Addressing incomplete lineage sorting and paralogy in the inference of uncertain salmonid phylogenetic relationships

PeerJ
Matthew A CampbellJ Andrés López

Abstract

Recent and continued progress in the scale and sophistication of phylogenetic research has yielded substantial advances in knowledge of the tree of life; however, segments of that tree remain unresolved and continue to produce contradicting or unstable results. These poorly resolved relationships may be the product of methodological shortcomings or of an evolutionary history that did not generate the signal traits needed for its eventual reconstruction. Relationships within the euteleost fish family Salmonidae have proven challenging to resolve in molecular phylogenetics studies in part due to ancestral autopolyploidy contributing to conflicting gene trees. We examine a sequence capture dataset from salmonids and use alternative strategies to accommodate the effects of gene tree conflict based on aspects of salmonid genome history and the multispecies coalescent. We investigate in detail three uncertain relationships: (1) subfamily branching, (2) monophyly of Coregonus and (3) placement of Parahucho. Coregoninae and Thymallinae are resolved as sister taxa, although conflicting topologies are found across analytical strategies. We find inconsistent and generally low support for the monophyly of Coregonus, including in results of...Continue Reading

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Software Mentioned

GT
RAxML
ILLUMINACLIP
StarBEAST2
Trimmomatic
EST
R package phybase
ModelGenerator
CONSEL
PartitionFinder

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