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A new, three-dimensional geometric morphometric approach to assess egg shape.

Marie R G Attard1,2, Emma Sherratt1,3, Paul McDonald1

  • 1Zoology Department, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia.

Peerj
|July 4, 2018
PubMed
Summary

This study introduces a new 3D geometric morphometrics method for precise egg shape analysis, revealing significant within-species variation across clutches that requires consideration in future research.

Keywords:
Bird eggClutchCurvatureEgg shapeGeometric morphometricsMorphospacePasserineThree-dimensional

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Biophysics

Background:

  • Established methods for egg shape analysis often rely on 2D projections or linear measurements, which can introduce errors and overlook surface curvature.
  • Previous comparative studies on avian egg shape variation have often neglected the substantial impact of within-species variation, potentially biasing results.

Purpose of the Study:

  • To develop and validate a novel 3D geometric morphometrics methodology for accurately quantifying egg shape variation.
  • To assess egg shape disparity at multiple biological levels: within clutches, between clutches, and among species.
  • To highlight the importance of accounting for within-species variation in evolutionary and ecological studies of egg shape.

Main Methods:

  • Utilized geometric morphometrics on 3D landmarks from digitally reconstructed eggshells obtained via micro-computed tomography.
  • Applied the new methodology to quantify egg shape variation in four passerine species across different clutches and lineages.
  • Integrated the 3D shape data into workflows compatible with analyses such as finite element analysis.

Main Results:

  • The 3D methodology provides a more precise representation of eggshell curvature and avoids projection errors inherent in 2D methods.
  • Significant egg shape variation was observed both between and within clutches across the studied passerine species.
  • Species-level differences in egg shape exist, but are accompanied by extensive overlap due to substantial within-species variation.

Conclusions:

  • The proposed 3D geometric morphometrics approach offers a robust and versatile tool for analyzing egg shape variation across diverse taxa, including non-avian dinosaurs and reptiles.
  • Acknowledging and quantifying within-clutch and between-clutch variation is crucial for accurate interpretations of egg shape evolution and adaptation.
  • This freely accessible methodology can enhance future research in evolutionary biology, paleontology, and animal breeding by providing a more comprehensive understanding of egg morphology.