Abstract
We measured pollinator-mediated selection on quantitative floral traits through female reproductive success in a phenotypically variable population of Senecio integrifolius, consisting of plants derived from two natural populations, including genotypes with extreme trait values (head width) and plants on which all rays had been removed. In addition to significant heritabilities for all traits, we also documented genetic variation in phenotypic plasticity for head width. A phenotypic selection analysis demonstrated (1) a strong positive relationship between the percentage seed-set and the overall cross-fertility determined in a previous greenhouse study
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