Differences in Pollen Resource Usage and Foraging Periods between the ExoticBumblebee Bombus terrestris and the Native B. pseudobaicalensisand B. hypocrita sapporoensis in Hokkaido, Japan
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概要
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Bombus terrestris Linnaeus is an exotic bumblebee species that has recently been naturalized inHokkaido, Japan. Some studies have suggested that the naturalization of this species has caused adecline in the native bumblebee populations. The present study focuses on differences in plant resourceusage between coexisting exotic (B. terrestris) and native (B. pseudobaicalensis and B. hypocritasubsp. sapporoensis) bumblebee species in the Ishikari lowland region of Hokkaido. We observed theworkers of the three species that came to forage in the investigation area during an approximatelyfive-month period. In addition, we captured some of the bees carrying pollen to analyze the pollengrains attached to their body surfaces. The pollen grains were identified at the genus or species level.Compared with the two native species, B. terrestris workers were relatively abundant during theinvestigation period. This species also exhibited a relatively long duration of foraging activity and alarger foraging range than the other two native species. The patterns of pollen resource usage weregenerally different among the three species, suggesting that these species have different flowerpreferences. Cluster analysis based on use of pollen species by each worker revealed that the clustercompositions overlapped among the three species in July, but this overlap disappeared in August. Theusage in pollen species tended to differ through the season.
- Hokkaido University Forests, EFRCの論文
Hokkaido University Forests, EFRC | 論文
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