A method for investigating relative timing information on phylogenetic trees.

Area of Science:

• Phylogenetics
• Evolutionary Biology
• Computational Biology

Background:

• Existing methods like lineages-through-time plots aggregate diversification.
• A need exists for methods analyzing the relative timing of branching events.

Purpose of the Study:

• To present a new method describing the relative timing of diversification events between sister clades in phylogenetic trees.
• To provide a framework for identifying lineage-specific diversification bursts or regular patterns.

Main Methods:

• Developed a method based on the relative timing of diversification events between sister clades.
• Discussed two classes of neutral models (coalescent with population size variation, global speciation-extinction) for statistical testing.
• Created a statistical framework to test hypotheses against neutral models.

Main Results:

• The method can detect deviations from neutral models, such as the hepatitis C virus evolution deviating from the coalescent model.
• Analysis of ant phylogeny indicates that periods of elevated diversification did not occur in a bursting manner.

Conclusions:

• The new method offers a complementary approach to existing phylogenetic analyses.
• It enables robust statistical testing of diversification patterns against neutral evolutionary models.