東京湾における移入種イッカククモガニとチチュウカイミドリガニの生活史と有機汚濁による季節的貧酸素環境での適応性 Life Histories of Introduced Crabs, the Majid Pyromaia tuberculata and the Portunid Carcinus aestuarii, in Tokyo Bay and Their Adaptability to Seasonal Hypoxia Caused by Organic Pollution

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Two introduced crab species, Pyromaia tuberculata and Carcinus aestuarii, occur abundantly in organically polluted waters in Japan. Population studies of these crabs have been conducted in Tokyo Bay, in which summer hypoxia causes destruction of the benthic animal populations on the bottom of the innerhalf of the bay. In fall, a population of P. tuberculata quickly recolonizes that bottom, which has recovered from the hypoxia, by settlement of larvae. Settled crabs reach maturity by the next spring, then release larvae until the subsequent summer hypoxia. Released larvae disperse to the outerhalf of the bay, resulting in recruitment of juveniles into the local population. These recruits reach maturity before the fall under the normoxic conditions prevailing there, then release larvae for recolonization of the innerhalf of the bay. Carcinus aestuarii grows along the shores of river-mouths and in a lagoon of the inner bay, but migrates out onto the bay bottom during fall to spring, when it releases larvae. Released larvae settle along the shores during the spring. Settled crabs grow on the shores with adult crabs that had returned from the bay bottom. Thus the crabs on the shores avoid encountering the bottom hypoxia. These results suggest that the main factor that has allowed the establishment of the new introduced populations in Tokyo Bay is complementarity between the life cycle of these crabs, including adult migration or larval dispersal, and the seasonal availability of a habitat that is recovering from hypoxia.

収録刊行物

  • 日本ベントス学会誌 = Japanese journal of benthology

    日本ベントス学会誌 = Japanese journal of benthology 59, 96-104, 2004-07-28

    JAPANESE ASSOCIATION OF BENTHOLOGY

参考文献:  27件中 1-27件 を表示

被引用文献:  3件中 1-3件 を表示

各種コード

  • NII論文ID(NAID)
    10016212763
  • NII書誌ID(NCID)
    AA11376003
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    1345112X
  • NDL 記事登録ID
    7073688
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z74-B668
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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