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

• Project/Area Number: 19510038
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental impact assessment/Environmental policy
• Research Institution: Lake 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: ¥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.

Research Products

• [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
• [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
• [Presentation] Development of cyanoabacterial blooms with special reference to the role of overwintering population (2009)
  • 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
• [Presentation] Development of cyanoabact er i al bl ooms with speci al reference to the role of over wintering popul ation (2009)
  • Author(s): Tsuji mura, S.
  • Organizer: The 9^<th> International Phycological Congress
• [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)
• [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)
• [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)
• [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)
• [Remarks] ホームページ
  • URL: http://www.lberi.jp/root/jp/bkjhindex.htm