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Effects of ultraviolet radiation on Production and degradation of dissolved organic matter in the sea

Research Project

Project/Area Number 12660181
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionSoka University

Principal Investigator

TAGUCHI Satoru  Soka University, Engineering, Professor, 工学部, 教授 (40277877)

Co-Investigator(Kenkyū-buntansha) OGAWA Hiroshi  University of Tokyo, ORI, Associate Professor, 海洋研究所, 助教授 (50260518)
KOIDE Isao  University of Tokyo, ORI, Professor, 海洋研究所, 教授 (30107453)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsDOM / CDOM / PAR / UVR / diatoms / bacteria / UVB / 光分解 / 植物プランクトン
Research Abstract

Natural and artificial seawater were evaluated to study on Chromophotic Dissolved Organic Matter (CDOM) as an index of Dissolved Organic Matter (DOM). Filter types were also compared to obtain particle-free filtered seawater. Cultural phytoplankton grew better in the filtered natural seawater. Anodisc filters eliminated most particles from seawater. Several phytoplankton group were examined and diatoms grew as well as bacteria and CDOM increased even in the filtered seawater. Under a dark condition, both diatoms and bacteria did not grow. But not bacteria grew in the Anodisc filter seawater and consequently no production of CDOM occurred. Those series of experiment may suggest that phytoplankton produce CDOM and bacteria utilize those CDOM. Under Ultraviolet Radiation (UVR) in addition to PAR, the growth rate of diatoms was depressed compared to PAR only. However the amounts of CDOM per cell were higher with UVR than one without UVR. In summary CDOM can be effectively employed to study dynamics of DOM, the present incubation methods can be applied to evaluate the ecological role of DOM in the ocean.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 今井亜紀 他4名: "海洋における細菌係数法の比較"Actina. 14. 31-36 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogawa, H., E.Tanoue: "Dissolved organic matter in oceanic waters"Journal of Oceanography. 59. 129-147 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogawa, H., 他2名: "Distribution of dissolved organic carbon in the East China Sea"Deep-Sea Research II. 50. 353-366 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Imai.A., A.Ahibata., T.Kikuchi., T.Toda., and S.Taguchi.: "Comparison of two epifluorescence counting methods of bacteria in the ocean -4'6-diamino-2-pheny1indole (DAPI) versus SYBR Green I method"Actina. 14. 31-36 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogawa,H., and E.Tanoue.: "Dissolved organic matter in ocean waters"Journal of Oceanography. 59. 129-147 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogawa,H., T.Usui., and I.Koike.: "Distribution of dissolved organic carbon in the East China Sea"Deep-Sea ResearchII. 50. 353-366 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 今井 亜紀, 他4名: "海洋における細菌計数法の比較"Actina. 14. 31-36 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ogawa, H., E.Tanoue: "Dissolved organic matter in oceanic waters"Journal of Oceanography. 59. 129-147 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ogawa, H.: "Distribution of dissolved organic carbon in the East China Sea"Deep-Sea Research II. 50. 353-366 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] V.S.Kuwahara: "Variability of Bio-optical Factors Influencing the Seasonal ・・・・"Photochemistry and Photobiology. 72(2). 193-199 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 戸田 龍樹: "相模湾・真鶴湾における海洋環境の周年ならびに経年変化-1995〜1999-"Actinia. 13. 31-41 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小川 浩史: "難分解性溶存有機物"月刊海洋、現代海洋化学. II. 204-209 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kuwahara,H.Ogawa……& S.Taguchi: "Seasonal role of dissolved organic material in the attenuation of solar ultraviolet radiation in temperate coastal waters"Photobiology and Photochemtistry. 72. 193-199 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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