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Related Concept Videos

Microbial Phylogeny01:28

Microbial Phylogeny

Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Phylogenetic Trees03:21

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
Phylogenetic Trees03:21

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...

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A Practical Guide to Phylogenetics for Nonexperts
12:00

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Meta-analysis and the comparative phylogenetic method.

Marc J Lajeunesse1

  • 1Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York 14853, USA. marc.lajeunesse@nescent.org

The American Naturalist
|July 30, 2009
PubMed
Summary
This summary is machine-generated.

Meta-analysis in ecology faces challenges with phylogenetic nonindependence. This study introduces a framework to integrate phylogenetic data, improving synthesis and hypothesis testing in ecological reviews.

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Last Updated: Jun 21, 2026

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Published on: February 5, 2014

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Quantitative Synthesis

Background:

  • Meta-analysis is a key method for synthesizing ecological research.
  • Phylogenetic nonindependence, due to shared ancestry, violates statistical assumptions.
  • This nonindependence can compromise the generalizability of meta-analysis conclusions.

Purpose of the Study:

  • To present a statistical framework integrating phylogenetic information into meta-analysis.
  • To address bias evaluation and phylogenetic nonindependence simultaneously.
  • To enable testing of evolutionary hypotheses within meta-analytic reviews.

Main Methods:

  • Integration of phylogenetic data into weighted averaging of effect sizes (fixed- and random-effects models).
  • Testing for homogeneity of variances with phylogenetic considerations.
  • Methods for evaluating phylogenetic conservatism and competing neutral vs. adaptive hypotheses.

Main Results:

  • A novel statistical framework is proposed for phylogenetic meta-analysis.
  • The framework accounts for nonindependence of taxa, enhancing statistical rigor.
  • Methods are provided for testing evolutionary hypotheses using meta-analytic data.

Conclusions:

  • The proposed framework improves the accuracy and scope of ecological meta-analyses.
  • Integrating phylogenetic data strengthens the validity of synthesized findings.
  • This approach facilitates robust testing of macroevolutionary questions.