Abstract
To assess the impact of Bombus terrestris invasion on the foraging efficiency of native Japanese bumblebees, consumption and acquisition of floral resources during foraging on flowers of native Japanese plant species were investigated using enclosures with three treatments: one with only B. terrestris (exotic), one with both B. terrestris and native Japanese bumblebee species (mixed), and one with only Japanese species (native), but with the bumblebee density held constant. Changes in the body mass of queens and the nest mass of colonies for two days did not significantly differ among four combinations of the species and treatment, B. terrestris in the exotic and mixed treatments and Japanese species in the mixed and native treatments. Thus, it is not clear that B. terrestris has higher foraging efficiency than native species and that B. terrestris individuals more negatively affect the foraging efficiency of native species than individuals of the native species themselves. The nectar standing crop of Cirsium kamtschaticum was smaller in the exotic treatment than in the mixed and native treatments. However, this may have been an artifact of differences in the numbers of flowers in the various treatments.
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Acknowledgements
The authors would first like to thank the 10 technical staff at Tomakomai Experimental Forest (TOEF) for making the bee keeping room and nest boxes, preparation of plants, and constructing the greenhouses. We also thank Mr M. Yoneda (API Co. Ltd.), Mr M. Mitsuhata (Arysta Lifescience Co.) and Ms S. Niwa for technical information on bee keeping, and API Co. Ltd. for providing bees, pollen and nest boxes. Eleven students in TOEF kindly helped with fixing nets on the greenhouses. Drs G. Kudo and H. Ishii kindly gave information on availability and reproduction of bumblebee-pollinated plants. Drs L. D. Harder and T. T. Makino are thanked for editorial assistance with the manuscript. This work was supported by Global Environmental Research Fund (director, K. G.), MESSC Grant-in Aid 15208014 and 16770020, and JSPS fellowship for young scientists to T. K.
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T. Nagamitsu and T. Kenta contributed equally to this work
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Nagamitsu, T., Kenta, T., Inari, N. et al. Foraging interactions between native and exotic bumblebees: enclosure experiments using native flowering plants. J Insect Conserv 11, 123–130 (2007). https://doi.org/10.1007/s10841-006-9025-x
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DOI: https://doi.org/10.1007/s10841-006-9025-x