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Molecular Ecology
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Molecular Ecology
Article . 2017 . Peer-reviewed
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On the independent gene trees assumption in phylogenomic studies

Authors: W. Bryan Jennings;

On the independent gene trees assumption in phylogenomic studies

Abstract

Abstract Multilocus coalescent methods for inferring species trees or historical demographic parameters typically require the assumption that gene trees for sampled SNP s or DNA sequence loci are conditionally independent given their species tree. In practice, researchers have used different criteria to delimit “independent loci.” One criterion identifies sampled loci as being independent of each other if they undergo Mendelian independent assortment ( IA criterion). O'Neill et al. (2013, Molecular Ecology , 22, 111–129) used this approach in their phylogeographic study of North American tiger salamander species complex. In two other studies, researchers developed a pair of related methods that employ an independent genealogies criterion ( IG criterion), which considers the effects of population‐level recombination on correlations between the gene trees of intrachromosomal loci. Here, I explain these three methods, illustrate their use with example data, and evaluate their efficacies. I show that the IA approach is more conservative, is simpler to use and requires fewer assumptions than the IG approaches. However, IG approaches can identify much larger numbers of independent loci than the IA method, which, in turn, allows researchers to obtain more precise and accurate estimates of species trees and historical demographic parameters. A disadvantage of the IG methods is that they require an estimate of the population recombination rate. Despite their drawbacks, IA and IG approaches provide molecular ecologists with promising a priori methods for selecting SNP s or DNA sequence loci that likely meet the independence assumption in coalescent‐based phylogenomic studies.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Average
Average
bronze