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Experimental evidence for ovarian hypofunction in sparrow hybrids

Eroukhmanoff, Fabrice; Rowe, Melissah; Cramer, Emily R.A.; Haas, Fredrik LU ; Hermansen, Jo S.; Runemark, Anna; Johnsen, Arild and Glenn-Peter, Sætre (2016) In Avian Research 7(1). p.1-5
Abstract

Background
Postzygotic isolation in the form of reduced viability and/or fertility of hybrids may help maintain species boundaries in the face of interspecific gene flow. Past hybridization events between house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis) have given rise to a homoploid hybrid species, the Italian sparrow (P. italiae). Although genetic incompatibilities are known to isolate these three species, the biological consequences of these incompatibilities are still unknown in early generation hybrids.

Methods
We investigated whether F1 hybrids between house and Spanish sparrows experience reduced viability or fertility. More specifically, we generated hybrids through controlled... (More)

Background
Postzygotic isolation in the form of reduced viability and/or fertility of hybrids may help maintain species boundaries in the face of interspecific gene flow. Past hybridization events between house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis) have given rise to a homoploid hybrid species, the Italian sparrow (P. italiae). Although genetic incompatibilities are known to isolate these three species, the biological consequences of these incompatibilities are still unknown in early generation hybrids.

Methods
We investigated whether F1 hybrids between house and Spanish sparrows experience reduced viability or fertility. More specifically, we generated hybrids through controlled crosses in aviaries, and compared ovaries of female hybrids with female of pure-species sparrows.

Results
We found that overall, hybrid ovaries were underdeveloped and that half of all female hybrids exhibited symptoms of ovarian hypofunction (ovarian atrophy and complete absence of developed follicles).

Conclusions
Fertility in hybrids is a common consequence or post-zygotic barriers between species. We discuss these results in light of previous findings on genetic incompatibilities between the parent species and the potential role of incompatibilities in hybrid speciation, a rare evolutionary process in birds.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hybrid fitness, hybridisation, Speciation, Passer hispaniolensis, Passer domesticus
in
Avian Research
volume
7
issue
1
pages
5 pages
DOI
10.1186/s40657-016-0038-1
language
English
LU publication?
yes
id
4c057cca-a7f7-4791-8dfc-23e639181e38
date added to LUP
2016-04-11 16:03:58
date last changed
2016-04-12 14:58:13
@misc{4c057cca-a7f7-4791-8dfc-23e639181e38,
  abstract     = {<br/>Background<br/>Postzygotic isolation in the form of reduced viability and/or fertility of hybrids may help maintain species boundaries in the face of interspecific gene flow. Past hybridization events between house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis) have given rise to a homoploid hybrid species, the Italian sparrow (P. italiae). Although genetic incompatibilities are known to isolate these three species, the biological consequences of these incompatibilities are still unknown in early generation hybrids.<br/><br/>Methods<br/>We investigated whether F1 hybrids between house and Spanish sparrows experience reduced viability or fertility. More specifically, we generated hybrids through controlled crosses in aviaries, and compared ovaries of female hybrids with female of pure-species sparrows.<br/><br/>Results<br/>We found that overall, hybrid ovaries were underdeveloped and that half of all female hybrids exhibited symptoms of ovarian hypofunction (ovarian atrophy and complete absence of developed follicles).<br/><br/>Conclusions<br/>Fertility in hybrids is a common consequence or post-zygotic barriers between species. We discuss these results in light of previous findings on genetic incompatibilities between the parent species and the potential role of incompatibilities in hybrid speciation, a rare evolutionary process in birds.<br/>},
  author       = {Eroukhmanoff, Fabrice and Rowe, Melissah and Cramer, Emily R.A. and Haas, Fredrik and Hermansen, Jo S. and Runemark, Anna and Johnsen, Arild and Glenn-Peter, Sætre},
  keyword      = {Hybrid fitness,hybridisation,Speciation,Passer hispaniolensis,Passer domesticus},
  language     = {eng},
  number       = {1},
  pages        = {1--5},
  series       = {Avian Research},
  title        = {Experimental evidence for ovarian hypofunction in sparrow hybrids},
  url          = {http://dx.doi.org/10.1186/s40657-016-0038-1},
  volume       = {7},
  year         = {2016},
}