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Evolutionary diversification of the bean beetle genus Callosobruchus (Coleoptera: Bruchidae): Traits associated with stored-product pest status
Uppsala universitet.
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2006 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 15, no 12, 3541-3551 p.Article in journal (Refereed) Published
Abstract [en]

Despite the fact that many plant-feeding insects are pests, little effort has been paid to elucidating key evolutionary trait transitions that allow taxa to acquire or lose pest status. A large proportion of species in the genus Callosobruchus are economically important pests of stored, dry post-harvest beans of the tribe Phaseoleae. However, the evolution of this feeding habit is poorly understood. Here, we present a reconstruction of the phylogeny of the Asian and African Callosobruchus based on three mitochondrial genes, and assess which traits have been associated with the evolutionary origin or loss of ability to reproduce on dry beans. Our phylogenetic analysis showed that species group into the chinensis and the maculatus clades, which are also supported by genital morphology, and an additional paraphyletic group. Ancestral ability to use dry beans has been lost in the chinensis clade but acquired again in C. chinensis. Dry-bean use and host-plant use were both phylogenetically constrained and transitions in the two were significantly correlated. Host shifts from the subtribe Phaseolinae to Cajaninae were more common than the reverse and were more likely in species using young beans. Ability to use dry beans was more likely gained when using Phaseolinae hosts and promoted habitat shifts from tropical to temperate regions. Adaptation to arid climate was associated with ability to reproduce on dry beans and on Phaseolinae. Thus, our analysis suggests that physiological adaptations to arid season and to Phaseolinae hosts both render beetles predisposed to become pests of cultivated beans.

Place, publisher, year, edition, pages
2006. Vol. 15, no 12, 3541-3551 p.
Keyword [en]
Bayesian inference, COI and COII, Fabaceae, host-plant shift, plant-herbivore interactions, Wolbachia
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-61559DOI: 10.1111/j.1365-294X.2006.03030.xOAI: diva2:436319
Available from: 2011-08-23 Created: 2011-08-23 Last updated: 2011-09-01Bibliographically approved
In thesis
1. Male-female Coevolution in Bruchid seed beetles
Open this publication in new window or tab >>Male-female Coevolution in Bruchid seed beetles
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Male-female coevolution is at the heart of biology. It is responsible for much of the diversity we see in behaviour and morphology, and it is thought to be an important engine of speciation. The pattern of intersexual coevolution is well established in many taxa, yet understanding of the processes responsible for male-female coevolution remains incomplete. By studying interspecific variation within a closely related group of species, we can gain important information about how traits and behaviours have evolved. In the work done for this thesis, we studied a group of seed beetle species. Our results show that male-female coevolution has been a strong force in shaping both behaviour and morphological traits that are associated with mating and reproduction such as, morphology of male and female genitalia and remating behaviour. The evolution of harmful male genitalia has often been suggested to be a product of sexually antagonistic coevolution, but understanding of these extraordinary adaptations is limited. By combining comparative and experimental methods we show that as seed beetle males evolve more spiny genitalia, harm to females is elevated. We provide evidence for the correlated evolution between these antagonistic adaptations in males, and a female counter adaptation (the amount of connective tissue in the copulatory duct). We also demonstrate that imbalance of relative armament of the sexes affects evolution of the costs and benefits of reproduction. As males evolve genitalia that are more harmful relative to the level of female counteradaptation, costs associated with mating for females increase and population fitness is depressed. Our results unveil a coevolutionary arms race between the sexes and are consistent with a proposed link between sexual conflict, species’ viability and the risk of extinction.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 38 p.
, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 614
National Category
Biological Sciences
Research subject
Animal Ecology
urn:nbn:se:su:diva-61566 (URN)978-91-554-7444-7 (ISBN)
Public defence
Available from: 2011-08-31 Created: 2011-08-23 Last updated: 2011-08-31Bibliographically approved

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Liljestrand Rönn, Johanna
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