Prevalence of disruptive selection predicts extent of species differentiation in Lake Victoria cichlids

van Rijssel, Jacco C.; Moser, Florian Nicolo; Frei, David; Seehausen, Ole (2018). Prevalence of disruptive selection predicts extent of species differentiation in Lake Victoria cichlids. Proceedings of the Royal Society. Series B - biological sciences, 285(1871), p. 20172630. Royal Society of London 10.1098/rspb.2017.2630

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Theory suggests that speciation with gene flowis most likely when both sexual and ecological selection are divergent or disruptive. Divergent sexual and natural selection on the visual system have been demonstrated before in sympatric, morphologically similar sister species of Lake Victoria cichlids, but this does not explain the subtle morphological differences between them. To investigate the significance of natural selection on morphology during speciation, we here ask whether the prevalence of disruptive ecological selection differs between sympatric sister species that are at different stages of speciation. Some of our species pairs do (Pundamilia) and others do not (Neochromis) differ distinctively in sexually selected male nuptial coloration. We find that (i) evidence for disruptive selection, and for evolutionary response to it, is prevalent in traits that are differentiated between sister species; (ii) prevalence of both predicts the extent of genetic differentiation; and (iii) genetic differentiation is weaker in species pairs with conserved male nuptial coloration. Our results speak to the existence of two different mechanisms of speciation with gene flow: speciation mainly by sexual selection tightly followed by ecological character displacement in some cases and speciation mainly by divergent ecological selection in others.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Moser, Florian Nicolo; Frei, David and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0962-8452

Publisher:

Royal Society of London

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

11 Apr 2018 12:37

Last Modified:

15 Apr 2018 02:18

Publisher DOI:

10.1098/rspb.2017.2630

BORIS DOI:

10.7892/boris.110264

URI:

https://boris.unibe.ch/id/eprint/110264

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