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Can preference for oviposition sites initiate reproductive isolation in Callosobruchus maculatus?
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.
2011 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 6, no 1, e14628- p.Article in journal (Refereed) Published
Abstract [en]

Theory has identified a variety of evolutionary processes that may lead to speciation. Our study includes selection experiments using different host plants and test key predictions concerning models of speciation based on host plant choice, such as the evolution of host use (preference and performance) and assortative mating. This study shows that after only ten generations of selection on different resources/hosts in allopatry, strains of the seed beetle Callosobruchus maculatus develop new resource preferences and show resource-dependent assortative mating when given the possibility to choose mates and resources during secondary contact. The resulting reduced gene flow between the different strains remained for two generations after contact before being overrun by disassortative mating. We show that reduced gene flow can evolve in a population due to a link between host preference and assortative mating, although this result was not found in all lines. However, consistent with models of speciation, assortative mating alone is not sufficient to maintain reproductive isolation when individuals disperse freely between hosts. We conclude that the evolution of reproductive isolation in this system cannot proceed without selection against hybrids. Other possible factors facilitating the evolution of isolation would be longer periods of allopatry, the build up of local adaptation or reduced migration upon secondary contact.

Place, publisher, year, edition, pages
2011. Vol. 6, no 1, e14628- p.
Keyword [en]
speciation, assortative mating, resource preference, Callosobruchus maculatus, experiment
National Category
Biological Sciences
Research subject
Biology with specialization in Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-130112DOI: 10.1371/journal.pone.0014628ISI: 000286834300010PubMedID: 21297947OAI: oai:DiVA.org:uu-130112DiVA: diva2:346460
Available from: 2010-09-01 Created: 2010-09-01 Last updated: 2016-04-18Bibliographically approved
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, EmmaBjörklund, Mats

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