Experimental evidence for ovarian hypofunction in sparrow hybrids

Fabrice Eroukhmanoff; Melissah Rowe; Emily R. A. Cramer; Fredrik Haas; Jo S. Hermansen; Anna Runemark; Arild Johnsen; Glenn-Peter Sætre

doi:10.1186/s40657-016-0038-1

Avian Research 2016, 7(1): 3 https://doi.org/10.1186/s40657-016-0038-1

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Open Access | Issue | Published: 24 February 2016

Experimental evidence for ovarian hypofunction in sparrow hybrids

Show Author's Information Hide Author's Information Fabrice Eroukhmanoff^¹, Melissah Rowe^{¹^,²}, Emily R. A. Cramer^², Fredrik Haas^³, Jo S. Hermansen^¹, Anna Runemark^{¹^,³}, Arild Johnsen^², Glenn-Peter Sætre^¹

Department of Biosciences, Center for Ecological and Evolutionary Synthesis, University of Oslo, PO Box 1066, Blindern, 0316 Oslo, Norway

Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318 Oslo, Norway

Department of Biology, Ecology Building, Lund University, 223 62 Lund, Sweden

Keywords:

Speciation, Hybridization, Hybrid ftness, Ovary, Sparrows

Cite this article:

Eroukhmanoff F, Rowe M, Cramer ERA, et al. Experimental evidence for ovarian hypofunction in sparrow hybrids. Avian Research, 2016, 7(1): 3. https://doi.org/10.1186/s40657-016-0038-1

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Abstract Full text About this article

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 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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About this article

Experimental evidence for ovarian hypofunction in sparrow hybrids

Show Author's information Hide Author's Information Fabrice Eroukhmanoff^¹, Melissah Rowe^{¹^,²}, Emily R. A. Cramer^², Fredrik Haas^³, Jo S. Hermansen^¹, Anna Runemark^{¹^,³}, Arild Johnsen^², Glenn-Peter Sætre^¹

Department of Biosciences, Center for Ecological and Evolutionary Synthesis, University of Oslo, PO Box 1066, Blindern, 0316 Oslo, Norway

Natural History Museum, University of Oslo, PO Box 1172, Blindern, 0318 Oslo, Norway

Department of Biology, Ecology Building, Lund University, 223 62 Lund, Sweden

Abstract

Background

Methods

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

Keywords: Speciation, Hybridization, Hybrid ftness, Ovary, Sparrows

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Publication history

Acknowledgements

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Publication history

Received: 16 September 2015

Accepted: 12 February 2016

Published: 24 February 2016

Issue date: January 2016

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Acknowledgements

We thank the numerous assistants who helped in the field and during the experimental phase of this project. This study was funded by the Research Council of Norway (GPS, AJ), the Swedish Research Council (FH, FE, AR), the University of Oslo (JSH) and the Marie-Curie Foundation (FE). All authors declare that the present study complies with the current laws and ethical standards of animal research in Norway. Ethical permission was issued to F. Haas and M. Rowe (Norwegian Animal Research Authority-FOTS ID 2394 and Norwegian Animal Research Authority-FOTS ID 6323).

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