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The phylogenomic forest of bird trees contains a hard polytomy at the root of Neoaves
Author(s) -
Suh Alexander
Publication year - 2016
Publication title -
zoologica scripta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 64
eISSN - 1463-6409
pISSN - 0300-3256
DOI - 10.1111/zsc.12213
Subject(s) - phylogenomics , biology , phylogenetic tree , evolutionary biology , supermatrix , phylogenetics , zoology , clade , genetics , mathematics , current algebra , affine lie algebra , gene , pure mathematics , algebra over a field
Birds have arguably been the most intensely studied animal group for their phylogenetic relationships. However, the recent advent of genome‐scale phylogenomics has made the forest of bird phylogenies even more complex and confusing. Here, in this perspective piece, I show that most parts of the avian Tree of Life are now firmly established as reproducible phylogenetic hypotheses. This is to the exception of the deepest relationships among Neoaves. Using phylogenetic networks and simulations, I argue that the very onset of the super‐rapid neoavian radiation is irresolvable because of eight near‐simultaneous speciation events. Such a hard polytomy of nine taxa translates into 2 027 025 possible rooted bifurcating trees. Accordingly, recent genome‐scale phylogenies show extremely complex conflicts in this (and only this) part of the avian Tree of Life. I predict that the upcoming years of avian phylogenomics will witness many more, highly conflicting tree topologies regarding the early neoavian polytomy. I further caution against bootstrapping in the era of genomics and suggest to instead use reproducibility (e.g. independent methods or data types) as support for phylogenetic hypotheses. The early neoavian polytomy coincides with the Cretaceous–Paleogene (K‐Pg) mass extinction and is, to my knowledge, the first empirical example of a hard polytomy.