Relationship between the distribution of an endangered cherry species, <i>Cerasus tamaclivorum</i>, and Tama New Town development on the Tama Hills, Tokyo, Japan

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  • Iki Masateru
    Department of Tourism Science, Graduate Schools of Urban Environmental Sciences, Tokyo Metropolitan University
  • Numata Shinya
    Department of Tourism Science, Graduate Schools of Urban Environmental Sciences, Tokyo Metropolitan University
  • Hosaka Tetsurō
    Department of Tourism Science, Graduate Schools of Urban Environmental Sciences, Tokyo Metropolitan University

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  • 多摩丘陵に生育する絶滅危惧種タマノホシザクラの分布と多摩ニュータウン開発との関連性
  • タマ キュウリョウ ニ セイイク スル ゼツメツ キグシュ タマノホシザクラ ノ ブンプ ト タマ ニュータウン カイハツ ト ノ カンレンセイ

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We examined the relationships between the distribution of an endangered cherry species, Cerasus tamaclivorum, and Tama new-town (NT) development on the Tama Hills. In total, 177 individuals were found in 27 sites in Hachioji city, Machida city and Tama city. Of these, 81.9% were found in urban parks and urban green areas in the NT area, and 17.5% were found in an area secondary forest (Kataso-yato), surrounding NT. In NT, all of these habitats had been developed by the Tokyo Metropolitan government, but their management was transferred to the current owners including city government. Our tree-ring analysis suggests that large individuals of the species were seedlings or saplings when the development of NT started in 1980's. We also found that the managers have recognized some individuals as "Yamazakura" (Cerasus jamasakura (Siebold ex Koidz.) H.Ohba). This circumstance, confirmed by documents on NT development by the Tokyo Metropolitan government suggests that the secondary forests like Kataso-yato might be an original habitat and sources of the transplanted saplings to NT area. Therefore, Kataso-yato remains the original habitat of C. tamaclivorum, and planting of this species by the Tokyo Metropolitan government during NT development can be considered as the main factor cause of the present distribution. However, we also found that some populations of the species went extinct in a decade. Nevertheless, the population of sproutings has increased as a result of restarting the secondary forest management by volunteers in Kataso-yato. Appropriate management of secondary forest, such as by periodic logging and mowing, is important for the conservation and sustainable use of C. tamaclivorum.

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