Evol Ecol Res 5: 1-18 (2003)     Full PDF if your library subscribes.

Assortative mating and plant phenology: evolutionary and practical consequences

Gordon A. Fox*

Department of Biology (SCA110) and Department of Environmental Science and Policy, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620, USA

e-mail: gfox@chuma1.cas.usf.edu


Variation in mating phenology causes assortative mating for phenological traits. Here I show that this assortative mating can be strong, as it is caused not only by periods of non-overlap in flowering, but also by variation in the composition of the mating pool during periods of overlap. Using a one-locus, two-allele model, I show that this temporal assortative mating can: (1) lead to declines in mean fitness under balancing selection, including fixation of one allele; (2) strongly affect the rate of response to directional selection; and (3) determine the boundaries of the basins of attraction under disruptive selection. These results suggest that the evolution of phenological traits – and traits functionally coupled with them – may be more complex than we have generally thought. They also suggest caution in interpreting the results of studies (e.g. quantitative genetic studies) that assume randomly mating populations.

Keywords: flowering, life-history evolution, population genetics, timing.

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