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The Effects of Competition for Pollination on Floral Evolution of Gynodioecious Lobelia siphilitica

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dc.contributor.advisor Caruso, Christina Wassink, Erica Dawn 2012-01-06T20:57:42Z 2012-01-06T20:57:42Z 2012-01 2011-12-13 2012-01-06
dc.description.abstract Co-occurring species of flowering plants may compete for pollination, which can cause character displacement by altering natural selection on floral traits. In a gynodioecious species, competition for pollination may also affect the evolution of sexual dimorphism of floral traits by influencing sex-specific selection. I demonstrated that Mimulus ringens did not affect seed set of gynodioecious Lobelia siphilitica, indicating that it is not a competitor for pollination. The presence of M. ringens did not alter selection upon most floral traits of L. siphilitica. I detected sex-specific selection upon five floral traits, supporting the hypothesis that sexual dimorphism evolves in response to sex-specific selection, rather than pleiotropic effects. My results also suggest that the presence of a co-flowering species may provide a context for sex-specific selection, and therefore, influence sexual dimorphism. Thus, my results suggest a link between the fields of study of competition for pollination and the evolution of sexual dimorphism. en_US
dc.description.sponsorship NSERC, OGS, Ontario Innovation Trust, Canada Fund for Innovation en_US
dc.language.iso en en_US
dc.subject phenotypic selection en_US
dc.subject competition for pollination en_US
dc.subject sex-specific selection en_US
dc.subject sexual dimorphism en_US
dc.subject lobelia siphilitica en_US
dc.subject gynodioecy en_US
dc.title The Effects of Competition for Pollination on Floral Evolution of Gynodioecious Lobelia siphilitica en_US
dc.type Thesis en_US Integrative Biology en_US Master of Science en_US Department of Integrative Biology en_US
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