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Related Experiment Video

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Dissection, MicroCT Scanning and Morphometric Analyses of the Baculum

Dissection, MicroCT Scanning and Morphometric Analyses of the Baculum

Published on: March 19, 2017

Evolutionary covariation in geometric morphometric data: analyzing integration, modularity, and allometry in a

Christian Peter Klingenberg¹, Jesús Marugán-Lobón

¹Faculty of Life Sciences, University of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK. cpk@manchester.ac.uk

Systematic Biology

|April 17, 2013

Summary

Evolutionary changes in bird skull shape show strong integration between the face and braincase, rejecting modularity. Geometric morphometrics applied to phylogenetically independent contrasts reveal evolutionary allometry.

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Area of Science:

Evolutionary biology
Comparative anatomy
Geometric morphometrics

Background:

Understanding evolutionary patterns requires quantifying trait integration and modularity.
Comparative studies must account for phylogenetic structure in interspecific data.

Purpose of the Study:

To apply geometric morphometrics tools to comparative data for analyzing evolutionary integration and modularity.
To investigate cranial evolution in birds using phylogenetically informed methods.

Main Methods:

Application of geometric morphometrics tools (PCA, multivariate regression, PLS, modularity tests) to phylogenetically independent contrasts of shape data.
Analysis of cranial evolution in 160 bird species across all orders.
Multivariate regression of shape contrasts on size contrasts to assess evolutionary allometry.

Main Results:

Significant phylogenetic signal detected in bird skull shape.
Clear evidence of evolutionary allometry between skull shape and size.
Strong evolutionary integration between the avian face and braincase, refuting modularity.

Conclusions:

Geometric morphometrics can be effectively applied to comparative datasets to study evolutionary integration and modularity.
The avian face and braincase function as integrated units during evolution, not as separate modules.
This approach is adaptable to other taxa and morphometric questions.