A preliminary Report of Wild Bee Fauna on Mt. Usu

概要

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The bee fauna was surveyed on and around Mt. Usu in 1984, six years after the 1977-78 eruptions of this volcano which had caused faunal and vegetational damage especially around the mountaintop area. In total 46 species of 6 families were obtained, out of which Halictidae was most dominant as in other areas in Hokkaido. These species were grouped into four types from, their nest site preference and into four types from their flower preference. The distribution of the bees seemed to be notably influenced by the availability of their favorite nest sites, because the bare-ground nesters were predominant on the deforested mountaintop area and the stalk nesters and the forest nesters were dominant in the mountain foot area which did not suffer the serious vegetational damage. As for the flower preference, legume visitors prevailed in the grass lands of mountaintop area where Trifolium repens had artificially been sown soon after the eruption to protect the soil from erosion. For the distribution of bees, however, the richness of their favorite flowers was not so critical as that of their favorite nest sites, because the bare-ground nesters Halictidae were predominant in the deforested area where their favorite open flowers were poor.
北海道大学の論文
1986-08-20