|| 要旨トップ | 目次 |||日本生態学会第61回全国大会 (2014年3月、広島) 講演要旨
一般講演（口頭発表） G0-08 (Oral presentation)
Floral color change has been considered as a plant strategy for increasing pollination efficiency, but it is unclear why this trait is hardly prevalent among angiosperms. Our preliminary surveys in a garden suggest that only color-changing species offer flower visitors with color cues to choose rewarding flowers, which benefits plants by attracting bees that return preferentially to more easily exploitable plants. Here, to examine whether the benefit applies in natural habitats, we compared pollinator fauna between Weigela decora (color changer) and W. hortensis (non-changer). We also marked flower visitors on focal plants and observed their returns for subsequent 3-5 days, from which we estimated their tendency to revisit particular plant individuals. Results show that color changers had a greater proportion of visits by bumble bees than non-changers. Tendency of each insect type to revisit the same plants did not vary between the plant species. On both plant species, bumble bees returned to focal plants more frequently than the other insect species. These results suggest that color changers are more dependent on pollinators that have strong persistence to revisit the same plants.