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Related Experiment Videos

Calibrating the bootstrap test of monophyly

A G Rodrigo1

  • 1School of Biological Sciences, University of Auckland, New Zealand.

International Journal for Parasitology
|July 1, 1993
PubMed
Summary
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The iterated bootstrap method calibrates the bootstrap test for phylogenetic monophyly. This statistical approach improves accuracy in evolutionary analyses, particularly for complex datasets like Platyhelminthes phylogenetics.

Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Bioinformatics

Background:

  • The bootstrap test is commonly used in phylogenetics to assess the robustness of evolutionary relationships.
  • Concerns exist that the standard bootstrap test may be overly conservative, leading to frequent rejection of true monophyly hypotheses.

Purpose of the Study:

  • To introduce and describe the iterated bootstrap method for calibrating hypothesis tests in phylogenetics.
  • To estimate error rates associated with rejecting true monophyly and accepting false monophyly hypotheses.
  • To apply the calibrated test to a high-level phylogenetic analysis of Platyhelminthes.

Main Methods:

  • Development of the iterated bootstrap, a randomization-based method.
  • Estimation of probabilities for Type I (false rejection) and Type II (false acceptance) errors in monophyly testing.

Related Experiment Videos

  • Application to high-level phylogeny reconstruction using 18S ribosomal RNA (rRNA) gene sequences.

    • Main Results:

    • The iterated bootstrap provides a means to adjust the bootstrap test, accounting for its inherent error rates.
    • Phylogenetic analysis of Platyhelminthes using 18S rRNA sequences indicates that current data may not definitively resolve their evolutionary placement.
    • The placement of Platyhelminthes relative to Annelida and Insecta remains ambiguous based on the analyzed data.

    Conclusions:

    • The iterated bootstrap offers a valuable statistical refinement for hypothesis testing in molecular phylogenetics.
    • The study highlights limitations in resolving deep evolutionary relationships within certain metazoan groups using current molecular data.
    • Further investigation with additional data or methods may be required to clarify the phylogenetic position of Platyhelminthes.