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Evolution of clonality and polyploidy in a weevil system
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology).
2003 (English)In: Molecular biology and evolution, ISSN 0737-4038, Vol. 20, no 10, 1626-1632 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 20, no 10, 1626-1632 p.
Identifiers
URN: urn:nbn:se:umu:diva-5677OAI: oai:DiVA.org:umu-5677DiVA: diva2:145273
Available from: 2007-01-25 Created: 2007-01-25 Last updated: 2016-03-01Bibliographically approved
In thesis
1. Evolution of asexuality in insects: Polyploidy, hybridization and geographical parthenogenesis
Open this publication in new window or tab >>Evolution of asexuality in insects: Polyploidy, hybridization and geographical parthenogenesis
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Asexual reproduction and polyploidy are relatively rare in animals with chromosomal sex determination and always represent a derived condition. To accomplish asexual reproduction several changes in gene expression are required in the mechanism of oogenesis. Polyploidy increases the cell volume and also gives rise to alterations in general physiology. Nevertheless, there are asexual animals that not only survive but seem to be doing better than their sexual progenitors. This is expressed in the distribution pattern called geographical parthenogenesis. Using molecular phylogeny, I here examine the evolution of Otiorynchid weevils, mainly Otiorhynchus scaber and sulcatus in an attempt to trace the evolutionary history and find out what causes the variation in success of different parthenogens. I also evaluate the contribution of asexuality, hybridity and polyploidy as explanations behind geographical parthenogenesis in insects. I conclude that what is called O. scaber is, in fact, a set of geographical polyploids as polyploidy and not asexuality explains the difference in clonal success. I also argue that O. sulcatus is a recently formed clonal species of non-hybrid origin that may well be a good example of a true general purpose genotype. I find little support for asexuality or a hybrid origin as explanations behind geographical parthenogenesis in insects. Finally, I argue that polyploidy in all eukaryotes should be seen as an opportunity for the species evolution, not as a limitation that ensures the demise of the taxa.

Place, publisher, year, edition, pages
Umeå: Molekylärbiologi (Teknisk-naturvetenskaplig fakultet), 2007. 68 p.
Keyword
Molecular genetics, weevils, geographical parthenogenesis, hybridization, polyploidy, Genetik, Otiorhynchus
Research subject
Genetics
Identifiers
urn:nbn:se:umu:diva-980 (URN)978-91-7264-257-7 (ISBN)
Public defence
2007-02-16, Major Groove, 6L, Molekylär Biologi, Umeå Universitet, Umeå, 13:00
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Available from: 2007-01-25 Created: 2007-01-25 Last updated: 2011-03-24Bibliographically approved

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http://dx.doi.org/10.1093/molbev/msg180

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