Comparative analysis reveals that polyploidy does not decelerate diversification in fish

TitleComparative analysis reveals that polyploidy does not decelerate diversification in fish
Publication TypeJournal Article
Year of Publication2014
AuthorsZhan, SH, Glick L, Tsigenopoulos CS, Otto SP, Mayrose I
JournalJournal of Evolutionary Biology
Keywordschromosome number, diversification, extinction, genome duplication, polyploidy, Speciation, Teleost fish

While the proliferation of the species-rich teleost fish has been ascribed to an ancient
genome duplication event at the base of this group, the broader impact of polyploidy on fish
evolution and diversification remains poorly understood. Here, we investigate the association
between polyploidy and diversification in several fish lineages: the sturgeons (Acipenseridae:
Acipenseriformes), the botiid loaches (Botiidae: Cypriniformes), Cyprininae fishes (Cyprinidae:
Cypriniformes), and the salmonids (Salmonidae: Salmoniformes). Using likelihood-based
evolutionary methodologies, we co-estimate speciation and extinction rates associated with
polyploid versus diploid fish lineages. Family-level analysis of Acipenseridae and Botiidae
revealed no significant difference in diversification rates between polyploid and diploid relatives,
while analysis of the subfamily Cyprininae revealed higher polyploid diversification.
Additionally, order-level analysis of the polyploid Salmoniformes and its diploid sister clade, the
Esociformes, did not support a significantly different net-diversification rate between the two
groups. Taken together, our results suggest that polyploidy is generally not associated with
decreased diversification in fish—a pattern that stands in contrast to that previously observed in
plants. While there are notable differences in the time frame examined in the two studies, our
results suggest that polyploidy is associated with different diversification patterns in these two
major branches of the eukaryote tree of life

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