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Study on Areal Expansion of Harmful Plankton

Research Project

Project/Area Number 06454099
Research Category

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

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionThe University of Tokyo

Principal Investigator

FUKUYO Yasuwo  Asian Natural Environmental Science Center, the University of Tokyo, Associate Professor, アジア生物資源環境研究センター, 助教授 (10165318)

Co-Investigator(Kenkyū-buntansha) NANBA Kenji  Fac.of Agriculture, the Univ.of Tokyo, Assistant Professor, 大学院・農学生命科学研究科, 助手 (70242162)
MATSUOKA Kazumi  Faculty of Liberal Arts, Nagasaki University, Professor, 水産学部, 教授 (00047416)
井上 博明  東京大学, 農学部, 助手 (40223268)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1995: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1994: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsHarmful plankton / Dinoflagellate / Toxic dinoflagellate / Alexandrium / Cyst / Paralytic shellfish poisoning / Areal Expansion of Harmful Plankton / Cyst Sedimentation
Research Abstract

Surface sediments were collected by using TU-1 piston corer at Tanabe Bay, Wakayama Prefecture, and Ofunato Bay, Iwate Prefecture, to investigate whether toxic dinoflagellates of the areas occurred long time before the first finding, by comparing cyst distribution in the sediment with plankton record.The sediment core was cut every 1 or 2 cm interval.Alexandrium cyst concentration, age of sediment, and compaction rate of each fraction were analyzed.
The TU-1 corer was evaluated as the best among three types of corers including KK and Frager gravity corers regarding the amount of sediment collected and avoidance of mixture of layrs.For measurement of sediment age, the vertical distribution of lead 210 was analyzed by using alpha emission from polonium 210, in addition to the measurement of water contents of the fraction.
In Tanabe Bay, Alexandrium cysts were found in all fractions from surface to 30cm deep, having maximum concentration of 175 cysts/cm^3 at3-4cm deep.The deepest layr of 28-30cm in which Alexandrium cysts were detected accumulated around 1945, taking into account of the sedimentation rate as 0.98 cm/y and the compaction rate.As the first finding of planktonic Alexandrium was made in 1980, the organism has already occurred about 35 years before the first observation.In Ofunato Bay, Alexandrium cysts were found in all fractions from surface to 14cm deep, having maximum consentration of 1,620 cysts/cm^3at2-3cm deep.The deepest layr of 12-14cm in which Alexandrium cysts were detected deposited between 1898 and 1914, taking into account of the sedimentation rate as 0.23cm/y and the compaction rate.As the first finding of planktonic Alexandrium was reported in 1963, the organism has already occurred about 50 to 60 years before the first observation.
These findings indicate that Alexandrium has occurred a long time before the first observation, and invasion of the species might not occur recently.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 松岡數充他1名: "渦鞭毛藻-Gymonodinium類-接合子の役割と残存性" 月刊 海洋. 27. 613-618 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 松岡數充他1名: "IOC Manual on Harmful Marine Microplankton" ユネスコ(UNESCO), 551 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 福代康夫: "Alexandrium in″赤潮の科学(改訂増補版)″" 恒星杜厚生閣, 337 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumi Matsuoka: "Dinoflagellates-Gymnodinium group-Role and Survivability of Zygotes" Gekkan Kaiyou. 27. 613-618 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kazumi Matsuoka: "Cyst Methodologies" IOC Manual on Harmful Marine Microplankton. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yasuwo Fukuyo: "Alexandrium" Science of red tides. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 松岡數充他1名: "渦鞭毛藻-Gymonodinium類-接合子の役割と残存性" 月間 海洋. 27. 613-618 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 松岡數充他1名: "Cyst Methodologies in "IOC Manual on Harmful Marine Microplankton"" ユネスコ(UNESCO)(印刷中), (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 福代康夫: "Alexandrium in "赤潮の化学(改定増補版)"" 恒星社厚生閣(印刷中), (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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