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EVOLUTIONARY CHARACTER ANALYSIS: TRACING CHARACTER CHANGE ON A CLADOGRAM.

M F Mickevich1, S J Weller2

  • 1Department of Entomology, University of Maryland, College Park, Maryland 20742, U.S.A.

Cladistics : the International Journal of the Willi Hennig Society
|December 22, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces Evolutionary Character Analysis, defining its components and a new numerical coding method (ordinal coding) for character state trees. It proposes integrating biological and cladogram evidence for robust phylogenetic inference and evolutionary studies.

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Area of Science:

  • * Evolutionary Biology
  • * Systematics
  • * Phylogenetics

Background:

  • * Character analysis is crucial for phylogenetic inference but lacks formal discussion.
  • * Character state trees are central to cladistics and phylogenetic analyses.
  • * Existing methods for character analysis can be complex and data-intensive.

Purpose of the Study:

  • * To formally define components of Evolutionary Character Analysis.
  • * To introduce a novel numerical coding method (ordinal coding) for character state trees.
  • * To advocate for integrating biological evidence and cladogram data for robust phylogenetic inference.

Main Methods:

  • * Definition of key components: character state trees, transmodal characters, cladogram characters, and phylogenies.
  • * Introduction of ordinal coding for simplifying complex character state trees and reducing data matrix size.
  • * Advocacy for using both biological evidence and cladogram-internal evidence to construct character state trees.

Main Results:

  • * Ordinal coding reduces data matrix size and facilitates state code retrieval for complex character state trees.
  • * A framework for contrasting transmodal characters (theory-based) with cladogram characters (data-derived) is presented.
  • * Transformation Series Analysis (TSA) is proposed as a method for testing transmodal characters against cladogram characters.

Conclusions:

  • * Evolutionary Character Analysis provides a structured approach to phylogenetic inference.
  • * Ordinal coding offers a more efficient method for handling complex character data.
  • * The integration of character state trees, cladogram characters, and TSA enhances hypothesis testing in evolutionary studies.