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The influence of migration on the maintenance of assortative mating
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
2012 (English)In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 83, no 1, 11-15 p.Article in journal (Refereed) Published
Abstract [en]

Rapid speciation has been shown to be plausible without the need for extreme founder events, complete geographical isolation, the existence of distinct adaptive peaks or selection for local adaptation. However, standard theory predicts that extremely low migration rates are enough to hinder divergence between populations, and thus speciation. In this study we asked how low migration rates need to be for divergence to occur and hence for speciation to be possible. We experimentally transferred individual seed beetles, Callosobruchus maculatus, between populations in the laboratory, thus mimicking different rates of migration, and used deviations from Hardy-Weinberg equilibrium as an indicator of assortative mating. We found that assortative mating was upheld for several generations in populations experiencing immigration rates of up to 8% or 13-15 immigrants per generation, despite the lack of adaptive divergence and trade-offs between the exchanging populations. However, after some generations of extensive gene flow and in the absence of selection against hybrids, the system of assortative mating faltered. Based on our results, we conclude that selection is likely to be an important factor in speciation in the face of gene flow and that without it divergence will simply come to a halt.

Place, publisher, year, edition, pages
2012. Vol. 83, no 1, 11-15 p.
Keyword [en]
assortative mating, Callosobruchus maculatus, experimental evidence, migration, parapatric speciation, seed beetle
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-168595DOI: 10.1016/j.anbehav.2011.10.013ISI: 000298149900003OAI: oai:DiVA.org:uu-168595DiVA: diva2:501523
Available from: 2012-02-14 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved

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Rova, EmmaBjörklund, Mats

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