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Female modulation of reproductive rate and its role in postmating prezygotic isolation in Callosobruchus maculatus.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
2006 (English)In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 20, no 2, 360-368 p.Article in journal (Refereed) Published
Abstract [en]

Summary:

1. Mechanisms that come into play after mating but prior to fertilization can prevent hybrid formation and thus promote reproductive isolation. Recent research indicates that the evolution of such barriers to gene exchange between incipient forms appears to be common and is essential for speciation.

2. We aimed to test if female Bean Weevils (Callosobruchus maculatus) modulate their reproductive rate and/or remating propensity in response to mating with males with varying degrees of relatedness in a manner that limits the number of ‘hybrids’ produced. We also tested if remating with a male from a female's own population, following a first mating with a foreign male, would elevate egg production.

3. Females varied their egg-production rate depending on the relatedness of their mates, but this effect was not in the predicted direction. Heterospecific C. analis males actually elicited the strongest reproductive response in females, which resulted in up to 9% higher egg production. Male relatedness did not significantly affect female propensity to remate with a second male. Further, females did not generally show a compensatory increase in reproductive rate following rematings with males from their own population.

4. The mechanisms documented here do not act to limit gene flow and are costly to females, as they suffer reduced life span and egg production late in life following a high reproductive rate early in life. We suggest that sexually antagonistic coevolution within species may have caused the pattern observed.

Place, publisher, year, edition, pages
2006. Vol. 20, no 2, 360-368 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-94085DOI: 10.1111/j.1365-2435.2006.01102.xOAI: oai:DiVA.org:uu-94085DiVA: diva2:167818
Available from: 2006-03-17 Created: 2006-03-17 Last updated: 2013-09-13Bibliographically 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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 152
Keyword
Biology, Callosobruchus maculatus, postmating sexual selection, speciation, laboratory selection experiment, divergence, Biologi
National Category
Biological Sciences
Identifiers
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)
Opponent
Supervisors
Available from: 2006-03-17 Created: 2006-03-17 Last updated: 2009-03-31Bibliographically approved

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Arnqvist, Göran

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