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Hybrid speciation through sorting of parental incompatibilities in Italian sparrows

Hermansen, Jo S.; Haas, Fredrik LU ; Trier, Cassandra N.; Bailey, Richard I.; Nederbragt, Alexander J.; Marzal, Alfonso and Sætre, Glenn-Peter (2014) In Molecular Ecology 23. p.5831-5842
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... (More)
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 Italian sparrow at its two geographically separated hybrid–parent boundaries represent a subset of those contributing to reproductive isolation between its parent species, house and Spanish 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.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
birds, hybridisation, introgression, Passer, reproductive barriers
in
Molecular Ecology
volume
23
pages
9 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:84912073841
ISSN
0962-1083
DOI
10.1111/mec.12910
language
English
LU publication?
yes
id
1f97393c-4f72-4fd2-818c-a504e3abd60e
date added to LUP
2016-04-11 15:22:59
date last changed
2017-08-13 04:53:31
@article{1f97393c-4f72-4fd2-818c-a504e3abd60e,
  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 Italian sparrow at its two geographically separated hybrid–parent boundaries represent a subset of those contributing to reproductive isolation between its parent species, house and Spanish 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.<br/>},
  author       = {Hermansen, Jo S. and Haas, Fredrik and Trier, Cassandra N. and Bailey, Richard I. and Nederbragt, Alexander J. and Marzal, Alfonso and Sætre, Glenn-Peter},
  issn         = {0962-1083},
  keyword      = {birds,hybridisation,introgression,Passer,reproductive barriers},
  language     = {eng},
  pages        = {5831--5842},
  publisher    = {Wiley-Blackwell},
  series       = {Molecular Ecology},
  title        = {Hybrid speciation through sorting of parental incompatibilities in Italian sparrows},
  url          = {http://dx.doi.org/10.1111/mec.12910},
  volume       = {23},
  year         = {2014},
}