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Oecologia

, Volume 154, Issue 1, pp 119–128 | Cite as

A test of the effect of floral color change on pollination effectiveness using artificial inflorescences visited by bumblebees

  • Gaku KudoEmail author
  • Hiroshi S. Ishii
  • Yuimi Hirabayashi
  • Takashi Y. Ida
Plant Animal Interactions

Abstract

Floral color change has been recognized as a pollination strategy, but its relative effectiveness has been evaluated insufficiently with respect to other floral traits. In this study, effects of floral color change on the visitation pattern of bumblebees were empirically assessed using artificial flowers. Four inflorescence types were postulated as strategies of flowering behavior: type 1 has no retention of old flowers, resulting in a small display size; type 2 retains old flowers without nectar production; type 3 retains old flowers with nectar; and type 4 retains color-changed old flowers without nectar. Effects of these treatments varied depending on both the total display size (single versus multiple inflorescences) and the pattern of flower-opening. In the single inflorescence experiment, a large floral display due to the retention of old flowers (types 2–4) enhanced pollinator attraction, and the number of flower visits per stay decreased with color change (type 4), suggesting a decrease in geitonogamous pollination. Type-4 plants also reduced the foraging time of bees in comparison with type-2 plants. In the multiple inflorescence experiment, the retention of old flowers did not contribute to pollinator attraction. When flowering occurred sequentially within inflorescences, type-4 plants successfully decreased the number of visits and the foraging time in comparison with type-2 plants. In contrast, floral color change did not influence the number of visits, and it extended the foraging time when flowering occurred simultaneously within inflorescences but the opening of inflorescences progressed sequentially within a plant. Therefore, the effectiveness of floral color change is highly susceptible to the display size and flowering pattern within plants, and this may limit the versatility of the color change strategy in nature.

Keywords

Display size Foraging behavior Geitonogamy Pollination efficiency Pollinator attraction 

Notes

Acknowledgments

We thank Adrian G. Dyer for his valuable suggestions about the manuscript and his help in reporting color properties, Marie Herberstein for her help in the measurements of the spectral reflectance of artificial flowers, and anonymous reviewers for their comments on the manuscript. This study was supported by grants-in-aid for scientific research (Nos. 15370006 and 16370007) from the Ministry of Education, Science, Sport and Culture of Japan.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Gaku Kudo
    • 1
    Email author
  • Hiroshi S. Ishii
    • 1
    • 2
  • Yuimi Hirabayashi
    • 1
    • 3
  • Takashi Y. Ida
    • 1
  1. 1.Graduate School of Environmental Earth ScienceHokkaido UniversitySapporoJapan
  2. 2.Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
  3. 3.Obihiro Centennial MuseumHokkaidoJapan

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