Trabecular structure of the elbow reveals divergence in knuckle-walking biomechanical strategies of African apes
Arias-Martorell, Julia (Institut Català de Paleontologia Miquel Crusafont)
Zeininger, Angel (Duke University. Department of Evolutionary Anthropology)
Kivell, Tracy L. (Max Planck Institute for Evolutionary Anthropology. Department of Human Evolution)

Fecha:	2021
Resumen:	African apes engage in a distinct form of locomotion called knuckle-walking, but there is much ambiguity as to when and how this locomotor behaviour evolved. This study aims to elucidate potential differences in knuckle-walking elbow posture and loading in African apes through the study of trabecular bone. Using a whole-epiphysis approach, we quantified variation in trabecular structure of the distal humerus of chimpanzees, western lowland gorillas, and mountain gorillas in comparison to orang-utans, siamangs and a sample of Old and New World monkeys. Results demonstrate differences in the distribution of trabecular bone within the distal humerus that are consistent across taxa that habitually use a flexed-elbow posture in comparison to those that use an extended-elbow during locomotion. Western lowland gorillas show an extended-elbow pattern consistent with the straight forelimb position during knuckle-walking, whereas chimpanzees show a flexed-elbow pattern. Unexpectedly, mountain gorillas show an intermediate pattern between their western counterparts and chimpanzees. The differences found in elbow joint posture between chimpanzees and gorillas, and between gorilla species, point to diversification in the knuckle-walking biomechanical strategies among African apes, which has implications in the debate regarding the locomotor behaviour from which human bipedalism arose.
Ayudas:	European Commission 703608 European Commission 336301 Agència de Gestió d'Ajuts Universitaris i de Recerca BP0058 European Commission 801370
Derechos:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Bone functional adaptation ; Joint posture ; Hominoid ; Locomotion ; Chimpanzee ; Gorilla
Publicado en:	Evolution, Vol. 75, Issue 11 (November 2021) , p. 2959-2971, ISSN 1558-5646

DOI: 10.1111/evo.14354

Postprint 36 p, 1.7 MB

Supplementary material 17 p, 12.6 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Paleontologia Miquel Crusafont (ICP)
Artículos > Artículos de investigación
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