Comparisons of Limb Structural Properties in Free-ranging Chimpanzees from Kibale, Gombe, Mahale, and Taï Communities

  • Kristian J. Carlson
  • Richard W. Wrangham
  • Martin N. Muller
  • D. Rick Sumner
  • M. E. Morbeck
  • Toshisada Nishida
  • Atsushi Yamanaka
  • Christophe Boesch

Abstract

Structural characteristics of limb bones provide insight into how an animal dynamically loads its limbs during life. Cause-and-effect relationships between loading and the osteogenic response it elicits are complex. In spite of such complexities, cross-sectional geometric properties can be useful indicators of locomotor repertoires. Typical comparisons use primates that are distinguished by broad habitual locomotor differences, usually with samples garnered from several museum collections. Intraspecific variability is difficult to investigate in such samples because knowledge of their behavior or life histories, which are tools for interpreting intraspecific variability, is limited. Clearly, intraspecific variation both in morphology and behavior/life history exists. Here we expand an ongoing effort toward understanding intraspecific variation in limb structural properties by comparing free-ranging chimpanzees that have associated behavioral and life history data. Humeral and femoral data from 11 adult chimpanzees (Pan troglodytes) of Kibale National Park (Uganda) are compared to 29 adult chimpanzees from Gombe (Tanzania), Mahale Mountains (Tanzania), and Taï Forest (Côte d’Ivoire) National Park communities. Overall, limb structural morphology of Kibale chimpanzees most resembles limb structural morphology of Mahale chimpanzees. Shape ratios and percentage cortical areas of Kibale chimpanzees are most similar to non-Gombe chimpanzees, while Kibale structural properties, e.g., maximum rigidity, are most similar to non-Taï structural properties. Even after adding Kibale females, Taï females continue to stand out from females in other communities.

Keywords

Cross-sectional geometry Functional morphology Locomotor ­behavior Pan troglodytes 

Abbreviations

ANOVA

analysis of variance

AP

anteroposterior

BM

body mass

%CA

percentage cortical area of cross sections

CA

cortical area

F

femur

FMSID

supero-inferior diameter of the femoral head

G

Gombe

H

humerus

HHMD

maximum diameter of the humeral head

Imax/Imin

maximum/minimum rigidity (principal moments of area) Ix/Iy second moments of area about anatomical planes

K

Kibale

KS

Kolmogorov-Smirnov

L

bone length

LSD

least significant difference

M

Mahale

ML

mediolateral

ROI

region of interest

sImax

normalized Imax (maximal rigidity)

SD

standard deviation

T

Taï

TA

total cross-sectional area

VOI

volume of interest

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Kristian J. Carlson
    • 1
  • Richard W. Wrangham
  • Martin N. Muller
  • D. Rick Sumner
  • M. E. Morbeck
  • Toshisada Nishida
  • Atsushi Yamanaka
  • Christophe Boesch
  1. 1.Institute for Human EvolutionUniversity of the WitwatersrandJohannesburgSouth Africa

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