Assortative mating among Lake Malawi cichlid fish populations is not simply predictable from male nuptial colour

Blais, Jonatan, Plenderleith, Martin, Rico, Ciro, Taylor, Martin I., Seehausen, Ole, van Oosterhout, Cock and Turner, George F. (2009) Assortative mating among Lake Malawi cichlid fish populations is not simply predictable from male nuptial colour. BMC Evolutionary Biology, 9. ISSN 1471-2148

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Abstract

Background. Research on the evolution of reproductive isolation in African cichlid fishes has largely focussed on the role of male colours and female mate choice. Here, we tested predictions from the hypothesis that allopatric divergence in male colour is associated with corresponding divergence in preference. Methods. We studied four populations of the Lake Malawi Pseudotropheus zebra complex. We predicted that more distantly-related populations that independently evolved similar colours would interbreed freely while more closely-related populations with different colours mate assortatively. We used microsatellite genotypes or mesh false-floors to assign paternity. Fisher's exact tests as well as Binomial and Wilcoxon tests were used to detect if mating departed from random expectations. Results. Surprisingly, laboratory mate choice experiments revealed significant assortative mating not only between population pairs with differently coloured males, but between population pairs with similarly-coloured males too. This suggested that assortative mating could be based on non-visual cues, so we further examined the sensory basis of assortative mating between two populations with different male colour. Conducting trials under monochromatic (orange) light, intended to mask the distinctive male dorsal fin hues (blue v orange) of these populations, did not significantly affect the assortative mating by female P. emmiltos observed under control conditions. By contrast, assortative mating broke down when direct contact between female and male was prevented. Conclusion. We suggest that non-visual cues, such as olfactory signals, may play an important role in mate choice and behavioural isolation in these and perhaps other African cichlid fish. Future speciation models aimed at explaining African cichlid radiations may therefore consider incorporating such mating cues in mate choice scenarios.

Item Type: Article
Additional Information: © Blais et al. 2009 This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Science > School of Environmental Sciences
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Depositing User: Rachel Snow
Date Deposited: 24 Feb 2011 15:41
Last Modified: 06 May 2020 23:42
URI: https://ueaeprints.uea.ac.uk/id/eprint/24652
DOI: 10.1186/1471-2148-9-53

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