A test of fitness consequences of hybridization in sibling species of Lake Victoria cichlid fish

Journal of Evolutionary Biology
Inke van der SluijsJacques J M van Alphen

Abstract

Several hundred species of haplochromine cichlid fish have evolved rapidly in Lake Victoria. Divergent sexual and ecological selection probably played an important role in this radiation, generating divergent mating preferences and preference-trait covariance. However, the segregation of hybrid inviability or infertility genes could also potentially generate preference-trait covariance, and the mechanisms that cause the evolution of divergent mating preferences have not been investigated in detail in any cichlid species pair. We investigated intrinsic fitness of hybrids between two sister species in the genus Pundamilia, one of the most species-rich genera of Lake Victoria cichlids. Fitness-related traits were measured in nonhybrid offspring of both species, and in the first and second hybrid generations. There were no differences in fecundity, fertility, sex ratio or growth rates either between the sister species or between these and their hybrids. By contrast, there was a difference in offspring survival between the two sister species. Offspring survival was dependent only on the species of the mother, regardless of whether the cross was conspecific or heterospecific. Further, eggs tended to be larger in the hybrids than in o...Continue Reading

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Citations

May 30, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Inke van der SluijsOle Seehausen
Jun 5, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Rike B StelkensOle Seehausen
May 5, 2010·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Louis BernatchezJérôme St-Cyr
Oct 3, 2009·Evolution; International Journal of Organic Evolution·Rike B StelkensOle Seehausen
May 27, 2010·Evolution; International Journal of Organic Evolution·Peter D DijkstraTon G G Groothuis
Sep 3, 2011·Evolution; International Journal of Organic Evolution·Robert Tucker Gilman, Jocelyn E Behm
Jul 14, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Sina J RometschAxel Meyer
Jan 9, 2021·Journal of Anatomy·Javier H Santos-SantosDominique Adriaens
Jul 16, 2021·Evolution; International Journal of Organic Evolution·Nathan J White, Roger K Butlin

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