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Morphological variation of an ornament expressed in both sexes of the mosquito Sabethes cyaneus
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
2009 (English)In: Evolutionary Ecology Research, ISSN 1522-0613, E-ISSN 1937-3791, Vol. 11, no 1, p. 1-21Article, review/survey (Refereed) Published
Abstract [en]

Question: Do elaborate ornaments expressed in both sexes show patterns of phenotypic variation consistent with selection via mutual mate choice? Data description: Detailed morphometric data on the striking leg 'paddle' ornament of the sabethine mosquito Sabethes cyaneus: ornament size and shape and size of general morphological traits. Data derive from 80 males and 80 females from a wild-type laboratory colony established with individuals collected in Panama. Search method: Shape variation was analysed using geometric morphometric methods (elliptic Fourier analyses). We investigated sex differences in the relationships between body size on the one hand and leg length, ornament size, and ornament shape on the other, using general linear models. We also explored morphological variation in asymmetry, allometry, and in the magnitude of phenotypic variation across traits. Conclusions: These ornaments showed many of the classic hallmarks of a sexually selected and condition-dependent ornament: (i) phenotypic variation in size was much greater than for any other trait; (ii) the size of the major part of the paddle showed positive allometry; and (iii) the degree of fluctuating asymmetry in one component of the shape of the leg paddles decreased with body size. Remarkably, these patterns were more pronounced in females and sexual dimorphism in size and shape of the leg paddle ornament was slight. Although data on the current pattern of morphological variation alone does not allow firm conclusions about past selection, our results are consistent with the maintenance of these ornaments in both sexes by sexual selection via mutual mate choice.

Place, publisher, year, edition, pages
2009. Vol. 11, no 1, p. 1-21
Keywords [en]
allometry, Diptera, elliptic Fourier analysis, sexual selection, signal, variation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-135151ISI: 000263624900001OAI: oai:DiVA.org:uu-135151DiVA, id: diva2:374509
Available from: 2010-12-06 Created: 2010-12-05 Last updated: 2017-12-12Bibliographically 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. p. 52
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 799
Keywords
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)
Opponent
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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