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Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
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Modularity patterns in mammalian domestication: Assessing developmental hypotheses for diversification.

Laura A B Wilson1,2, Ana Balcarcel3, Madeleine Geiger3

  • 1School of Biological, Earth and Environmental Sciences University of New South Wales Sydney Australia.

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|August 9, 2021
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Summary
This summary is machine-generated.

The neural crest hypothesis suggests tameness selection altered embryonic neural crest cells, causing domestication syndrome traits. This study found cranial modules based on tissue origin, but domestication did not alter integration magnitudes, contrary to predictions.

Keywords:
Evolvabilitymorphological disparityselectionshape variationskulltameness

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Morphometrics

Background:

  • The neural crest hypothesis links tameness selection to altered neural crest cells, causing domestication syndrome traits.
  • Support for this hypothesis and the domestication syndrome remains debated, particularly regarding morphological data.

Purpose of the Study:

  • To assess cranial morphological integration and modularity in wild and domestic mammals.
  • To test predictions regarding neural crest versus mesoderm contributions to cranial development under domestication.

Main Methods:

  • Utilized geometric morphometrics on cranial landmarks from six wild/domestic mammal pairs.
  • Analyzed patterns of morphological integration and modularity based on embryonic tissue origin (neural crest vs. mesoderm).

Main Results:

  • Cranial elements show modular structuring based on tissue origin (neural crest and mesoderm).
  • Neural crest-derived cranial elements exhibited lower integration magnitudes, suggesting evolutionary flexibility.
  • Contrary to predictions, domesticates showed similar integration magnitudes to wild progenitors, with disparity not linked to integration changes.

Conclusions:

  • Developmental evolution preserves a framework promoting flexibility under domestication selection.
  • Cranial modularity based on embryonic origin is supported, but integration magnitudes do not change significantly with domestication.