Can sympatric speciation by disruptive sexual selection explain rapid evolution of cichlid diversity in Lake Victoria?

Seehausen, Ole; van Alphen, JJM (1999). Can sympatric speciation by disruptive sexual selection explain rapid evolution of cichlid diversity in Lake Victoria? Ecology Letters, 2(4), pp. 262-271. Wiley-Blackwell Publishing 10.1046/j.1461-0248.1999.00082.x

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Rapid speciation can occur on ecological time scales and interfere with ecological processes, resulting in species distribution patterns that are difficult to reconcile with ecological theory. The haplochromine cichlids in East African lakes are an extreme example of rapid speciation. We analyse the causes of their high speciation rates. Various studies have identified disruptive sexual selection acting on colour polymorphisms that might cause sympatric speciation. Using data on geographical distribution, colouration and relatedness from 41 species endemic to Lake Victoria, we test predictions from this hypothesis. Plotting numbers of pairs of closely related species against the amount of distributional overlap between the species reveals a bimodal distribution with modes on allopatric and sympatric. The proportion of sister species pairs that are heteromorphic for the traits under disruptive selection is higher in sympatry than in allopatry. These data support the hypothesis that disruptive sexual selection on colour polymorphisms has caused sympatric speciation and help to explain the rapid radiation of haplochromine species flocks.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1461-023X

Publisher:

Wiley-Blackwell Publishing

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

04 Sep 2015 11:32

Last Modified:

04 Sep 2015 11:32

Publisher DOI:

10.1046/j.1461-0248.1999.00082.x

BORIS DOI:

10.7892/boris.71529

URI:

https://boris.unibe.ch/id/eprint/71529

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