安定同位体^<15>Nを用いたモデル実験による浜名湖における垂直護岸と砂浜域の窒素フローの比較 A microcosm experiment comparing nitrogen flow near a seawall and along the sandy seashore per se in Hamana Bay, Japan, using ^<15>N

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著者

    • 植松 周平 UEMATSU Shuhei
    • 東京大学大学院農学生命科学研究科 Graduate School of Agricultural and Life Sciences, The University of Tokyo
    • 青木 茂 AOKI Shigeru
    • 東京大学大学院農学生命科学研究科 Graduate School of Agricultural and Life Sciences, The University of Tokyo
    • 岡本 研 [他] OKAMOTO Ken
    • 東京大学大学院農学生命科学研究科 Graduate School of Agricultural and Life Sciences, The University of Tokyo
    • 日野 明徳 HINO Akinori
    • 東京大学大学院農学生命科学研究科 Graduate School of Agricultural and Life Sciences, The University of Tokyo

抄録

A flow-through microcosm experiment was conducted using filter-feedering bivalves and ascideans together with intact sediment cores collected from near a seawall and from the natural sandy seashore and an artificial sandy tidal flat in Hamana Bay. The objective of this experiment was to examine individual specimens' ability to remove particulate organic matter and release nitrogen occurring in the different environments of the seawall and the shore. In consideration of apparent seasonal changes observed in Hamana Bay, summer- and fall- based models were used. <i>Mytilus galloprovincialis</i> (summer seawall model), <i>Molgula manhattensis</i> (fall seawall model), and <i>Ruditapes philippinarum</i> (summer and fall seashore models) served as the filter feeders in the experiments, and <sup>15</sup>N-labeled <i>Chaetoceros calcitrans</i> was used as the nitrogen source. In both the seawall and seashore models, 30% of PON was decomposed into NH<sub>4</sub><sup>+</sup> in the fall, while only a few percent was decomposed in the seawall model in summer due to inactivation of the macrobenthic metabolism by hypoxia. In the latter model, <i>Mytilus galloprovincialis</i> and the sediment both acted as sinks to accumulate most of the nitrogen, thus causing a de-acceleration in the nitrogen cycling rate and, consequently, summer eutrophication. In contrast the nitrogen cycling rate of the seawall model in fall was as high as that of the seashore model. These results suggest that the sandy seashore and tidal flat region may be playing a significant role in eutrophication improvement in Hamana Bay.

収録刊行物

  • Sessile organisms  

    Sessile organisms 25(1), 37-46, 2008-02-29 

    日本付着生物学会

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各種コード

  • NII論文ID(NAID)
    10021215935
  • NII書誌ID(NCID)
    AN10563630
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13424181
  • NDL 記事登録ID
    9434788
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z18-1319
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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