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Flux of organic matter from phytoplankton to bacteria

Research Project

Project/Area Number 03640552
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 生態学
Research InstitutionNagoya University

Principal Investigator

HAMA Takeo  Nagoya University Water Research Institute Research associate, 水圏科学研究所, 助手 (30156385)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsPhytoplankton / Bacteria / Microbial loop / Excretion / Fatty acids / ^<13>C-GC-MS method / 溶存態有機物 / 微生物ル-プ
Research Abstract

1.Estimation of ^<13>C isotopic ratio of fatty acid by gas chromatography-mass spectrometry(GC-MS): The accuracy of the estimation of ^<13>C isotopic ratio of fatty acid was ascertained by using ^<13>C enriched palmitic acid. The results indicated the applicability of ^<13>C-GC-MS method to estimate the carbon flow from phytoplankton to bacteria.
2.Production of fatty acid at subarctic and subtropical area of Northern Pacific: ^<13>C tracer experiments were carried out at subarctic and subtropical area of Northern Pacific. Fatty acid composition of photosynthetic products of phytoplankton was determined by ^<13>C-GC-MS method. Polyunsaturated fatty acids constituted major part of products at subarctic area, whereas saturated fatty acids were main product at subtropical region. This defference was mainly due to the difference in the water temperature of these region. High contribution of polyunsaturated fatty acids at subarctic region can keep the fluid condition of membrane of phytoplankton.
3.Carbon flux to the bacterial specific fatty acids: The ^<13>C atomic ratio of bacterial specific fatty acids were estimated by GC-MS to elucidate carbon flow from phytoplankton to bacteria. Samples obtained from subarctic and subtropical region were analyzed. The ^<13>C atom % of bacterial specific fatty acids were much lower than phytoplankton fatty acids, indication that carbon flow form phytoplankton to bacteria was not high which has been suggested by ^<14>C tracer studies. However, the effects of same factors such as incubation length and ^<13>C atom% of phytoplankton carbon must be considered to estimate carbon flux.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Hama,T.: "Production and turnover rates of fatty acids in marine particulate matter through phytoplankton photosynthesis" Marine Chemistry. 33. 213-227 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hama,T.: "Primary productivity and photosynthetic products around the Kuroshio warm-core ring" Deep-Sea Research. 39S1. S279-S293 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hama,T.: "Fatty acid composition in photosynthetic products of natural phytoplankton population in Lake Biwa,Japan" J.Plankton Research. 14. 1055-1065 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hama,T.: "13C tracer methodology in microbial ecology with special reference to primary production processes in aquatic enviroments" Advances in Microbial Ecology.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Hama: "Production and turnover rates of fatty acids in marine particulate matter through phytoplankton photosynthesis." Marine Chemistry. 33. 213-227 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Hama: "Primary productivity and photosynthetic products around the Kuroshio warm-core ring." Deep-Sea Research. 39S1. S279-S293 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Hama: "Fatty acid composition in photosynthetic products of natural phytoplankton population in Lake Biwa, Japan." J. Plankton Research. 14. 1055-1065 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Hama: "^<13>C tracer methodology in microbial ecology with special reference to primary production processes in aquatic environments." Adv. Microbial Ecol.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hama,T.: "Primary productivity and photosynthetic products around the Kuroshio warmーcore ring" DeepーSea Research. 39S1. S279-S293 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Hama,T.: "Fatty acid composition in photosynthetic products of natural phytoplankton population in Lake Biwa,Japan" J.Plankton Research. 14. 1055-1065 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Hama,T.: "13C tracer methodology in microbial ecology with speciareference to primary production processes in aquatic environments" Advances in Microbial Ecology.

    • Related Report
      1992 Annual Research Report
  • [Publications] Tekeo Hama: "Characterization of extracellular products of natural phytoplankton population by 13CーGCーMS method" Marine Chemistry.

    • Related Report
      1991 Annual Research Report
  • [Publications] Takeo Hama: "Carbon flow analysis from phytoplankton to bacteia;evaluation from from the production of fatty acids specific for bacteria" DeepーSea Research.

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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