Marine Lower Trophic Processes and Origin of Particulate Organic Matter Inferred from the Biochemical Characteristics in Hypertrophic Bayment (Dokai-bay) at Summer

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  • Hamada Ken-ichiro
    Aqua Research Center, The University of Kitakyushu Graduate School of Environmental Science, Hokkaido University
  • Ueda Naoko
    Aqua Research Center, The University of Kitakyushu
  • Yamada Machiko
    Department of Environmental Science, Fukuoka Women's University
  • Tada Kuninao
    Departmentof Life Sciences, Kagawa University
  • Montani Shigeru
    Graduate School of Environmental Science, Hokkaido University

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Other Title
  • 夏季の過栄養内湾（洞海湾）における生化学的キャラクターから 見た粒子状物質の起源と低次生産過程
  • カキ ノ カエイヨウ ナイワン ドウカイワン ニ オケル セイカガクテキ キャラクター カラ ミタ リュウシジョウ ブッシツ ノ キゲン ト テイジ セイサン カテイ

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<p><tt>Chemical characteristics of particulate organic matter were investigated to elucidate influences of marine lower trophic processes on material cycling in hypertrophic bayment (Dokai Bay) in summer. Sinking particles were collected twice by setting up a sediment trap at three points in the bay in August of 1995 and 1996 when red tides occurred. Total settling mass flux varied from 8.2 to 307 g m-2 d-1, which was greater than that in other inner bays. Apparent increase in total mass flux was observed both from the mouth (Stn. 2, 20.1~62.5 gm-2 d-1) to the inner (Stn. 6, 41.8~307 g m-2 d-1) part of the bay and from 3 to 7 meters depth. In the inner part and middle part of the bay, biophile elements and biochemical composition ratios of sinking particles (1996; Stn. 2, 3m C : N: P=68: 10: 1, Stn. 4, 3m C : N: P=71 : 10: 1) were close to those of suspended particles (1996; C: N: P=57: 12: 1). It was found that the proportion of phytoplankton origin organic carbon flux and fecal carbon flux in total organic carbon flux incre邸edwith getting nearer to the mouth of the bay. Since C/N (11~20) of the sinking particles was higher than that of the suspended particles (4.6) and the Redfield ratio (6.6) in the inner part of the bay, it was thought that the origin of the particulate organic matter was the land. From these results, it was confirmed that material cycling and the origin of particulate organic matter in the bay differed in the locations; the origin in the inner part of the bay was the land and that in the mouth and middle part of the bay was produced by marine lower trophic p</tt><tt>rocesses. </tt></p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 17 (3), 179-191, 2008-05-01

    The Oceanographic Society of Japan

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