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FACTORS CONTRORING THE EFFICIENCY OF THE BIOLOGICAL PUMP IN THE COASTAL EUPHOTIC ZONE-ANALYSIS FROM BIOLOGICAL, ELEMENTAL AND ORGANIC MOLECULES-

Research Project

Project/Area Number 11440226
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionUNIVERSITY OF TSUKUBA

Principal Investigator

HAMA Takeo  UNIVERSITY OF TSUKUBA, INSTITUTE OF BIOLOGICAL SCIENCES, ASSOCIATE PROFESSOR, 生物科学系, 助教授 (30156385)

Co-Investigator(Kenkyū-buntansha) YAMAGUCHI Yukuya  TOKYO UNIVERSITY OF FISHERIES, DEPARTOMENT OF FISHERIES, PROFESSOR, 水産学部, 教授 (70114220)
INOUE Isao  UNIVERSITY OF TSUKUBA, INSTITUTE OF BIOLOGICAL SCIENCES, PROFESSOR, 生物科学系, 教授 (70168433)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2000: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥12,000,000 (Direct Cost: ¥12,000,000)
KeywordsBIOLOGICAL PUMP / PRIMARY PRODUCTION / EXPORT PRODUCTION / PHYTOPLANKTON / VERTICAL TRANSPORT / CARBOHYDRATES
Research Abstract

The field observation in Sagami Bay and off Shimoda, Japan has been carried out to assess the seasonal changes in the primary productivity and the composition of photosynthetic products. The relation between the primary production process and the vertical transport process of organic matter has been also studied.
1) The primary productivity at the center of the Sagami Bay showed maxim in October and April. This strongly suggests that the primary productivity primary depended on the supply of the nutrients due to the vertical mixing of water mass.
2) The contribution of carbohydrates in the photosynthetic products tended to increase in summer period. Nutrient depletion in upper layer in summer is likely resulted in the increase in the contribution of carbohydrates.
3) The export ratio, which is calculated from the production rate and the sinking rate of organic matter measured off Shimoda, exhibited unusual high values around 1. The lateral transport and resuspension of sediment organic matter are probably main reasons of the high export ratio.
4) Carbohydrates showed the high export ratio more than 1, fatty acids, on the other hand, exhibited the low export ratio around 0.3. This results clearly shows that carbohydrates concerns the formation of the sinking particles and play an important roles in the vertical transport of organic materials.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] K.H.Shin and T.Hama et al.: "Dynamics of fatty acids in newly biosynthesized phytoplankton cells and seston during a spring bloom"Marine Chemistry. 70. 243-256 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hama: "Production and tumover of organic matter through phytoplankton photosynthesis.N.Handa,E.Tanoue and T.Hama (eds.)"Terra Scientific Publishing. 38 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.H.Shin, T.Hama et al.: "Dynamics of fatty acids in newly biosynthesized phytoplankton cells and seston during a spring bloom."Marine Chemistry. 70. 243-256 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Hama: "Production and turnover of organic matter through phytoplankton photosynthesis.""Dynamics and characterization of marine organic matter" N.Handa, E.Tanoue and T.Hama (eds), Terra Scientific Publishing. 1-38 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.H.Shin,T.Hama et al.: "Dynamics of fatty acids in newly biosynthesized phytoplankton cells and seston during a spring bloom"Marine Chemistry. 70. 243-256 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hama: "Production and turnover of organic matter through phytoplankton photosynthesis."Terra Scientific Publishing. 38 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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