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Creating Avian Forebrain Chimeras to Assess Facial Development
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Beak morphometry and morphogenesis across avian radiations.

Salem Mosleh1, Gary P T Choi2, Grace M Musser3,4

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Proceedings. Biological Sciences
|September 27, 2023
PubMed
Summary
This summary is machine-generated.

Adaptive beak diversification in birds like Darwin's finches is explained by a simple growth law. This developmental constraint links beak shape evolution to observed natural forms, impacting diet adaptation.

Keywords:
Darwin’s finchesEvoDevoHawaiian honeycreepersevolutionmorphogenesismorphometry

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Area of Science:

  • Evolutionary biology
  • Geometric morphometrics
  • Developmental biology

Background:

  • Adaptive radiation drives beak diversification in birds, exemplified by Darwin's finches and Hawaiian honeycreepers.
  • Understanding the geometric and developmental basis of beak shape is crucial for explaining functional diversity.

Purpose of the Study:

  • To quantify beak and skull shape using geometric measures.
  • To identify key parameters correlating beak shape with diet.
  • To investigate the developmental mechanisms underlying beak shape evolution.

Main Methods:

  • Geometric morphometrics applied to beak and skull shape quantification.
  • Analysis of beak shape variability using minimal geometric parameters.
  • Modeling beak shape using a geometry-driven growth law (modified mean curvature flow).

Main Results:

  • Two beak shape measures (width-to-length ratio and normalized sharpening rate) strongly correlate with diet.
  • Modified mean curvature flow accurately captures beak shapes in Darwin's finches and Hawaiian honeycreepers.
  • Developmental constraints, dictated by the growth law, limit observed beak morphologies.

Conclusions:

  • A simple growth law explains the evolution of diverse beak shapes in adaptive radiations.
  • Developmental processes impose constraints that shape evolutionary trajectories.
  • This study links evolutionary morphology and developmental biology through growth-driven constraints.