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The influence of migration on the maintanance of assortative mating
Uppsala University, Disciplinary Domain of Science and Technology.
Uppsala University, Disciplinary Domain of Science and Technology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Rapid speciation has been shown plausible without the need for extreme founder events, complete geographic 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. Our question to be answered is at which migration rates divergence, and hence speciation is still possible. Is it really as strict as theory predicts? We show that assortative mating can be upheld for several generations in populations experiencing immigration rates of up to eight percent, or 13-15 immigrants per generation, despite the lack of adaptive divergence and trade-offs between the exchanging populations. Since assortative mating vanishes after some generations of extensive gene flow without selection against hybrids, we conclude that selection is likely to be an important factor in speciation in the face of gene flow.

Keyword [en]
Parapatric speciation, migration, assortative mating, Callosobruchus maculatus, experimental evidence
National Category
Biological Sciences
Research subject
Biology with specialization in Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-130378OAI: oai:DiVA.org:uu-130378DiVA: diva2:349499
Available from: 2010-09-07 Created: 2010-09-07 Last updated: 2012-06-26
In thesis
1. The role of Assortative Mating in the Initial Stages of Sympatric and Parapatric Speciation
Open this publication in new window or tab >>The role of Assortative Mating in the Initial Stages of Sympatric and Parapatric Speciation
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Divergence in the face of gene flow is perhaps the most wildly disputed subject among researchers through time. The debate is an old one and we find its origin as far back as the era of Darwin. The theories dealing with sympatric and parapatric speciation, its processes and ecological conditions, are numerous and the empirical data supporting the ideas is constantly growing. However, the reach of a consensus almost seem as distant as ever. Two fundamental prerequisites can be identified for the evolution of divergence with gene flow, the act of disruptive selection, and the development of assortative mating. A set of models in which speciation with gene flow seem particularly likely is when a shift occurs in host preference in phytophagous insects and mating takes place on the host. In the work behind this thesis, the role of assortative mating in the initial stages of sympatric and parapatric speciation has been studied, as has the interaction between assortative mating and inbreeding and how it effects speciation in small sympatric populations, an aspect not much attended to earlier in the literature. My results show that assortative mating based on resource preference, can evolve rapidly upon secondary contact, and even in parapatric populations with a migration rate of 8% (13-15 individuals) per generation. However for assortative mating to be maintained selection against hybrids is needed. My results also suggests that small inbred populations have a hard time coping with strong assortative mating an as a consequence tend to relax their mating preferences to avoid inbreeding depression. Based on these results, I advocate for the importance of considering not only assortative mating in itself, but also the joint effects of assortative mating and inbreeding when dealing with theories of speciation with gene flow.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 34 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 765
Keyword
Callosobruchus maculatus, host fidelity, assortative mating, inbreeding, experimental evidence, sympatric speciation, parapatric speciation
National Category
Biological Sciences
Research subject
Biology with specialization in Animal Ecology
Identifiers
urn:nbn:se:uu:diva-130764 (URN)978-91-554-7889-6 (ISBN)
Public defence
2010-10-15, Zootissalen, EBC, Norbyv. 18, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2010-09-23 Created: 2010-09-13 Last updated: 2016-04-22Bibliographically approved

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Rova, Emma

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