Increased performance in juvenile baboons is consistent with ontogenetic changes in morphology.

Title

Increased performance in juvenile baboons is consistent with ontogenetic changes in morphology.

Creator

Boulinguez-Ambroise Grégoire;Herrel A;Berillon G;Young JW;Cornette R;Meguerditchian A;Cazeau C;Bellaiche L;Pouydebat E

Publisher

American Journal Of Physical Anthropology

Date

2021
2021-01-23

Description

OBJECTIVES: In many primates, the greater proportion of climbing and suspensory behaviors in the juvenile repertoire likely necessitates good grasping capacities. Here, we tested whether very young individuals show near-maximal levels of grasping strength, and whether such an early onset of grasping performance could be explained by ontogenetic variability in the morphology of the limbs in baboons. MATERIAL AND METHODS: We quantified a performance trait, hand pull strength, at the juvenile and adult stages in a cross-sectional sample of 15 olive baboons (Papio anubis). We also quantified bone dimensions (i.e., lengths, widths, and heights) of the fore- (n = 25) and hind limb (n = 21) elements based on osteological collections covering the whole development of olive baboons. RESULTS: One-year old individuals demonstrated very high pull strengths (i.e., 200% of the adult performance, relative to body mass), that are consistent with relatively wider phalanges and digit joints in juveniles. The mature proportions and shape of the forelimb elements appeared only at full adulthood (i.e., ≥4.5 years), whereas the mature hind limb proportions and shape were observed much earlier during development. DISCUSSION: These changes in limb performance and morphology across ontogeny may be explained with regard to behavioral transitions that olive baboons experience during their development. Our findings highlight the effect of infant clinging to mother, an often-neglected feature when discussing the origins of grasping in primates. The differences in growth patterns, we found between the forelimb and the hind limb further illustrate their different functional roles, having likely evolved under different ecological pressures (manipulation and locomotion, respectively).

Subject

allometry; development; grasping performance; limb morphology; primate evolution

Identifier

Format

journalArticle

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Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

ISSN

1096-8644 0002-9483

NEOMED College

NEOMED College of Medicine

NEOMED Department

Department of Anatomy & Neurobiology

Update Year & Number

February 2021 List

Citation

Boulinguez-Ambroise Grégoire;Herrel A;Berillon G;Young JW;Cornette R;Meguerditchian A;Cazeau C;Bellaiche L;Pouydebat E, “Increased performance in juvenile baboons is consistent with ontogenetic changes in morphology.,” NEOMED Bibliography Database, accessed April 13, 2021, https://neomed.omeka.net/items/show/11559.

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