在高纬度地区的其他个体相比更小、更细，这与艾伦和伯格曼的规则一致，并表明大小与形状之间存在着异速关系。虽然在整个样本中都观察到了性二型现象，但只有在热带种群中才发现了显著差异。我们的建议是，除了潜在的性选择外，避免热量损失可能是适应寒冷的种群出现性二型的限制因素。

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来源期刊

Evolutionary Anthropology ANTHROPOLOGY-

CiteScore

7.00

自引率

5.40%

发文量

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.