Ontogeny of hallucal metatarsal rigidity and shape in the rhesus monkey (Macaca mulatta) and chimpanzee (Pan troglodytes)

Biren A. Patel, Jason Organ, Tea Jashashvili, Stephanie H. Bui, Holly M. Dunsworth

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Life history variables including the timing of locomotor independence, along with changes in preferred locomotor behaviors and substrate use during development, influence how primates use their feet throughout ontogeny. Changes in foot function during development, in particular the nature of how the hallux is used in grasping, can lead to different structural changes in foot bones. To test this hypothesis, metatarsal midshaft rigidity [estimated from the polar second moment of area (J) scaled to bone length] and cross-sectional shape (calculated from the ratio of maximum and minimum second moments of area, Imax/Imin) were examined in a cross-sectional ontogenetic sample of rhesus macaques (Macaca mulatta; n = 73) and common chimpanzees (Pan troglodytes; n = 79). Results show the hallucal metatarsal (Mt1) is relatively more rigid (with higher scaled J-values) in younger chimpanzees and macaques, with significant decreases in relative rigidity in both taxa until the age of achieving locomotor independence. Within each age group, Mt1 rigidity is always significantly higher in chimpanzees than macaques. When compared with the lateral metatarsals (Mt2–5), the Mt1 is relatively more rigid in both taxa and across all ages; however, this difference is significantly greater in chimpanzees. Length and J scale with negative allometry in all metatarsals and in both species (except the Mt2 of chimpanzees, which scales with positive allometry). Only in macaques does Mt1 midshaft shape significantly change across ontogeny, with older individuals having more elliptical cross-sections. Different patterns of development in metatarsal diaphyseal rigidity and shape likely reflect the different ways in which the foot, and in particular the hallux, functions across ontogeny in apes and monkeys.

Original languageEnglish (US)
Pages (from-to)39-53
Number of pages15
JournalJournal of Anatomy
Volume232
Issue number1
DOIs
StatePublished - Jan 1 2018

Fingerprint

Metatarsal Bones
Pan troglodytes
rigidity
Macaca mulatta
ontogeny
allometry
Macaca
Hallux
Foot
bone
Foot Bones
bones
structural change
primate
life history
cross section
Hominidae
Pongidae
substrate
Primates

Keywords

  • ape
  • climbing
  • cross-sectional geometry
  • grasping
  • hallux
  • monkey

ASJC Scopus subject areas

  • Anatomy
  • Histology
  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Cite this

Ontogeny of hallucal metatarsal rigidity and shape in the rhesus monkey (Macaca mulatta) and chimpanzee (Pan troglodytes). / Patel, Biren A.; Organ, Jason; Jashashvili, Tea; Bui, Stephanie H.; Dunsworth, Holly M.

In: Journal of Anatomy, Vol. 232, No. 1, 01.01.2018, p. 39-53.

Research output: Contribution to journalArticle

Patel, Biren A. ; Organ, Jason ; Jashashvili, Tea ; Bui, Stephanie H. ; Dunsworth, Holly M. / Ontogeny of hallucal metatarsal rigidity and shape in the rhesus monkey (Macaca mulatta) and chimpanzee (Pan troglodytes). In: Journal of Anatomy. 2018 ; Vol. 232, No. 1. pp. 39-53.
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