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Coding polymorphism for phylogeny reconstruction.

D J Kornet1, H Turner

  • 1Institute of Evolutionary and Ecological Sciences, Leiden University, P.O. Box 9516, 2300 RA Leiden, The Netherlands. kornet@rulsfb.leidenuniv.nl

Systematic Biology
|June 18, 2002
PubMed
Summary
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Coding polymorphic taxa requires careful methodology. The study recommends coding plesiomorphy as the preferred method for accurate phylogenetic analysis, especially when dealing with evolutionary novelties.

Area of Science:

  • Taxonomy
  • Phylogenetics
  • Evolutionary Biology

Background:

  • The coding methodology for polymorphic taxa remains under-explored in taxonomic literature.
  • Existing methods for coding polymorphic characters vary, leading to potential inconsistencies in phylogenetic reconstruction.

Purpose of the Study:

  • To review and categorize existing methods for coding polymorphic taxa.
  • To identify the most reliable method for accurate phylogenetic analysis of polymorphic characters.

Main Methods:

  • A comprehensive search of taxonomic literature was conducted to identify and classify different coding methods for polymorphic taxa.
  • Methods were analyzed based on their approach to evolutionary novelties and reversals.

Main Results:

Related Experiment Videos

  • Seven distinct coding methods were identified, broadly categorized by how they treat the origin versus fixation of new character states.
  • Methods identifying new states with the origin of novelties can introduce soft reversals, potentially leading to cladograms inconsistent with true phylogenies.

Conclusions:

  • Coding plesiomorphy is the recommended method for handling polymorphic taxa, ensuring accurate phylogenetic signals.
  • When the ancestral state is unknown, coding as ambiguous is advised for both species and supraspecific taxa.
  • This approach provides a more robust framework for understanding evolutionary relationships among polymorphic taxa.