Conservation of lake ecosystems by biological interactions

• Project/Area Number: 25281044
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Modeling and technologies for environmental conservation and remediation
• Research Institution: Yokohama National University
• Principal Investigator: Itoh Kiminori 横浜国立大学, 環境情報研究科(研究院), 教授 (40114376)
• Co-Investigator(Kenkyū-buntansha): AMEMIYA TAKASHI 横浜国立大学, 環境情報研究院, 教授 (60344149)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2014: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000); Fiscal Year 2013: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
• Keywords: 湖沼生態系 / 生物間相互作用 / ウキクサ / 根圏細菌群集 / クオラムセンシング / 湖沼 / アオコ / 微生物群衆 / 根圏微生物 / 増殖抑制

Outline of Final Research Achievements

Ecosystem modeling study and laboratory experiments were carried out for lake-ecosystem conservation. Analysis of the developed mathematical model showed that cyanobacteria can be reduced by bacteria living in the rhizosphere of duckweed without reducing loading of nutrient. Algicidal effects of the bacteria called quorum sensing was investigated by using yeast cells as a model organism. It was shown that yeast cells of high density exhibited high degree of synchronization of metabolism probably due to quorum sensing. Experiments using the PCR-DGGE methods revealed that at least one community of bacteria played a significant role in reducing cyanobacteria.

Research Products

• [Journal Article] Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy (2015)
  • Author(s): Hirokazu Fujiwara, Masanori Sunagawa, Kensei Terashima, Tomoko Kittaka, Takanori Wakita, Yuji Muraoka, and Takayoshi Yokoya
  • Journal Title: Applied Physics Letter Volume: 106 Issue: 20 Pages: 202404-202407
  • DOI: 10.1063/1.4921629
  • Peer Reviewed
• [Journal Article] Effects of Cu on the content of chlorophylls and secondary metabolites in the Cu-hyper accumulator lichen Stereocaulon japonicum (2015)
  • Author(s): Nakajima, H., Hara, K., Yamamoto, Y., Itoh, K.
  • Journal Title: Ecotoxicology and Environmental Safety Volume: 113 Pages: 477-482
  • Peer Reviewed
• [Journal Article] Effects of oxytetracycline on populations and community metabolism of an aquatic microcosm (2014)
  • Author(s): K. Shibata, T. Amemiya, K. Itoh
  • Journal Title: Ecological Research Volume: 印刷中 Issue: 3 Pages: 401-410
  • DOI: 10.1007/s11284-014-1128-3
  • NAID: 40020102255
  • Peer Reviewed
• [Journal Article] The ecological roles of bacterial populations in the surface sediments of coastal lagoon environment in Japan as revealed by quantification and qualification of 16S rDNA (2013)
  • Author(s): S. Tsuboi, T. Amemiya, K. Seto, K. Itoh, N. Rajendran
  • Journal Title: World J. Microbiol. Biotechnol. Volume: 29 Pages: 759-774
  • Peer Reviewed
• [Journal Article] 酵母細胞の時空間同期現象 (2013)
  • Author(s): 雨宮隆
  • Journal Title: 信学技報 Volume: 113(17) Pages: 89-91
• [Journal Article] 生物はなぜ振動・同期するのか－酵母解糖系振動現象を例として－ (2013)
  • Author(s): 雨宮隆
  • Journal Title: 信学技報 Volume: 113(375) Pages: 25-27
• [Presentation] 細胞の階層性ダイナミクスを用いた毒性評価概念の創出 (2015)
  • Author(s): 小長谷耕平，平松直樹，柴田賢一，伊藤公紀，雨宮隆
  • Organizer: 第25回非線形反応と協同現象研究会
  • Place of Presentation: 旭川医科大学
  • Year and Date: 2015-10-03
• [Presentation] 相対群集代謝による群集レベル代謝活性の解析 (2015)
  • Author(s): 柴田賢一，雨宮隆，伊藤公紀
  • Organizer: 第62回日本生態学会
  • Place of Presentation: 鹿児島大学（鹿児島）
  • Year and Date: 2015-03-18 – 2015-03-22
• [Presentation] 抗生物質オキシテトラサイクリンのマイクロコズムへの影響 (2014)
  • Author(s): 柴田賢一，雨宮隆，伊藤公紀
  • Organizer: 第20回日本環境毒性学会研究発表会
  • Place of Presentation: 富山国際会議場（富山）
  • Year and Date: 2014-09-10 – 2014-09-11
• [Presentation] Glycolytic synchronization in yeast cells via ATP (2014)
  • Author(s): T. Amemiya
  • Organizer: Bio-Inspired Nonlinear Dynamical Systems
  • Place of Presentation: 産業技術総合研究所（つくば）
• [Presentation] Molecular process and nonlinear dynamics in glycolytic oscillations in yeast cells (2013)
  • Author(s): T. Amemiya
  • Organizer: The 2nd German-Japanese Workshop on Nonlinear Sciences and KANSEI-Informatics
  • Place of Presentation: セントコア山口(山口)
  • Invited
• [Presentation] Cell-to-cell communication in yeasts via ATP (2013)
  • Author(s): T. Amemiya
  • Organizer: 23rd Annual Meeting of MRS-Japan 2013
  • Place of Presentation: 横浜情報文化センター（横浜）
• [Presentation] 酵母解糖系振動現象におけるpHの効果 (2013)
  • Author(s): 宮田大雅，柴田賢一，雨宮隆，伊藤公紀
  • Organizer: 非線形科学の基礎から新しい情報科学・感性科学の構築へむけて
  • Place of Presentation: セントコア山口（山口）
• [Presentation] 酵母振動反応への培養齢の影響 (2013)
  • Author(s): 小長谷耕平，柴田賢一，雨宮隆，丑田公規，伊藤公紀
  • Organizer: 第23回非線形反応と協同現象研究会
  • Place of Presentation: 北大（札幌）
• [Presentation] 酵母解答系振動現象におけるpHの効果 (2013)
  • Author(s): 宮田大雅，柴田賢一，雨宮隆，伊藤公紀
  • Organizer: 第23回非線形反応と協同現象研究会
  • Place of Presentation: 北大（札幌）
• [Presentation] 微小生態系におけるコロニーパターン形成と環境影響評価 (2013)
  • Author(s): 柴田賢一，雨宮隆，伊藤公紀
  • Organizer: 第23回非線形反応と協同現象研究会
  • Place of Presentation: 北大（札幌）
• [Presentation] 酵母細胞の時空間同期現象 (2013)
  • Author(s): 雨宮隆
  • Organizer: 電子情報通信学会有機エレクトロニクス研究会
  • Place of Presentation: 沖縄県青年会館（那覇）
• [Presentation] 生物はなぜ振動・同期するのか－酵母解糖系振動現象を例として－ (2013)
  • Author(s): 雨宮隆
  • Organizer: 電子情報通信学会有機エレクトロニクス研究会
  • Place of Presentation: 屋久島環境文化村センター（屋久島）