Abstract:
:Genome-scale data have the potential to clarify phylogenetic relationships across the tree of life, but have also revealed extensive gene tree conflict. This seeming paradox, whereby larger datasets both increase statistical confidence and uncover significant discordance, suggests that understanding sources of conflict is important for accurate reconstruction of evolutionary history. We explore this paradox in squamate reptiles, the vertebrate clade comprising lizards, snakes, and amphisbaenians. We collected an average of 5103 loci for 91 species of squamates that span higher-level diversity within the clade, which we augmented with publicly available sequences for an additional 17 taxa. Using a locus-by-locus approach, we evaluated support for alternative topologies at 17 contentious nodes in the phylogeny. We identified shared properties of conflicting loci, finding that rate and compositional heterogeneity drives discordance between gene trees and species tree and that conflicting loci rarely overlap across contentious nodes. Finally, by comparing our tests of nodal conflict to previous phylogenomic studies, we confidently resolve nine of the 17 problematic nodes. We suggest this locus-by-locus and node-by-node approach can be used to build consensus on which topological resolutions remain uncertain in phylogenomic studies of other contentious groups.
journal_name
Syst Bioljournal_title
Systematic biologyauthors
Singhal S,Colston TJ,Grundler MR,Smith SA,Costa GC,Colli GR,Moritz C,Pyron RA,Rabosky DLdoi
10.1093/sysbio/syaa054subject
Has Abstractpub_date
2020-07-18 00:00:00eissn
1063-5157issn
1076-836Xpii
5873536pub_type
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