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Integrative and Comparative Biology Advance Access published online on May 5, 2006
Integrative and Comparative Biology, doi:10.1093/icb/icj038
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© The Author 2006. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please e-mail: journals.permissions@oxfordjournals.org.

Sexual Selection and Mating Systems in Hermaphrodites

Trait selection in flowering plants: how does sexual selection contribute?

Lynda F. Delph 1 * and Tia-Lynn Ashman 2
1 Department of Biology, 1001 East Third Street, Indiana University, Bloomington, IN 47405 USA
2 Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260 USA

* To whom correspondence should be addressed.
Lynda F. Delph, E-mail: ldelph{at}indiana.edu


  Abstract

Synopsis By highlighting and merging the frameworks of sexual selection envisioned by Arnold (1994) and Murphy (1998), we discuss how sexual selection can occur in plants even though individuals do not directly interact. We review studies on traits that influence pollen export and receipt in a variety of hermaphroditic and gynodioecious plants with the underlying premise that pollination dynamics influences mate acquisition. Most of the studies reviewed found that phenotypes that enhance pollen export are in harmony with those that enhance pollen receipt suggesting that in many cases pollinator visitation rates limit both male and female function. In contrast, fewer traits were under opposing selection; but when they were, the traits most often were associated with enhancing the specific aspects of a given sex function. Our review helps clarify and illustrate why sexual selection can be a component of trait evolution in hermaphrodite plants.

From the symposium "Sexual Selection and Mating Systems in Hermaphrodites" presented at the annual meeting of the Society for Integrative and Comparative Biology, January 4-8, 2005, at San Diego, California.
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