Reduction of manganese dioxide in the sediment and its negative impact on the physiology of clams on two sandy tidal flats, Midori River Tidal Flat and Arao Tidal Flat, in Ariake Bay

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On Midori River Tidal Flat and Arao Tidal Flat, which are major sandy tidal flats in Ariake Bay, Kyushu, Japan, I examined various heavy metal contents of the surface sediment to reconfirm that, among the heavy metals, only manganese deposited on the sediment at extremely high levels. On these two tidal flats, 790 to 2,230 mg kg−1 dry sediment of total manganese was detected in the surface sediment. The manganese deposited (mainly as manganese dioxide) in the sediment tends to be reduced by bacterial activities, released as manganese ion to the interstitial water of the sediment, and weakly bound electronically in an exchangeable form with organic or inorganic matter in the sediment. I also examined the manganese ion concentration of the interstitial water and the content of the exchangeable form of manganese of the sediment. High concentrations of manganese ions, as affect the physiology of the aquatic organisms, were detected from the interstitial water of the sediment on Midori River Tidal Flat (5.8 to 9.9 mg L−1), while high contents of the exchangeable form of manganese (approximately 28 mg kg−1 dry sediment) were found from the sediment on Arao Tidal Flat. It seems probable that the manganese ions reduced from the manganese in the sediment acts as one of the major limiting factors on the occurrence of the clam on these two tidal flats.

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  • Plankton & benthos research  

    Plankton & benthos research 3(2), 64-71, 2008-05-01 

    日本プランクトン学会、日本ベントス学会

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各種コード

  • NII論文ID(NAID)
    10021072713
  • NII書誌ID(NCID)
    AA12130745
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    18808247
  • NDL 記事登録ID
    9529982
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z54-J424
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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