カブトガニ産卵地の地形特性と孵化幼生の分散観測 : 希少生物生息地のミティゲーション計画のために Field observation of geomorphological features of the spawning site and dispersion of hatchlings of the horseshoe crab Tachypleus tridentatus : towards mitigation planning for the rare species

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Geomorphological features of the spawning sites of the horseshoe crab Tachypleus tridentatus were investigated in two river mouths in Moriye Bay in Oita Prefecture, one of the well-known habitats of the horseshoe crab in Japan. Its spawning sites were found at the inner sand bar of the river bend near the mouth, at the river mouth bar, and at a sandy beach surrounded by a tidal flat. The elevation and the median diameter of bed materials at the spawning sites were 0.62±0.18m (mean±SD) above the M.S.L. and ranged between 0.4 mm and 1.0mm, respectively. Dispersion patterns of the hatchlings were estimated by a float tracking experiment in the field. The result indicated that the hatchlings, which came out of the sand surface during high tide, could reach the larval habitat at the tidal flat by tidal currents in spite of their poor swimming ability. Mitigation methods necessary for construction of artificial spawning sites are proposed based on these field observations.

収録刊行物

  • 応用生態工学 = Ecology and civil engineering  

    応用生態工学 = Ecology and civil engineering 3(1), 7-19, 2000-07-21 

    Ecology and Civil Engineering Society

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各種コード

  • NII論文ID(NAID)
    10021976184
  • NII書誌ID(NCID)
    AA11528360
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • 雑誌種別
    大学紀要
  • ISSN
    13443755
  • NDL 記事登録ID
    5473327
  • NDL 雑誌分類
    ZN1(科学技術--建設工学・建設業) // ZR1(科学技術--生物学)
  • NDL 請求記号
    Z74-B482
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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