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Interaction between natural planktonic ecosystem and cultured animals in the coastal aquaculture environment.

Research Project

Project/Area Number 10660177
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionMie University

Principal Investigator

TANIMURA Atsushi  Mie University, Fac.of Bioresources, Associate Professor, 生物資源学部, 助教授 (10125213)

Co-Investigator(Kenkyū-buntansha) KAWAMURA Akito  Mie University, Fac.of Bioresources, Professor, 生物資源学部, 教授 (10111163)
石川 輝  三重大学, 生物資源学部, 助手 (00273350)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsculture farming / natural plankton ecosystem / Ago Bay / Matoya Bay / nutrients / chlorophyll a / microbial food chain / river discharge / 英虞湾 / カイアシ類 / Olthona / Acartia / Paracalanus / クロロフィルa / 物質循環 / 種の多様性 / ピコプランクトン / ナノプランクトン
Research Abstract

The aim of the present study is to assess the possible environmental impact caused by culture farming and river discharge. Intensive data collection and observations were carried out during 1996 and 2000 to determined the variations of physical and chemical parameters and their impacts on the natural plankton ecosystem in Ago Bay and Matoya Bay, which are both typical embayments with pearl oyster and/or oyster culture grounds, respectively.
In Ago Bay, nutrients were continuously supplied from the bottom sediment during summer. The size-fractionated chlorophyll a measurements and the microscopic observations revealed that the picoplankton and nanoplankton were major components in term of carbon biomass throughout the year. The calculated potential carbon flow from pico-sized plankton including bacteria to micro-sized plankton indicate that the conduit for organic materials is driven inainly through the microbial food web, e.g. picoplankton-heterotrophic nanoflagellates-microzooplankton, … More througout the year. It is also suggested that the microbial food chain affect the mesozooplankton biomass.
In Matoya Bay, the phytoplankton biomass based on chlorophyll a increased in summer and autumn. NO_3-N was mainly supplied from the inflow rivers and the concentration increased in summer and autumn in the bay. PO_4-P and NO_2-N were mainly supplied through regeneration from the bottom at the interior bay, and the active regeneration of PO_4-P occurred in summer and autumn. The main source of SiO_2-Si in the bay was the inflow rivers, but it also influenced by regeneration from the bottom at the interior bay in summer and autumn. Redfield-ratio and half saturation constants were indicated that phytoplankton biomass in the bay was usually limited by nitrogen, and occasionally, by phosphorus when river flow was higher in summer and autumn. Therefore, it was suggested that loading nitrogen from the inflow rivers and active regeneration of PO_4-P from the bottom at the interior bay triggered the increase of phytoplankton biomass in summer and autumn. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 今井直: "養殖漁場としての的矢湾の低次生産環境特性"三重大学生物資源学部紀要. 23. 1-12 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 今井直: "的矢湾における主要流入河川の環境特性と湾内の栄養塩濃度への影響"水産海洋研究. 64. 144-154 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 今井直: "河川水の流入が的矢湾の植物プランクトン現存量に及ぼす影響"水産海洋研究. 64. 215-223 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ishikawa,A.: "Vegitative cell and cyst assemblages of armored dinoflagellates in Onagawa Bay,northeast Japan."Plankton Biol.Ecol.. 47. 12-22 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Imai, T.: "Characteristics of environmental conditions affecting the primary production in Matoya Bay, central Japan."The Bulletin of the Faculty of Bioresources Mie University. 23. 1-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Imai, T.: "Environmental characteristics of inflow rivers and their influence to the water quality in Matoya Bay, central Japan."Bulletin of the Japanese Society of Fisheries Oceanography. 64. 144-154 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Imai, T.: "Influence of river discharge to the phytoplankton biomass in Matoya Bay, central Japan."Bulletin of the Japanese Society of Fisheries Oceanography. 64. 215-223 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ishikawa, A: "Vegitative cell and cyst assemblages of armored dinoflagellates in Onagawa Bay, northeast Japan."Plankton Biol.Ecol.. 47. 12-22 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 今井直: "的矢湾における主要流入河川の環境特性と湾内の栄養塩濃度への影響"水産海洋研究. 64(3). 144-154 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 今井直: "河川水の流入が的矢湾の植物プランクトン現存量に及ぼす影響"水産海洋研究. 64(4). 215-223 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 今井 直: "養殖漁場としての的矢湾の低次生産環境特性"三重大学生物資源学部 紀要. 23. 1-12 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Ishikawa,A.: "Vegitative cell and cyst assamblages of armo red dinoflagellates in Onagawa Bay, northeast Japan"Plankton Biology and Ecology. 47. 12-22 (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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