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

The Atrium, University of Guelph Institutional Repository

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

Show full item record

Title: The Effects of Competition for Pollination on Floral Evolution of Gynodioecious Lobelia siphilitica
Author: Wassink, Erica Dawn
Department: Department of Integrative Biology
Program: Integrative Biology
Advisor: Caruso, Christina
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.
URI: http://hdl.handle.net/10214/3245
Date: 2012-01-06


Files in this item

Files Size Format View
E Wassink Thesis.pdf 2.178Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record

Search the Atrium


Advanced Search

Browse

My Account