INVASION OF THE INTRODUCED DANDELIONS AND SURVIVAL OF THE NATIVE ONES IN THE TOKYO METROPOLITAN AREA OF JAPAN

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  • OGAWA Kiyoshi
    Department of Agronomy, Faculty of Education, Tokyo Gakugei University
  • MOTOTANI Isao
    Laboratory of Biology, Faculty of General Education, Tokyo University of Agriculture and Technology

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Other Title
  • 東京圏における外来種タンポポの侵入と在来種タンポポの残存
  • 東京圏における外来種タンポポの侵入と在来種タンポポの残存〔英文〕
  • トウキョウケン ニ オケル ガイライシュ タンポポ ノ シンニュウ ト ザイラ

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The distributions of the introduced and native dandelions were surveyed in the Tokyo metropolitan area of Japan. In the centre of the Tokyo metropolitan area, the introduced dandelions had superiority in abundance to the native ones, being frequently distributed without the native ones, though the relative population sizes were small. In the outskirts of Tokyo, the native dandelions were not always inferior in abundance to the introduced ones and were distributed widely, though the relative population sizes were not large. Urbanization seemed to have two effects on the dandelions, one was to destroy the populations of the native dandelions, and the other was to reduce the population sizes of the introduced ones. The hypothesis that the introduced dandelions expelled the native ones through direct competition was discussed critically, and the importance of land use as a means to allow dandelions to settle and maintain their populations was discussed.

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