Long bone cross-sectional properties reflect changes in locomotor behavior in developing chimpanzees
ABSTRACT Objectives Recent studies indicate that the locomotor behavior of wild chimpanzees changes during development. Before transitioning to quadrupedal knuckle‐walking in adulthood, young chimpanzees engage in a significant amount of upper limb loading suspensory behavior. We investigated whethe...
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Published in | American journal of physical anthropology Vol. 160; no. 1; pp. 16 - 29 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.05.2016
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | ABSTRACT
Objectives
Recent studies indicate that the locomotor behavior of wild chimpanzees changes during development. Before transitioning to quadrupedal knuckle‐walking in adulthood, young chimpanzees engage in a significant amount of upper limb loading suspensory behavior. We investigated whether these dramatic changes in locomotion influence the strength and shape of chimpanzee long bones.
Materials and Methods
We examined changes in chimpanzee arboreal locomotion over the course of development using behavioral data collected on wild chimpanzees. We measured the midshaft geometric properties of femora and humeri of wild‐caught individuals housed in museum collections using micro computed tomographic scans.
Results
Chimpanzees spent less time moving arboreally as they aged. Femoral/humeral strength ratios also increased with age, as predicted by the changing loading environment during development. Additional analyses revealed that femoral shape, but not humeral shape, varied across chimpanzee age classes. Adult femora were more elliptical compared with those of infants. This change in adult femora is consistent with the observation that adult chimpanzees spend most of their time moving terrestrially and consequently experience a less variable loading environment than do infants.
Discussion
Taken together, these findings contribute to our understanding of how ontogenetic changes in function affect form. As similar changes may have characterized the behavioral and skeletal ontogeny of extinct hominoids including hominins, these findings furnish a potential means to make inferences about the behavior of fossil taxa based on the structural properties of their bones. Am J Phys Anthropol 160:16–29, 2016. © 2016 Wiley Periodicals, Inc. |
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Bibliography: | istex:472C23C4E1DB5A56958E6EA3D1A89DB6CA660165 L.S.B. Leakey Foundation Anthropology Department, University of Michigan ArticleID:AJPA22930 University of Michigan International Institute ark:/67375/WNG-QC6X7C6K-F National Science Foundation - No. IOB-0516644; No. BCS-0850951 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0002-9483 1096-8644 |
DOI: | 10.1002/ajpa.22930 |