Abstract:
:Because of the stochastic way in which lineages sort during speciation, gene trees may differ in topology from each other and from species trees. Surprisingly, assuming that genetic lineages follow a coalescent model of within-species evolution, we find that for any species tree topology with five or more species, there exist branch lengths for which gene tree discordance is so common that the most likely gene tree topology to evolve along the branches of a species tree differs from the species phylogeny. This counterintuitive result implies that in combining data on multiple loci, the straightforward procedure of using the most frequently observed gene tree topology as an estimate of the species tree topology can be asymptotically guaranteed to produce an incorrect estimate. We conclude with suggestions that can aid in overcoming this new obstacle to accurate genomic inference of species phylogenies.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Degnan JH,Rosenberg NAdoi
10.1371/journal.pgen.0020068subject
Has Abstractpub_date
2006-05-01 00:00:00pages
e68issue
5eissn
1553-7390issn
1553-7404journal_volume
2pub_type
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