Abstract
Premise of research. Selfing rates in mixed-mating plant species are often found to fluctuate greatly across time and space. Environmentally induced changes in floral traits may mediate changes in selfing rates through several mechanisms, including direct effects via changes in traits influencing autofertility rates and indirect effects via changes in traits affecting the rate of pollinator visitation and/or the efficiency of cross-pollination. In this study, we tested how experimentally induced drought affected traits related to these three components of plant mating systems.Methodology. We subjected two populations from each of two species in the Dalechampia scandens species complex to a series of experimental drought events in the greenhouse. We measured drought effects on advertisement (signaling) traits, reward traits, herkogamy, dichogamy, autofertility, and pollination accuracy and compared these across populations and species.Pivotal results. Blossom size (advertisement and reward traits) and dich...
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