Abstract
Knowing how floral visitors forage efficiently among flowers is important to understanding plant-pollinator interactions. When bees search for rewarding flowers, they use several visual cues to detect the available floral resources. In addition to these cues, bees can recognize scent marks, which are olfactory cues left on flowers foraged by previous visitors. This behavior is well known in social bees, such as honeybees and bumblebees. Although solitary bees do not need to give information about which flowers were foraged to conspecifics, several pieces of evidence have indicated the use of scent marks. However, it is unknown whether the behavior is widely used in many different bee species. We investigated whether four different solitary bees, Colletes patellatus (Colletidae), Andrena prostomias (Andrenidae), Osmia orientalis (Megachilidae), and Tetralonia mitsukurii (Apidae), can recognize flowers that have been foraged previously by visitors within 3 min. All four bees showed rejection responses to flowers foraged by conspecifics. However, our results showed that responses to foraged flowers varied among bee species. The tendency of A. prostomias and T. mitsukurii to reject the foraged flowers was pronounced, while in C. patellatus and O. orientalis it was weak. In both A. prostomias and T. mitsukurii, the rejection rate of flowers foraged by conspecifics decreased as the time lag after the last visit increased. Both bees visited the flowers from which pollen or nectar had been artificially removed. We suggest that A. prostomias and T. mitsukurii would recognize scent marks left by previous visitors, while the other two bees would not recognize them so strongly. It is likely that the decision to use scent marks is dependent either on the richness of resources or on the complexity of floral structure.
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Acknowledgments
We are grateful to Dave Goulson, School of Biological and Environmental Science, University of Stirling, and Pablo J. Perez-Goodwyn, Laboratory of Insect Ecology, Kyoto University, for careful proofreading of the manuscript. We thank Takayoshi Nishida and members of the Laboratory of Insect Ecology, Kyoto University, for helpful comments on an early draft of the manuscript. We are also grateful to Tsuyoshi Sugimoto, Yasuyuki Sakuratani, and Ikuo Kandori, Laboratory of Entomology, Kinki University, for valuable advice and permission to use the university campus. This work was supported in part by the Twenty-First Century COE Program for Innovative Food and Environmental Studies Pioneered by Entomomimetic Sciences from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
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Yokoi, T., Fujisaki, K. Recognition of scent marks in solitary bees to avoid previously visited flowers. Ecol Res 24, 803–809 (2009). https://doi.org/10.1007/s11284-008-0551-8
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DOI: https://doi.org/10.1007/s11284-008-0551-8