A phylogenomic perspective on diversity, hybridization and evolutionary affinities in the stickleback genus Pungitius

Molecular Ecology
Baocheng GuoJuha Merilä

Abstract

Hybridization and convergent evolution are phenomena of broad interest in evolutionary biology, but their occurrence poses challenges for reconstructing evolutionary affinities among affected taxa. Sticklebacks in the genus Pungitius are a case in point: evolutionary relationships and taxonomic validity of different species and populations in this circumpolarly distributed species complex remain contentious due to convergent evolution of traits regarded as diagnostic in their taxonomy, and possibly also due to frequent hybridization among taxa. To clarify the evolutionary relationships among different Pungitius species and populations globally, as well as to study the prevalence and extent of introgression among recognized species, genomic data sets of both reference genome-anchored single nucleotide polymorphisms and de novo assembled RAD-tag loci were constructed with RAD-seq data. Both data sets yielded topologically identical and well-supported species trees. Incongruence between nuclear and mitochondrial DNA-based trees was found and suggested possibly frequent hybridization and mitogenome capture during the evolution of Pungitius sticklebacks. Further analyses revealed evidence for frequent nuclear genetic introgression a...Continue Reading

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Citations

Dec 12, 2020·IScience·M Lisette Delgado, Daniel E Ruzzante
Jan 24, 2021·Journal of Fish Biology·Bruno GuinandChristelle Tougard
May 7, 2021·Molecular Ecology Resources·Mikko KivikoskiJuha Merilä
May 7, 2021·Molecular Biology and Evolution·Bohao FangJuha Merilä

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