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2004 Fiscal Year Final Research Report Summary

Abnormal water temperature downstream dam construction and its effects on river biota in some Japanese rivers.

Research Project

Project/Area Number 15510033
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental impact assessment/Environmental policy
Research InstitutionNagoya Women's University

Principal Investigator

MURAKAMI Tetuo  Nagoya Women's University, Domestic Science, Professor, 家政学部, 教授 (50329695)

Co-Investigator(Kenkyū-buntansha) HODOKI Yoshikuni  Hokkaido University, Graduated School of Environmental Science, COE Post Doctor, 大学院・地球環境科学科, COE研究員
Project Period (FY) 2003 – 2004
Keywordsprimary production / the Kiuma Ricer / water temperature / aquatic insect / dam / freshwater Rhodophyta / the Tenryu River / the Hida River
Research Abstract

Effects of dam construction on biota in its lower reaches were studied in some Japanese rivers such as the Tenryu,(Shizuoka Pref.), the Hida (Gifu Pref) and the Kuma (Kumamoto Pref) Rivers.
For species composition of primary producer, effects of low temperature water originating from upper dam impoundment on distribution of freshwater Rhodophyta was detected. Biomass of attached algae in riverbed was increased in summer just downstream dam construction, though maximum algal biomass was recorded in winter in reference rivers without such constructions. On the other hand, no significant difference of primary production rate was detected between rivers with dams and without such constructions.
Density of aquatic insects, except for Chironomidae (diptera), down reaches dam impoundments was low through the year in contrast with reference rivers. Both concentration and loading of particulate organic matte originated from dam impoundment were rapidly decreased longitudinally along the stream. Based on the observations of dominance of Trichoptera with net and of the content of their guts, consumption by aquatic insects contributed to decrease of organic matter.
The species composition of algae in guts of P1aoglossus altivelis which feed on attached algae showed significant difference between rivers with dam and that without such constructions. Filamentous Cyanophyta especially Homeothrix janthina in former and diatoms in latter were detected respectively Index of fatness (weight/(body lengths)^3 X 1,000) of P. altivelis in reference rivers were larger than that in a river with dam constructions.

  • Research Products

    (5 results)

All 2005 2004

All Journal Article (4 results) Book (1 results)

  • [Journal Article] ダム直下流の水棲昆虫群集の特徴2005

    • Author(s)
      村上哲生, 池田ゆう子, 出丸志帆, 梶川育見, 寺田寿世, 服部典子
    • Journal Title

      名古屋女子大学紀要(家政・自然編) 51

      Pages: 159-164

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Feature of aquatic insect communities just downstream of dam impoundment.2005

    • Author(s)
      Murakami, T., Ikeda, Y., Idemaru, S., Kajikawa, I.Terada, H., Hattori, N.
    • Journal Title

      Journal of Nagoya Women's University, Home Economics Natural Science (in Japanese with English abstract) 51

      Pages: 159-164

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 感潮域のプランクトン群集;起源,挙動及び河口堰が群集に及ぼした影響2004

    • Author(s)
      村上哲生
    • Journal Title

      関西自然保護機構会誌 26・2

      Pages: 79-88

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Planktonic communities in tidal rivers their origin, behavior and effects of a rivermouth barrage on communities.2004

    • Author(s)
      Murakami, T.
    • Journal Title

      Bulletin of Kansai Organization for Nature Conservation (in Japanese) 26

      Pages: 79-88

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] ダム湖の陸水学2004

    • Author(s)
      村上哲生, 林裕美子, 奥田節夫, 西條八束
    • Total Pages
      244
    • Publisher
      生物研究社
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2006-07-11  

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