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Do floral herbivores respond to variation in flower characteristics in Gelsemium sempervirens (Loganiaceae), a distylous vine?¹

Department of Biology, P.O. Box 8042, Georgia Southern University, Statesboro, Georgia 30460 USA

We tested the hypothesis that traits traditionally thought to function in pollination can also influence attack by floral herbivores. Because distylous species produce two different flower types, we used Gelsemium sempervirens, a distylous vine of southeastern USA, to examine the frequency and pattern of floral herbivory in relation to floral characteristics. Flowers of the short-styled morph had larger corollas but showed no difference in the volume or concentration of nectar produced. Over the 2 yr of this study, 20–30% of plants suffered floral herbivory. The pattern of damage was morph-specific. Long-styled flowers were more likely to have damaged pistils, while stamens were more often damaged in short-styled flowers. In this distylous species, exserted flower organs were more likely to be eaten. Such differential herbivory based on the position of floral organs within a flower may result in reduced fitness via either male (short-styled morph) or female function (long-styled morph).

Key Words: distyly • floral herbivory • flower predation • flower size • Gelsemium sempervirens • heterostyly • nectar production

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