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A Practical Guide to Phylogenetics for Nonexperts
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Published on: February 5, 2014

Testing and quantifying phylogenetic signals and homoplasy in morphometric data.

Christian Peter Klingenberg1, Nelly A Gidaszewski

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

Systematic Biology
|June 8, 2010
PubMed
Summary

This study introduces a novel method for analyzing morphometric data within phylogenetics, revealing a significant phylogenetic signal in Drosophila wing shape. However, morphometric data alone may not reliably infer evolutionary relationships.

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Morphometrics

Background:

  • The integration of morphometric data into phylogenetic analysis has been historically contentious.
  • Previous studies faced challenges in accurately incorporating shape data into evolutionary trees.

Purpose of the Study:

  • To propose a new approach for mapping morphometric traits onto existing phylogenies.
  • To develop statistical tests for assessing phylogenetic signal in morphometric data.
  • To evaluate the reliability of morphometric data for inferring evolutionary history.

Main Methods:

  • Treating shape as a multidimensional character.
  • Permutation tests to simulate the null hypothesis of no phylogenetic structure.
  • Developing consistency and retention indices for morphometric data.
  • Applying methods to Drosophila melanogaster subgroup wing shape evolution.

Main Results:

  • A significant phylogenetic signal was detected in the wing shape of the Drosophila melanogaster subgroup.
  • A low degree of homoplasy was observed in the morphometric data.
  • The phylogenetic tree derived from wing shape data was inconsistent with a well-supported molecular phylogeny.

Conclusions:

  • The proposed methods can identify phylogenetic signals in morphometric data.
  • Morphometric data, despite showing a signal, may not be sufficient for accurate phylogenetic inference.
  • Further research is needed to reconcile morphometric and molecular data in evolutionary studies.