Changes in Salinity, Sediment Condition and Macrobenthos Fauna after Removal of Enclosing Levee in Hirakata Cove, Yokohama

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  • KOSHIKAWA Yoshinori
    Department of Ocean Science, Tokyo University of Fisheries. present actress ; Hayama marine science laboratory, Kajima corporation
  • OHTSUKI Akira
    Department of Ocean science, Tokyo University of Fisheries
  • HAGIWARA Kiyoshi
    Hayama marine science laboratory, Kajima corporation)
  • SAKURAI Nobuo
    Hayama marine science laboratory, Kajima corporation)

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Other Title
  • 横浜平潟湾における遮水壁撤去による塩分，底質環境と底生生物相の変化
  • ヨコハマ ヒラカタワン ニ オケル シャスイヘキ テッキョ ニ ヨル エンブン テイシツ カンキョウ ト テイセイ セイブツソウ ノ ヘンカ

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Abstract

Changes in salinity and sediment conditions, and recovery of macro-benthic fauna were investigated at three sampling sites with different water quality conditions before and after removal of the levee. After the removal, salinity and apparent redox potential in surface sediment in the inner Hirakata Bay significantly increased from mean 22.8 to 25.5 and from -150 to +95 mV, respectively, resulting in aerobic condition. At the same time dominant species in macro-benthic fauna changed from polychaetes Neanthes japonica, Capitellidae spp. to Bivalvia including Ruditapes philippinarum. These results suggest that increased exchange rate of water mass due to removal of the levee can result in improved habitat conditions for macro-benthic fauna and the supplement of planktonic larvae of Ruditapes philippinarum from the outside bay.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 13 (3), 357-367, 2000

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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