諫早湾潮止め後の有明海における二枚貝群集の変化 Faunal Change of Bivalves in Ariake Bay after the Construction of a Dike for the Reclamation of Isahaya Bay, Western Kyushu, Japan

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The inner part of Isahaya Bay was isolated from the rest of Ariake Bay by a reclamation dike in April, 1997. Thereafter, several changes in environmental conditions, such as a drastic increase in red tides and hypoxic water, were observed in Ariake Bay. We periodically monitored the number of species and mean densities of bivalves in two regions: (1) 20 fixed stations around the mouth of Isahaya Bay from June, 1997, to November, 2003; and (2) 24 fixed stations around the mouth of the Mizunashi River, Shimabara, located about 20 km south of the mouth of Isahaya Bay, from November, 1995, to December, 2001. In June, 1997, hypoxic water masses appeared in both the Isahaya and Shimabara regions, and most of the bivalve species distributed near the hypoxic regions decreased rapidly from 1997 to 1999. The number of species and mean density of bivalves reached a minimum in June, 2000, in the Isahaya region and in December, 1999, in the Shimabara region. Thereafter, since 2000, these values have been increasing in both regions. In the Shimabara region, most of the species dominant before 1999 recovered by December, 2001. In the Isahaya region, however, hypoxic water also recurred in June of both 1999 and 2001; there, only a few bivalve species increased rapidly at first and then subsequently decreased in abundance until November, 2003. In conclusion, if there is no amelioration of the environmental changes that have been occurring in Ariake Bay since 1997, we predict that a few opportunistic species of bivalve will continue to increase rapidly while other species disappear completely from the Isahaya region.

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 60, 30-42, 2005-07-28 

    JAPANESE ASSOCIATION OF BENTHOLOGY

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各種コード

  • NII論文ID(NAID)
    10018282600
  • NII書誌ID(NCID)
    AA11376003
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1345112X
  • NDL 記事登録ID
    7793034
  • 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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