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CONFIDENCE LIMITS ON PHYLOGENIES: THE BOOTSTRAP REVISITED.

Michael J Sanderson1

  • 1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, U.S.A.

Cladistics : the International Journal of the Willi Hennig Society
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Summary

This study introduces novel bootstrap methods for robust phylogenetic analysis, offering new insights into evolutionary relationships even when confidence in individual clades is low. These techniques enhance understanding of taxonomic composition and phylogenetic positioning.

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Area of Science:

  • Phylogenetics
  • Statistical analysis
  • Evolutionary biology

Background:

  • The bootstrap is a common non-parametric statistical method for assessing confidence limits in phylogenetics.
  • The standard bootstrap application focuses on testing the monophyly of individual clades.
  • Phylogenetic analyses often yield low confidence in many clades, limiting traditional bootstrap utility.

Purpose of the Study:

  • To propose and illustrate additional applications of the bootstrap for phylogenetic analysis.
  • To provide methods for gaining phylogenetic information when traditional clade support is weak.
  • To explore bootstrap applications for assessing entire phylogenetic topologies.

Main Methods:

  • Utilizing the bootstrap to constrain the phylogenetic position of taxa by examining the size of the smallest monophyletic groups containing them.
  • Determining the taxonomic composition and relative likelihood of occurrence for larger clades.
  • Employing the bootstrap to estimate the sampling distribution of tree similarity indices for evaluating overall topologies.

Main Results:

  • Demonstrated that bootstrap analysis provides valuable phylogenetic information beyond clade support, even with low confidence in individual groups.
  • Showcased methods to infer taxonomic composition and evolutionary likelihood of larger clades.
  • Illustrated the application of bootstrap for assessing tree similarity and overall phylogenetic hypotheses.

Conclusions:

  • The bootstrap offers versatile applications in phylogenetics, extending beyond simple clade support.
  • New bootstrap approaches provide robust phylogenetic insights, especially in challenging datasets with limited clade confidence.
  • These methods enhance the understanding of evolutionary relationships and phylogenetic structure.