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Zooplankton community structure and its long-term variation in the western subarctic Pacific Ocean

Research Project

Project/Area Number 12660160
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

SHIGA Naonobu  Hokkaido Univ., Grad.School of Fish.Sci., Asso.Prof., 大学院・水産科学研究科, 助教授 (30091466)

Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsWestern subarctic Pacific / Zooplankton / Wet weight / NORPAC net / Seasonal variation / Interannual variation / Copepod / Chaetognath / 北太平洋 / ゼラチン質動物プランクトン / NORPACネット標本 / ウミタル類 / サルパ類 / 長期変動 / 西部・中部亜寒帯太平洋 / 尾虫類 / 矢虫類 / 群集構造 / 湿重量
Research Abstract

Mesozooplankton biomass (wet weight), species composition and abundance were determined seasonally and interannually in the western subarctic Pacific Ocean, using NORPAC net samples (45 cm diameter, 0.33 mm mesh, 0〜150 m vertical haul) from early 1980's to early 2000's. Zooplankton community was always predominated by copepods both in term of biomass and abundance, with their peak in early summer Large copepods, Neocalanus cristatus, N.plumchrus, N.flemingeri and Eucalanus bungii were accounted for a large part of the copepod peak. This increase is interpreted as that these large copepods move up to the surface layer by early spring, in which they actively feed and rapidly growth until early summer. Following with copepods, chaetognaths and euphausiids were abaundnt, with sporadic occurence of salpids and doliolids seasonally and locally. Summer copepod biomass showed interannual variation with about one order difference, but they showed no clear relationship with hydrographic conditions, especially with surface layer temperature. Species diversity of zooplankton community in the western subarctic Pacific, where are temporally affected by the Kuroshio Extention, was implied to be higher than in the eastern subarctic Pacific (Gulf of Alaska).

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 志賀直信: "亜寒帯太平洋の尾虫類の鉛直分布"月刊海洋. 号外. 198-206 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 塩谷剛, 志賀直信, 久保直: "北海道太平洋海域の41°30'N定線上における動物プランクトン群集組成の年変動,特に橈脚類について"海と空. 77. 17-24 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Napp, J.M.…N.Shiga: "Interannual and decadal variability in zooplankton communities of the southeast Bering Sea shelf"Deep-Sea Research II. 49. 5991-6008 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kobari, T.…N.Shiga: "Interannual variations in abundance and body size in Neocalanus copepods in the central North Pacific"Journal of Plankton Research. 25. 483-494 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 山口篤, 志賀直信, ほか: "沿岸親潮における動物プランクトン群集の特徴"沿岸海洋研究. 41. 23-31 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shiga, N.: "Vertical distribution of appendicularians in the subarctic Pacific Ocean"Gekkan Kaiyo Supplement (In Japanese). No.27. 198-206 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shiotani, T., N.Shiga, N.Kubo: "Interannual variation of zooplankton community along 41°30′N latitude off south of Hokkaido, with special reference to copepods."Umi to Sora (In Japanese). 77(1). 17-24 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Napp, J.M., C.T.Baier, R.D.Brodeur, K.O.Coyle, N.Shiga, K.Mier: "Interannual and decadal variability in zooplankton communities of the southeast Bering Sea shelf."Deep-Sea Research II. 49. 5991-6008 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kobari, T., T.Ikeda, Y.Kanno, N.Shiga, S.Takagi, T.Azumaya: "Interannual variations in abundance and body size in Neocalanus copepods in the central North Pacific."Journal of Plankton Research. 25(5). 483-494 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yamaguchi, A., Y.Miwa, K.Inoue, T.Matsumoto, N.Shiga: "Characteristics of zooplakton community in the coastal Oyashio water."Bulletin on Coastal Oceanography (In Japanese). 41(1). 23-31 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J.M.Nappほか5名, 5番目: "Interannual and decadal variability in zooplankton communities of the southeast Bering Sea shelf"Deep-Sea Res. II. 49. 5991-6008 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Mochizuki, N.Shiga, M.Saito, K.Imai, Y.Nojiri: "Seasonal changes in nutrients, chlorophyll a and the phytoplankton assemblage of the western subarctic gyre in the Pacific Ocean"Deep-Sea Res. II. 49. 5421-5439 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Iidaほか5名, 6番目: "Temporal and spatial variability of coccolithophore blooms in the eastern Bering Sea, 1998-2001."Progress in Oceanography. 55. 165-175 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Mizohataほか8名, 5番目: "Bering Sea cyclonic and anticyclonic eddies observed during summer 2000 and 2001"Progress in Oceanography. 55. 65-75 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Ikeda, K.Hirakawa, N.Shiga: "Production, metabolism and production/biomass (P/B) ratio of Metridia pacifica (Crustacea ; Copepoda) in Toyama Bay, southern Japan Sea"Plankton Biology and Ecology. 49. 58-65 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 塩谷, 志賀, 久保: "北海道太平洋海域の41°30′N定線上における動物プランクトン群集組成の年変動、特に撓脚類について"海と空. 77(1). 17-24 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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