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Strongest Evidence: Maximum Apparent Phylogenetic Signal as a New Cladistic Optimality Criterion.

Benjamin A Salisbury1

  • 1Department of Biology, University of Michigan, Ann Arbor, Michigan, 48109-1048.

Cladistics : the International Journal of the Willi Hennig Society
|December 14, 2021
PubMed
Summary

A new phylogenetic inference method, Strongest Evidence (SE), prioritizes characters with minimal homoplasy for robust evolutionary signal. This approach enhances tree resolution by considering tree topology and character states, offering an alternative to traditional methods.

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Area of Science:

  • Phylogenetics
  • Evolutionary Biology
  • Computational Biology

Background:

  • Phylogenetic inference aims to reconstruct evolutionary relationships.
  • Existing methods like parsimony and implied weights have limitations in handling homoplasy and evolutionary rates.
  • Accurate phylogenetic signal detection is crucial for understanding evolutionary history.

Purpose of the Study:

  • Introduce a novel method for phylogenetic inference called Strongest Evidence (SE).
  • To improve the accuracy of phylogenetic tree reconstruction by minimizing implied homoplasy.
  • To provide a new framework for evaluating character support in phylogenetic analyses.

Main Methods:

  • Developed the Strongest Evidence (SE) method for phylogenetic inference.
  • Derived background expectations for character length by modeling dissociation between branching patterns and character states.
  • Compared SE with unweighted parsimony and Goloboff's method of implied weights.
  • Proposed an iterative process for incremental phylogenetic hypothesis resolution.

Main Results:

  • SE identifies character support based on the minimal amount of implied homoplasy.
  • The method accounts for unlabeled tree topology and character state distribution in assessing support.
  • SE offers a distinct approach to quantifying character support compared to parsimony methods.
  • Demonstrated how SE can be used to incrementally resolve phylogenetic hypotheses.

Conclusions:

  • Strongest Evidence (SE) provides a powerful new tool for phylogenetic inference.
  • The method offers a more nuanced assessment of phylogenetic signal by focusing on homoplasy reduction.
  • SE has the potential to improve the accuracy and resolution of evolutionary trees.
  • The iterative approach suggested can enhance cladistic analyses at local levels.