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Conspecific sperm precedence in flour beetles
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
2004 (English)In: Animal Behaviour, Vol. 67, 729-732 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. Vol. 67, 729-732 p.
URN: urn:nbn:se:uu:diva-94086OAI: oai:DiVA.org:uu-94086DiVA: diva2:167819
Available from: 2006-03-17 Created: 2006-03-17 Last updated: 2009-03-31Bibliographically approved
In thesis
1. Postmating Sexual Selection and its Role in Population Divergence in Beetles
Open this publication in new window or tab >>Postmating Sexual Selection and its Role in Population Divergence in Beetles
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Speciation is the process describing the formation of new species and is at the heart of evolutionary biology. According to the biological species concept only reproductively isolated forms are regarded good species. This thesis aims at identifying evolutionary processes that cause population divergence and, ultimately, speciation. Natural and sexual selection are two major candidates driving changes in traits that could render populations reproductively incompatible. In recent years, biologists have recognized that most animal species are polygamous. Therefore, sexual selection does not end at mating but continues to include interactions between individuals after mating has occurred but before zygote formation. Male-male sperm competition and cryptic female choice are two main forms of postmating sexual selection shaping reproductive traits like behaviour. The studies presented in this thesis focus on laboratory experiments attempting to identify the role of postmating sexual selection in causing reproductive divergence across populations in beetles. The majority of studies were performed using a Bruchid beetle, Callosobruchus maculatus, a common, worldwide pest on stored leguminose seeds. I used two major methodological approaches. One approach seeks to identify the traces left by past selection among extant conspecific populations, by assessing the pattern of female reproductive responses to mating with males of decreasing relatedness. Second, I used a selection experiment to disentangle the joint effect of natural and sexual selection acting simultaneously on diverging replicated selection lines. In general, these experiments revealed that postmating sexual selection can be a powerful engine of incipient divergence between allopatric populations. Changes in traits underlying variables such as female reproductive output, female mating rate or male success in sperm competition evolved rapidly and could in some cases effectively reduce gene flow between conspecific populations. While postmating sexual selection per se can drive divergence, I found that interactions with natural selection can limit divergence in reproductive characters. Sexual selection tended to reinforce natural selection under strong directional selection. In contrast, sexual selection inflicted a reproductive load on populations under weak natural selection. Thus, the joint effects of natural and sexual selection on allopatric populations are non-trivial and should be considered in greater detail in future studies of early divergence.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 45 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 152
Biology, Callosobruchus maculatus, postmating sexual selection, speciation, laboratory selection experiment, divergence, Biologi
National Category
Biological Sciences
urn:nbn:se:uu:diva-6583 (URN)91-554-6482-3 (ISBN)
Public defence
2006-04-07, Friessalen, Evolutionary Ecology Centre, Uppsala, 10:00 (English)
Available from: 2006-03-17 Created: 2006-03-17 Last updated: 2009-03-31Bibliographically approved

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