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1988 Fiscal Year Final Research Report Summary

Studies on inter-relationships between phytoplankton and zooplankton in patchy distributional manner

Research Project

Project/Area Number 60440016
Research Category

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

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionTohoku University

Principal Investigator

TANIGUCHI Akira  Faculty of Agriculture,Tohoku University, 農学部, 教授 (30002091)

Co-Investigator(Kenkyū-buntansha) SASAKI Hiroshi  Ditto, 農学部, 教務職員 (10183378)
FUJITA Naoji  Ditto, 農学部, 助手 (10005639)
NAKAMURA Yasue  Faculty of Agriculture,Tohoku University, 農学部, 助手 (10005613)
Project Period (FY) 1985 – 1988
Keywordsepibenthic plankton / feeding activity of copepods / mixotroph / plankton patch / planktonic ciliates / 混合栄養者
Research Abstract

The main aims of this project are to figure out the patchy distributions of phytoplankton and zooplankton in nature and then determine the inter-relationships between phytoplankton and zooplankton at different population densities, which may occur in nature depending on the presence or absence of patches. The data obtained can be summarized as below.
(1) Many instances of patchy distribution in fine scale of both phyto- and zooplankton in various sea areas were recorded by continuous towings of a Longhurst-Hardy Plankton Recorder and a Scatter-Fluorescence-Temperature-Depth Recorder.
(2) Diel rhythms in feeding activity of herbivorous copepods were found in natural populations Magnitudes of the rhythm changing with different feeding/starving regimes was also examined. Then ecological significance of diel vertical migration of copepods, which makes copepods encounter periodically phytoplankton patches in the surface layer, could be speculated.
(3) Distributional patterns of phytoplankton and heterotrophic and mixotrophic planktonic ciliates in Onagawa Bay were illustrated. Despite very weak swimming ability of the ciliates, each species seems to keep its specific position in water column which might be controlled by the degree of dependence on phtoplankton as a energy source.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Yamamoto,T.: Deep-Sea Res.33. 1729-1740 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sasaki,H.: Deep-Sea Res.35. 505-515 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamamoto,T.: J.Plankton Res.10. 1113-1130 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 谷口旭: 水産海洋研究会25周年記念誌. 記念号. 273-281 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石井晴人: 東北大学大学院農学研究科博士学位論文. 1-123 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西澤敏 編: "生物海洋学ー低次食段階論ー" 恒星社厚生閣, 300 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamamoto, T.; S. Nishizawa: "Small-scale zooplankton aggregation at the front of a Kuroshio warm-core ring" Deep-Sea Research. 33. 1729-1740 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sasaki, H.; H. Hattori; S. Nishizawa: "Downward flux of particulate organic matter and vertical distribution of calanoid copepods in the Oyashio Water in summer" Deep-Sea Research. 35. 505-515 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamamoto, T.; S. Nishizawa; A.Taniguchi: "Formation and retention mechanisms of phytoplankton peak abundance in the Kuroshio front" Journal of Plankton Research. 10. 1113-1130 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taniguchi, A.; T. Yamamoto: "Hetergeneous distribution of plankton community in the frontal areas and its fisheries oceanographical aspects" Suisan Kaiyo Kenkyukai-ho. Special Issue. 273-281 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ishii, H.: "Studies on feeding activity of herbivorous copepods with special reference to its diel rythm" ph.D. Thesis, Tohoku University. 1-123 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishizawa, S. (Editor): Biological Oceanography (Partim). Koseisha Koseikaku, Tokyo, 300 (1989)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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