Hybrid speciation through sorting of parental incompatibilities in I talian sparrows

Abstract Speciation by hybridization is emerging as a significant contributor to biological diversification. Yet, little is known about the relative contributions of (i) evolutionary novelty and (ii) sorting of pre‐existing parental incompatibilities to the build‐up of reproductive isolation under t...

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Published in:Molecular ecology 2014-12, Vol.23 (23), p.5831-5842
Main Authors: Hermansen, Jo S., Haas, Fredrik, Trier, Cassandra N., Bailey, Richard I., Nederbragt, Alexander J., Marzal, Alfonso, Sætre, Glenn‐Peter
Format: Article
Language:English
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Summary:Abstract Speciation by hybridization is emerging as a significant contributor to biological diversification. Yet, little is known about the relative contributions of (i) evolutionary novelty and (ii) sorting of pre‐existing parental incompatibilities to the build‐up of reproductive isolation under this mode of speciation. Few studies have addressed empirically whether hybrid animal taxa are intrinsically isolated from their parents, and no study has so far investigated by which of the two aforementioned routes intrinsic barriers evolve. Here, we show that sorting of pre‐existing parental incompatibilities contributes to intrinsic isolation of a hybrid animal taxon. Using a genomic cline framework, we demonstrate that the sex‐linked and mitonuclear incompatibilities isolating the homoploid hybrid I talian sparrow at its two geographically separated hybrid–parent boundaries represent a subset of those contributing to reproductive isolation between its parent species, house and S panish sparrows. Should such a sorting mechanism prove to be pervasive, the circumstances promoting homoploid hybrid speciation may be broader than currently thought, and indeed, there may be many cryptic hybrid taxa separated from their parent species by sorted, inherited incompatibilities.
ISSN:0962-1083
1365-294X
DOI:10.1111/mec.12910