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DUALCOR: a phylogenetic comparative method to evaluate phylogenetic correlation between a character and a

Norberto P Giannini1,2,3, Pablo A Goloboff1,4

  • 1Unidad Ejecutora Lillo, CONICET / Fundación Miguel Lillo, Miguel Lillo 251, San Miguel de Tucumán, Tucumán, 4000, Argentina.

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PubMed
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A new phylogenetic comparative method, DUALCOR, assesses how evolving traits respond to non-evolving external factors. It uses a permutation test to determine if observed correlations between traits and factors are statistically significant.

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Area of Science:

  • Phylogenetic comparative methods
  • Evolutionary biology
  • Biostatistics

Background:

  • Understanding the evolutionary response of biological characters to external factors is crucial.
  • Existing phylogenetic methods may not adequately address scenarios where external factors are non-evolving or independent of phylogeny.

Purpose of the Study:

  • To introduce DUALCOR, a novel phylogenetic comparative method.
  • To evaluate the evolutionary response of a character to non-evolving external factors, such as environmental variables.
  • To provide a robust statistical framework for assessing correlations between evolving traits and external factors.

Main Methods:

  • DUALCOR treats the character as an evolving trait on a phylogeny and the external factor as independent.
  • It calculates the correlation between observed character values and the external factor.
  • A permutation test is employed by shuffling character changes across the phylogeny to generate null distributions, assessing statistical significance.

Main Results:

  • The DUALCOR method provides a framework for permutation testing using the dual nature of characters.
  • The method satisfies the requirements of Generalized Monte Carlo procedures.
  • An empirical example with a reverse test is presented, demonstrating its applicability.

Conclusions:

  • DUALCOR offers a new approach to disentangle the influence of non-evolving external factors on character evolution.
  • The method allows researchers to rigorously test the significance of observed correlations in phylogenetic comparative studies.
  • It enhances the ability to study trait evolution in the context of environmental or other external influences.