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Secondary biological pump driven by food web interactions : A case study in Lake Biwa for gloval environmental issues

Research Project

Project/Area Number 08308031
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

NAKANISHI Masami  Center for Ecological Research, Kyoto Univ., Professor, 生態学研究センター, 教授 (60025434)

Co-Investigator(Kenkyū-buntansha) SUGIYAMA Masato  Department of Natural Environment Sciences, Faculty of Integrated Hu Studies, Ky, 総合人間学部, 助教授 (10179179)
NAKAYAMA Eiitirou  School of environmental science, Shiga prefectural Univ., Associate Prof., 環境科学部, 助教授 (50108982)
OOKUBO Keizi  Faculty of environmental science and technology, Okayama Univ., Associate Profes, 環境理工学部, 助教授 (50135612)
URABE Zyoutarou  Center for Ecological Research, Kyoto Univ., Associate Professor, 生態学研究センター, 助教授 (50250163)
熊谷 道夫  滋賀県琵琶湖研究所, 主任研究員 (40234512)
紀本 岳志  (財)海洋科学研究所, 研究員
東 正彦  京都大学, 生態学研究センター, 教授 (40183917)
和田 英太郎  京都大学, 生態学研究センター, 教授 (40013578)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥21,700,000 (Direct Cost: ¥21,700,000)
Fiscal Year 1997: ¥10,300,000 (Direct Cost: ¥10,300,000)
Fiscal Year 1996: ¥11,400,000 (Direct Cost: ¥11,400,000)
KeywordsLake Biwa / sedimentation flux / biological production-decomposition / zooplankton / phytoplankton / bacteria / climate change / food chain / リン / 鉛直輸送 / 基礎生産 / 炭素 / 降雨量 / 脂肪酸
Research Abstract

To understando responses of aquatic ecosystems to global environmental change, we studied biological and decomposition processes in relation to environmental variables such as nutrients, light and water temperature, and relations between sedimentation flux of biological products and food chains.
1) Primary production of phytoplankton was limited by phosphorus in the layr above 5 m deep but by light intensity below 5 m deep. 2) Decomposition rate by bacteria was limited by phosphorus in the epilimnion and by water temperature in the hypolimnion.
3) Sedimentation flux corresponded with 12% of daily production of phytoplankton and most of the phytoplankton production were consumed by zooplankton and bacteria in the epilimnion. 4) 20-30% of the sedimentation flux were assimilated by Amphipoda gammarid in the aphotic zone. 5) The sedimentation flux changed seasonally depending on precipitation and propagation of microplanktonic algae such as Fragilaria crotonensis.
Biological production-decomposition rates and the sedimentation flux in Lake Biwa were strongly influensed by physical variable like light and water temperature, and food web structure. Further, they related closely to nutrients inflowing from rivers. These results suggest that climate change controlling precipitation, light, water temperature and nutrients influences directly acquatic ecosystems through processes of biological production-decomposition and vertical transportation of particulate organic matter.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Nakanishi, M.and T.Sekino: "Recent drastic changes in Lake Biwabio-Communities,with special attention to exploitation of the littoral zone." GeoJournal. 40.1-2. 63-67 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Urabe, J., J.Clasen and R.W.Sterner: "Phosphorus limitation of Daphnia growht:is it real?" Limnol.Oceanogr.,. 42:. 1436-1443 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Trevorrow, M.and Tanaka, Y.: "Acoustic and in-situ measurements of freshwater amphipods(Jesogam marus annandalei)in Lake Biwa,Japan" Limnol.Oceanogr.42(1). 121-132 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tanaka, Y.and Tsuda, R.: "Daily fluctuations in thermal stratification,chlorophyll a,turb idity and dissolved oxygen concentration in Lake Biwa" Jap.J.Limnol.57,(4(2)). 377-393 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakanishi, M.and T.Sekino: "Recent drastic changes in LakeBiwa bio-communities, with special attention to exploitation of the littoral zone." GeoJournal. 40.1-2. 63-67 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Urabe, J., J.Clasen and R.W.Sterner: "Phosphorus limitation of Daphnia growht : is it real?" Limnol.Oceanogr.42. 1436-1443 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Trevorrow, M.and Tanaka, Y.: "Acoustic and in-situ measurements of freshwater amphipods (Jesogam marus annandalei) in Lake Biwa, Japan." Limnol.Oceanogr.42 (1). 121-132 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tanaka, Y.and Tsuda, R.: "Daily fluctuations in thermal stratification, chlorophyll a, turb idity and dissolved oxygen concentration in Lake Biwa." Jap.J.Limnol. 57, (4(2)). 377-393 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakanishi,M.and T.Sekino: "Recent drastic changes in Lake Biwabio-communities,with special attention to exploitation of the littoral zone." Geo Journal. 40.1-2. 63-67 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Urabe,J., J.Clasen and R.W.Sterner: "Phosphorus limitation of Daphnia growht : is it real?" Limnol.Oceanogr.42:. 1436-1443 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 杉山雅人: "水中懸濁物質の多元素同時分析" 分析化学. 45. 667-675 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 森川 浩, 大久保賢治, 村本嘉雄, 江副 哲: "成層湖における濁水貫入層の形成機構" 水工学論文集. (第41巻). 489-494 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Trevorrw,M. and Tanaka,Y.: "Acoustic and in-situ measurements of freshwater amphipods (Jesogam marus annandalei) in Lake Biwa,Japan." Limnol.Oceanogr.42(1). 121-132 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tanaka,Y. and Tsuda,R.: "Daily fluctuations in thermal stratification,chlorophyll a,turb idity and dissolved oxygen concentration in Lake Biwa" Jap.J.Limnol.57,(4(2)). 377-393 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Urabe,J.: "Grazing and foos size selection of zooplankton community in Lake Biwa." Jpn.J.Limmol.57・1. 27-37 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nagata,T.: "Trophic transfer via a picoplankton flagellate-copepod food chain during a picocyanobacterial bloom in Lake Biwa." Arch.Hydrobiol.137・2. 145-160 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Sekino,T.: "Inter- and intra-specific differences in fatty aicd compsition of freshwater crustacean zooplankton." Freshwater Biol.(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yamada,Y.: "Distribution of Carbon and Nitrogen ratios in the yodo rever watershed." Jpn.J.Limnol.(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakanishi,M.: "Recent drastic changes in Lake Biwa bio-communities,with special attention to exploitation of the littoral zone." GeoJournal. 40巻1-2号. 63-67 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakano,S.: "Bacterial response to extracellilar discolved organic carbon released form healthy and scenescent Fragilaria(Bacillariophyceae)in experimental systems." Hydrobiologia. 339. 47-55 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Abe,T.Levin,S.A. and Higashi,M.: "Biodiversity,and Ecological Persepeclive" Springer, 294 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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