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Analyses of food web and biodiversity mechanism of Lake Taihu where the occurrence of water bloom is normalized

Research Project

Project/Area Number 16H02747
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Civil and environmental engineering
Research InstitutionTohoku University

Principal Investigator

Nishimura Osamu  東北大学, 工学研究科, 教授 (80208214)

Co-Investigator(Kenkyū-buntansha) 宮田 直幸  秋田県立大学, 生物資源科学部, 教授 (20285191)
坂巻 隆史  東北大学, 工学研究科, 准教授 (60542074)
野村 宗弘  東北大学, 工学研究科, 助教 (70359537)
藤林 恵  秋田県立大学, 生物資源科学部, 助教 (70552397)
Research Collaborator Okano Kunihiro  
Maruo Chikako  
Tanaka Nobuyuki  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥37,700,000 (Direct Cost: ¥29,000,000、Indirect Cost: ¥8,700,000)
Fiscal Year 2018: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Fiscal Year 2017: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2016: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Keywords食物連鎖 / 藍藻 / 富栄養化 / 湖沼 / 必須脂肪酸 / 微小後生動物 / 有機物 / 原生動物 / 食物網 / 生物多様性 / 堆積物 / 土木環境システム
Outline of Final Research Achievements

In this study, it is to clarify how aquatic animals acquire essential fatty acids necessary for survival and reproduction while cyanobacteria predominately over other algae in Lake Taihu.
As a result, it was suggested that cyanobacteria might not be an important food source for all aquatic animals appearing in Lake Taihu, but it was important for shrimp. In addition, it was revealed that fish such as Hypomesus nipponensis ingested carbon of cyanobacteria at Lake Hachiro during the occurrence of water bloom. Furthermore, it was revealed that the micrometazoan Aeolosoma can reproduce itself by synthesizing essential fatty acids such as eicosapentaenoic acid.

Academic Significance and Societal Importance of the Research Achievements

本研究では,微小後生動物Aeolosomaが自ら必須脂肪酸EPAを合成して再生産可能であることが明らかになった.EPAは珪藻のバイオマーカーであることが示すよう,生態系においては珪藻のみが合成可能であり,高次捕食者は珪藻を直接あるいは間接に捕食してEPAを摂取する必要があると考えられてきた.しかし,このような動物の存在が藍藻優占下での生物多様性保全のキースピーシーズとして機能している可能性が考えられ,生物多様性を保全するための情報として有用である.地球温暖化により湖沼は藍藻の異常増殖が常態化すると予想され,本知見の活用によって湖沼生態系サービスの持続的な利用の可能性を拡大することができる.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (7 results)

All 2018 2017 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] 東南大学(中国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] 東南大学(中国)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Nutritional quality of fish faeces is enhanced by highly unsaturated fatty acid-producing heterotrophic protozoa2018

    • Author(s)
      215.Fujibayashi Megumu, Tanaka Nobuyuki, Hashido Shun, Takasawa Aya, Nishimura Osamu, Nutritional quality of fish faeces is enhanced by highly unsaturated fatty acid-producing heterotrophic protozoa, ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY, 89, 21-26, 2018
    • Journal Title

      ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY

      Volume: 89 Pages: 21-26

    • DOI

      10.1016/j.actao.2018.04.003

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Transfer of cyanobacterial carbon to a higher trophic-level fish community in a eutrophic lake food web: fatty acid and stable isotope analyses2018

    • Author(s)
      Megumu Fujibayashi, Kunihiro Okano, Yoshihiro Takada, Hitoshi Mizutani, Noriko Uchida, Osamu Nishimura, Naoyuki Miyata
    • Journal Title

      Oecologia

      Volume: 188 Issue: 3 Pages: 901-912

    • DOI

      10.1007/s00442-018-4257-5

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Azo dye degradation pathway and bacterial community structure in biofilm electrode reactors2018

    • Author(s)
      216.Xian Cao, Hui Wang, Shuai Zhanga, Osamu Nishimura, Xianning Li
    • Journal Title

      CHEMOSPHERE

      Volume: 208 Pages: 219-225

    • DOI

      10.1016/j.chemosphere.2018.05.190

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Cyanobacterial carbon transfer to higher trophic level in eutrophic lake Taihu2018

    • Author(s)
      Xian Cao, Xiaoguang Xu, Megumu Fujibayashi, Osamu Nishimura, Takashi Sakamaki, Munehiro Nomura
    • Organizer
      17th World Lake Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 後生動物Aeolosomaによる必須脂肪酸の合成能の検討2017

    • Author(s)
      関谷大河、林恭平、田中伸幸、野村宗弘、西村修
    • Organizer
      土木学会東北支部技術研究発表会
    • Related Report
      2016 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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