Metacarpal Trabecular Architecture Variation in the Chimpanzee (Pan troglodytes): Evidence for Locomotion and Tool-Use?
Metacarpal Trabecular Architecture Variation in the Chimpanzee (Pan troglodytes): Evidence for Locomotion and Tool-Use?
复制标题
DOI：
10.1002/ajpa.21390
复制
发表时间：
2011-02-01
影响因子：
2.8
通讯作者：
Boesch, Christophe
中科院分区：
文献类型：
--
作者：
Lazenby, Richard A.;Skinner, Matthew M.;Boesch, Christophe
通过3D微计算机断层扫描对19只成年普通黑猩猩掌骨（MC）1、2和5的头部和基部内的球形感兴趣体积进行骨小梁结构评估。两个亚种，西非Pan troglodytes verus从Tai森林，科特迪瓦（n = 12）和中非P t。troglodytes从喀麦隆（n = 7）进行了研究。对于组合样本，掌骨头的特点是所有掌骨的骨体积分数更大，尽管MC 1的特点是具有更厚、更板状的骨小梁。MC 2和MC 5的结构可能与陆地关节行走相关的应变有关。特别地，相对鲁棒的MC 5头部架构可能是由于在制动和使用手掌在手姿势期间引起的功能负荷。通过检查样本之间的差异，我们发现喀麦隆黑猩猩的所有掌骨都具有更强大的结构，其形式为更大的骨体积分数，更高的连通性和更大的板状结构。这些差异是无法解释的人口差异的身体大小或日常旅行距离，但可能反映了更多的陆地指关节行走在喀麦隆样本和更多样化的手姿势和精度处理所需的坚果开裂在西非黑猩猩的组合。美国物理人类学杂志144：215-225，2011。(C)2010 Wiley-Liss，Inc.
Trabecular architecture was assessed by 3D micro-computed tomography from spherical volumes of interest located within the head and base of metacarpals (MC) 1, 2, and 5 from n = 19 adult common chimpanzees. Two subspecies, West African Pan troglodytes verus from the Tai Forest, Cote d'Ivoire (n = 12) and Central African P t. troglodytes from Cameroon (n = 7), were studied. For the combined sample, the metacarpal head is distinguished by greater bone volume fraction across all metacarpals, though the MC 1 is distinctive in having thicker, more plate-like trabeculae. The architecture in the MC 2 and MC 5 can be related to strains associated with terrestrial knuckle-walking. In particular, the relatively robust MC 5 head architecture may result from functional loading incurred during braking and use of a palm-in hand posture. Examining differences between samples, we found that the Cameroon chimpanzees possess a more robust architecture across all metacarpals in the form of greater bone volume fraction, higher connectivity, and somewhat more plate-like structure. These differences are not explicable in terms of population distinctions in body size or daily travel distance, but possibly reflect a combination of more terrestrial knuckle-walking in the Cameroon sample and more diverse hand postures and precision handling required of nut-cracking in West African chimpanzees. Am J Phys Anthropol 144:215-225, 2011. (C) 2010 Wiley-Liss, Inc.