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Evidence of monandry in a mosquito (Sabethes cyaneus) with elaborate ornaments in both sexes
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.
2008 (English)In: Journal of insect behavior, ISSN 0892-7553, E-ISSN 1572-8889, Vol. 21, no 6, 451-459 p.Article in journal (Refereed) Published
Abstract [en]

Despite the benefits of multiple mating to females many mosquitoes appear to be monandrous. Members of the mosquito tribe Sabethini are unique among the mosquitoes for they possess iridescent scales and elaborate ornaments in both sexes. Additionally, this tribe boasts the only reported cases of courtship display within the mosquitoes. Due to these singular traits and behaviors, we predicted that members of this tribe have a different mating system with relatively high female mating rate. We tested this prediction in the ornamented mosquito Sabethes cyaneus. Contrary to our prediction, however, females were monandrous throughout their lifetime and multiple gonotrophic cycles. We discuss the possible implications of monandry on the evolution of sexually homologous ornaments, with particular consideration of mutual mate choice.

Place, publisher, year, edition, pages
2008. Vol. 21, no 6, 451-459 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-107854DOI: 10.1007/s10905-008-9137-0ISI: 000259733300001OAI: oai:DiVA.org:uu-107854DiVA: diva2:233336
Available from: 2009-08-31 Created: 2009-08-31 Last updated: 2017-12-13Bibliographically approved
In thesis
1. The Evolution of Sexually Homologous Ornaments: Selection via Male Mate Choice Coinciding with Male-Male Competition in a Neotropical Mosquito
Open this publication in new window or tab >>The Evolution of Sexually Homologous Ornaments: Selection via Male Mate Choice Coinciding with Male-Male Competition in a Neotropical Mosquito
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The evolution of elaborate male ornaments via sexual selection is well-understood while the selective pressures acting on female ornaments remains unresolved. Female ornaments in species with strong sexual selection on the male homologue of the ornament were originally thought to result from an intersexual genetic correlation. My thesis explores the evolution of ornaments in females due to direct selection by developing theoretical models and examining the biology of a neotropical mosquito (Sabethes cyaneus) with sexually homologous ornaments coinciding with male-male competition.

I began by exploring the morphology of the ornaments in both sexes of S. cyaneus. Sexual dimorphism in the size and shape of the ornaments was slight and both male and female ornaments showed classic hallmarks of sexually selected traits. I then tested for direct selection on S. cyaneus male and female ornaments via mutual mate choice. I found evidence of male, but surprisingly not female, preferences for ornaments.

I then further considered the evolution of male mate choice in polygynous species. First, I investigated whether male investment in courtship by S. cyaneus may result in a lower operational sex ratio and thereby reduce the costs associated with male mate choice. Male courtship did pose a significant longevity cost to male S. cyaneus. Second, I explored the possibility that a female preference for male courtship effort may contribute to the benefits of male mate choice in a series of population genetic models. The spread of a male preference gene can be driven by female preferences for male courtship when males court preferred females more.

Finally, I found that female S. cyaneus are not benefitting from signalling to increase their mating rate as they are monandrous. My thesis therefore challenges standing sexual selection theory and suggests that sexual selection on females may be more widespread than previously thought.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 799
Keyword
sexual selection, Sabethes cyaneus, Diptera, Culicidae, mosquito, mutual ornamentation, sexual selection, mutual mate choice, male mate choice, female ornament, ecology, animal behaviour
National Category
Ecology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:uu:diva-141936 (URN)978-91-554-7985-5 (ISBN)
Public defence
2011-02-25, Zootissalen, EBC, Villavägen 9, Uppsala, 09:30 (English)
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Supervisors
Note
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 729Available from: 2011-02-03 Created: 2011-01-12 Last updated: 2011-03-21Bibliographically approved

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South, Sandra H.Arnqvist, Göran

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