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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
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Published on: October 1, 2011

Allometric disparity in rodent evolution.

Laura A B Wilson1

  • 1Kyoto University Museum, Kyoto University Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan.

Ecology and Evolution
|April 24, 2013
PubMed
Summary
This summary is machine-generated.

Rodent cranial growth trajectories differ between Sciuridae and other clades. Conservatism in Sciuridae

Keywords:
Allometric trajectoryRodentiacraniumdietmorphological evolutionphenotypic covariance structure

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Morphometrics

Background:

  • Allometric trajectories describe how traits change during growth.
  • Rodents exhibit diverse cranial forms, but the evolution of these forms is not fully understood.
  • Understanding cranial allometry is key to deciphering rodent evolutionary diversification.

Purpose of the Study:

  • To compare allometric trajectories of cranial growth across major rodent clades.
  • To quantify disparity in cranial growth and adult morphology.
  • To investigate the influence of ecological factors, like diet, on allometric evolution.

Main Methods:

  • Analysis of allometric trajectories in multivariate morphospace for 51 rodent species.
  • Comparison of trajectory variability with adult disparity and dietary habits.
  • Examination of major rodent clades: Ctenohystrica, Muroidea, and Sciuridae.

Main Results:

  • Sciuridae showed reduced inter-trajectory change and less variation in allometric coefficients compared to Ctenohystrica and Muroidea.
  • Ctenohystrica and Muroidea exhibited greater differences between trajectories and higher allometric coefficient variation.
  • Higher adult disparity was observed in Ctenohystrica and Muroidea than in Sciuridae.

Conclusions:

  • Rodent cranial allometric evolution differs significantly between Sciuridae and other major clades.
  • Conservatism in allometric trajectory modification may limit morphological diversity in rodents.
  • Ecological factors, specifically dietary habits, play a role in shaping rodent allometric trajectories.