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A Practical Guide to Phylogenetics for Nonexperts
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A parametric method for assessing diversification-rate variation in phylogenetic trees.

Premal Shah1, Benjamin M Fitzpatrick, James A Fordyce

  • 1Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Knoxville, Tennessee 37996, USA.

Evolution; International Journal of Organic Evolution
|January 30, 2013
PubMed
Summary
This summary is machine-generated.

We developed Parametric Rate Comparison (PRC), a new method to compare diversification rates among lineages in phylogenetic trees. This method identified a faster diversification rate in the Plethodon glutinosus salamander clade.

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Computational Biology

Background:

  • Phylogenetic hypotheses are crucial for understanding diversification rate variation.
  • Existing methods primarily focus on rate variation through time, with fewer options for comparing rates among groups.
  • Identifying lineage-specific diversification rates can illuminate ecological and evolutionary drivers of cladogenesis.

Purpose of the Study:

  • To introduce Parametric Rate Comparison (PRC), a novel statistical method for comparing diversification rates across lineages within a phylogenetic tree.
  • To provide a tool for identifying subclades with significantly different diversification rates.
  • To enable comparisons among a priori defined groups and accommodate non-monophyletic clades.

Main Methods:

  • Parametric Rate Comparison (PRC) utilizes standard statistical distributions to compare diversification rates among tree lineages.
  • A randomization test assesses the statistical significance of observed rate variations.
  • The method was validated using simulated data to evaluate its performance.

Main Results:

  • Simulated data demonstrated that PRC possesses acceptable false-positive rates and sufficient statistical power.
  • Application to North American Plethodon salamanders supported higher diversification rates in the Plethodon glutinosus clade.
  • PRC successfully identified subclades with divergent diversification histories.

Conclusions:

  • PRC is a robust and versatile method for detecting and comparing diversification rate variation among lineages.
  • The method offers valuable insights into the evolutionary dynamics of clades.
  • The findings support distinct diversification patterns within the Plethodon salamander radiation.