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Experimental evidence for ovarian hypofunction in sparrow hybrids

Chinese Birds 2016年第1期7卷 79-83页

作者： Fabrice Eroukhmanoff Melissah Rowe Emily R.A.Cramer Fredrik Haas Jo S.Hermansen anna runemark Arild Johnsen Glenn-Peter Saetre Department of Biosciences Center for Ecological and Evolutionary SynthesisUniversity of Oslo Natural History Museum University of Oslo Department of Biology Ecology BuildingLund University

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 ***: 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 ***: 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.

关键词： Hybrid fitness Hybridization Ovary Sparrows Speciation

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