Evolutionary implications of the unusual walking mechanics of the common marmoset ( C. jacchus )

Bibliographic Data

ID8313647
AuthorsDaniel Schmitt (0000-0003-4314-5819, Duke University, corresponding author)
Year2003
Volume122
Issue1
Pages28-37
Publication date2003-09-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueAmerican Journal of Physical Anthropology (JOURNAL)
Journal identifiersISSN: 0002-9483 • E-ISSN: 1096-8644
PublisherWiley (PUBLISHER • GB)
DOI10.1002/ajpa.10214
PMID12923902
OpenAlexW2023778817
LanguageEN
Citations received44
References cited51

Several features that appear to differentiate the walking gaits of most primates from those of most other mammals (the prevalence of diagonal‐sequence footfalls, high degrees of humeral protraction, and low forelimb vs. hindlimb peak vertical forces) are believed to have evolved in response to requirements of locomotion on thin arboreal supports by early primates that had developed clawless grasping hands and feet. This putative relationship between anatomy, behavior, and ecology is tested here by examining gait mechanics in the common marmoset ( Callithrix jacchus ), a primate that has sharp claws and reduced pedal grasping, and that spends much of its time clinging on large trunks. Kinematic and kinetic data were collected on three male Callithrix jacchus as they walked across a force platform attached to the ground or to raised horizontal poles. The vast majority of all walking gaits were lateral‐sequence. For all steps, the humerus was retracted ( C. jacchus separate it from any other primate studied (including other callitrichids). The walking gaits of C. jacchus are mechanically more similar to those of small, nonprimate mammals. The results of this study support previous models that suggest that the unusual suite of features that typify the walking gaits of most primates are adaptations to the requirements of locomotion on thin arboreal supports. These data, along with data from other primates and marsupials, suggest that primate postcranial and locomotor characteristics are part of a basal adaptation for walking on thin branches. Am J Phys Anthropol 120:000–000, 2003. © 2003 Wiley‐Liss, Inc

Biology · Evolutionary biology · Marmoset · Amphibian and Reptile Biology · Animal Vocal Communication and Behavior · Paleontology · Primate Behavior and Ecology