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Effects of nitrogen : phosphorus ratios on the interspecific competition of phytoplankton communities

Research Project

Project/Area Number 19510038
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental impact assessment/Environmental policy
Research InstitutionLake Biwa Environmental Research Institute

Principal Investigator

TSUJIMURA Shigeo  Lake Biwa Environmental Research Institute, 総合解析部門, 専門研究員 (60300969)

Project Period (FY) 2007 – 2010
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords生態系影響評価 / 湖沼生態 / 植物プランクトン / 環境 / 生物圏現象
Research Abstract

The limited ratio of nitrogen (N) to phosphorus (P) was investigated for some phytoplankton species and was compared with the N:P ratio of nutrient-sufficient cells. Since the intercellular phosphorus reserves are much more than those of nitrogen, the limited N:P ratio was much larger than the Redfield ratio which is used to infer the nutrient limitation. Therefore it is suggested that phytoplankton are affected by N limitation more than we have assumed it so far. There was a difference in the supply pattern of dissolved phosphorus and nitrogen in the South Basin of Lake Biwa, resulted in the fluctuation of the supply N:P ratio. This seems to be influenced the species composition and the dominance in phytoplankton.

Report

(6 results)
  • 2010 Annual Research Report   Final Research Report ( PDF )
  • 2009 Annual Research Report   Self-evaluation Report ( PDF )
  • 2008 Annual Research Report
  • 2007 Annual Research Report
  • Research Products

    (9 results)

All 2011 2009 2008 Other

All Journal Article (1 results) Presentation (3 results) Book (4 results) Remarks (1 results)

  • [Journal Article] 湖沼におけるラン藻の個体群動態解析に向けた取り組み2008

    • Author(s)
      辻村茂男
    • Journal Title

      日本プランクトン学会報 55

      Pages: 51-54

    • NAID

      10024786824

    • Related Report
      2010 Final Research Report 2009 Self-evaluation Report
  • [Presentation] Development of cyanoab acterial blooms with special referen ce to the role of overwintering popu lation.2009

    • Author(s)
      Tsujimura, S.
    • Organizer
      The 9^<th> International Phycolo gical Congress.
    • Place of Presentation
      国立オリンピック記念青少年総合センター・東京
    • Year and Date
      2009-08-03
    • Related Report
      2010 Final Research Report
  • [Presentation] Development of cyanoabacterial blooms with special reference to the role of overwintering population2009

    • Author(s)
      Shigeo Tsujimura
    • Organizer
      The 9^<th> International Phycological Congress
    • Place of Presentation
      国立オリンピック記念青少年総合センター(東京都)
    • Year and Date
      2009-08-03
    • Related Report
      2009 Annual Research Report
  • [Presentation] Development of cyanoabact er i al bl ooms with speci al reference to the role of over wintering popul ation2009

    • Author(s)
      Tsuji mura, S.
    • Organizer
      The 9^<th> International Phycological Congress
    • Related Report
      2009 Self-evaluation Report
  • [Book] Characteristics of phytoplankton flora and long-term changes in the phytoplankton community of Lake Biwa. Lake Biwa : Interactions Between Nature and People.(Kawanabe, H., Nishino, M., Maehata, M.eds)2011

    • Author(s)
      Tsujimura, S., Ichise, S.
    • Publisher
      Springer(in press)
    • Related Report
      2010 Annual Research Report
  • [Book] Occurrences of Uroglena red tides and cyanobcterial blooms in Lake Biwa. Lake Biwa : Interactions Between Nature and People.(Kawanabe, H., Nishino, M., Maehata, M.eds)2011

    • Author(s)
      Tsujimura, S., Ishikawa, K.
    • Publisher
      Springer(in press)
    • Related Report
      2010 Annual Research Report
  • [Book] Charact eristics of phytoplankton flora and long-term changes in the phytoplan kton community of Lake Biwa.

    • Author(s)
      Tsujimura, S., Ichise, S.
    • Publisher
      In Kawanabe, H., Nishino, M., Maehata, M. (eds) Lake Biwa : Interactions Between Nature and People.(in press)
    • Related Report
      2010 Final Research Report
  • [Book] Occurrences of Uroglena red tides and cy anobcterial blooms in Lake Biwa.

    • Author(s)
      Tsujimura, S., Ishikawa, K.
    • Publisher
      In Kawanabe, H., Nishino, M., Maehata, M. (eds) Lake Biwa : Interactions Between Nature and People. (in press)
    • Related Report
      2010 Final Research Report
  • [Remarks] ホームページ

    • URL

      http://www.lberi.jp/root/jp/bkjhindex.htm

    • Related Report
      2010 Final Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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