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Root location in random trees: a polarity property of all sampling consistent phylogenetic models except one
1Allan Wilson Centre for Molecular Ecology and Evolution, Department of Mathematics and Statistics, University of Canterbury, Christchurch, New Zealand. mike.steel@canterbury.ac.nz
Molecular Phylogenetics and Evolution
|July 10, 2012
Summary
Neutral macroevolutionary models can help pinpoint the root of phylogenetic trees. Most models that treat all species equally provide information about the root
Area of Science:
- Evolutionary biology
- Phylogenetics
- Computational biology
Background:
- Neutral macroevolutionary models, like the Yule model, generate probability distributions for rooted binary trees.
- These models can indicate the root's location in unrooted phylogenetic trees, especially with more species.
Purpose of the Study:
- To investigate which neutral macroevolutionary models provide information about the root's position in unrooted phylogenetic trees.
- To determine if models treating all taxa equally and exhibiting sampling consistency offer root location signals.
Main Methods:
- Analysis of probability distributions generated by neutral macroevolutionary models.
- Comparison of tree distributions under different model assumptions (e.g., equal taxa treatment, sampling consistency).
Main Results:
- Most neutral macroevolutionary models that treat all taxa equally and are sampling consistent provide a signal for the root's location.
- The Proportional-to-Divergence-and-Arrival (PDA) model is the exception, not conveying root information.
Conclusions:
- Several neutral macroevolutionary models offer insights into ancestral root location in phylogenetic trees.
- The findings highlight the utility of specific models for inferring root position, with the PDA model being a notable exception.
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