海域開発に伴う沿岸域生物群集の変化 : 韓国セマングム海域における大規模干拓堤防建設に伴う底生生物群集の変化に関する事例研究 Human Impacts on Coastal Communities : A Case Study of Benthic Faunal Changes after Dike Construction in Saemangeum, South Korea

Access this Article

Search this Article

Author(s)

Abstract

大規模干拓事業は,世界中の沿岸域の自然環境に大きな影響をもたらしている.本研究では,韓国西海岸のセマングム海域と日本の諫早湾において,干拓堤防建設に伴う底生生物相の変化を調査・比較した.セマングム海域では,2006年4月に世界最大の干拓堤防が完成した後は,干潟が徐々に乾燥を始めており,2006年6月には多くの貝類や他の底生生物の遺骸が出現した.諫早湾では,1997年4月に干拓堤防が完成し,有明湾からの海水流入が遮断された.ここでも,潮止め後数ヵ月で潮間帯が完全に乾燥し,無数の貝類遺骸が乾燥した泥干潟に出現した.底生生物相の変化は,諫早湾の堤防外側でも確認された.赤潮や貧酸素水塊が頻発し,多くの二枚貝類が1997年以降に急激に減少した.同様の変化は,セマングム干拓堤防外側でもすでに確認されている.これらの結果は,セマングム干拓事業が近い将来,黄海の環境に悪影響を及ぼすことを示唆している.

Major reclamation projects have resulted in large impacts on the natural environment of coastal areas worldwide. We investigated faunal changes in benthos following the construction of reclamation dikes in the area of Saemangeum, on the western coast of South Korea, and compared them with those in Isahaya Bay, Japan. The world's largest reclamation dike was constructed in Saemangeum. Following its completion in April 2006, the tidal flats in this area gradually dried out, and we confirmed that numerous dead shells of mollusks and other benthic animals were exposed on the dried tidal flat in June 2006. The inner part of Isahaya Bay was isolated from the rest of Ariake Bay by a reclamation dike in April 1997. The intertidal zone of this bay also dried out completely within several months, and numerous dead shells were exposed on the dried mud flats. Changes in benthic fauna were also confirmed in the outer part of Isahaya Bay. Red tides and hypoxic water have frequently been observed, and the numbers of many bivalve species have decreased rapidly since 1997. Similar changes have already been confirmed in the outer parts of the Saemangeum dike. These facts suggest that the Saemangeum dike will negatively affect the Yellow Sea in the near future.

Journal

  • The Quaternary Research (Daiyonki-Kenkyu)

    The Quaternary Research (Daiyonki-Kenkyu) 46(3), 265-274, 2007-06-01

    Japan Association for Quaternary Research

References:  22

Cited by:  3

Codes

  • NII Article ID (NAID)
    10023993273
  • NII NACSIS-CAT ID (NCID)
    AN0034136X
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    04182642
  • NDL Article ID
    8878213
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-67
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
Page Top