High reproductive ability of an alien bumblebee invader, Bombus terrestris L., in the Hidaka region of southern Hokkaido, Japan

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  • MATSUMURA Chizuru
    Institute of Agricultural and Life Sciences, University of Tokyo:Laboratory of Conservation Ecology, Department of Ecosystem Studies, Institute of Agricultural and Life Sciences, University of Tokyo
  • NAKAJIMA Maki
    Institute of Agricultural and Life Sciences, University of Tokyo
  • YOKOYAMA Jun
    Graduate School of Life Sciences, Tohoku University
  • WASHITANI Izumi
    Institute of Agricultural and Life Sciences, University of Tokyo

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Other Title
  • 北海道日高地方で発見されたセイヨウオオマルハナバチ(Bombus terrestris L.)の自然巣における高い増殖能力
  • 実践報告 北海道日高地方で発見されたセイヨウオオマルハナバチ(Bombus terrestris L.)の自然巣における高い増殖能力
  • ジッセン ホウコク ホッカイドウ ヒダカ チホウ デ ハッケン サレタ セイヨウオオマルハナバチ Bombus terrestris L ノ シゼン ソウ ニ オケル タカイ ゾウショク ノウリョク

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From June to September, 2003, we searched rural areas (7.75km^2) in Mukawa, Atsuma, and Monbetsu, in the Hidaka region of southern Hokkaido, for natural nests of alien (Bombus terrestris L.) and native Japanese bumblebee species. Twentyseven nests were found. Eight B. terrestris nests had been made in abandoned rodent nests underground. The number of individuals (i.e., eggs, larvae, cocoons, adults), and nest characteristics, such as food storage and the number of excretions, were recorded for nine of the 27 nests. The B. terrestris colonies contained a mean of 110 new queens; this mean is 4.4 times larger than the mean for native bumblebees. This strongly suggests that the reproductive ability of B. terrestris is higher than that of the native bumblebees in the region.

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