Effects of Interspecific Gene Flow on the Phenotypic Variance-Covariance Matrix in Lake Victoria Cichlids

Lucek, Kay Jurka Olaf; Greuter, Lucie; Selz, Oliver; Seehausen, Ole (2016). Effects of Interspecific Gene Flow on the Phenotypic Variance-Covariance Matrix in Lake Victoria Cichlids. Hydrobiologia, 791(1), pp. 145-154. Springer 10.1007/s10750-016-2838-z

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Quantitative genetics theory predicts adaptive evolution to be constrained along evolutionary lines of least resistance. In theory, hybridization and subsequent interspecific gene flow may however rapidly change the evolutionary constraints of a population and eventually change its evolutionary potential, but empirical evidence is still scarce. Using closely related species pairs of Lake Victoria cichlids sampled from four different islands with different levels of interspecific gene flow, we tested for potential effects of introgressive hybridization on phenotypic evolution in wild populations. We found that these effects differed among our study species. Constraints measured as the eccentricity of phenotypic variance-covariance matrices declined significantly with increasing gene flow in the less abundant species for matrices that have a diverged line of least resistance. In contrast we find no such decline for the more abundant species. Overall our results suggest that hybridization can change the underlying phenotypic variance-covariance matrix, potentially increasing the adaptive potential of such populations.

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:

Lucek, Kay Jurka Olaf; Greuter, Lucie; Selz, Oliver and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0018-8158

Publisher:

Springer

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

12 Jul 2016 11:52

Last Modified:

03 Jun 2017 02:30

Publisher DOI:

10.1007/s10750-016-2838-z

BORIS DOI:

10.7892/boris.82430

URI:

https://boris.unibe.ch/id/eprint/82430

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