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1994 Fiscal Year Final Research Report Summary

Plankton ecosystem dynamics and environment in Tokyo Bay

Research Project

Project/Area Number 04454093
Research Category

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

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionTokyo University of Fisheries

Principal Investigator

MURANO Masaaki  Dept.Fisheries, Tokyo Univ.Fisheries, Professor, 水産学部, 教授 (90013565)

Co-Investigator(Kenkyū-buntansha) MARUYAMA Takashi  Dept.Fisheries, Tokyo Univ.Fisheries, Assis.Prof., 水産学部, 助手 (60106755)
SEGAWA Susumu  Dept. Fisheries, Tokyo Univ. Fisheries, Assoc.Prof., 水産学部, 助教授 (30092589)
ISHIMARU Takashi  Dept.Fisheries, Tokyo Univ.Fisheries, Assoc. Prof., 水産学部, 助教授 (90114371)
OMORI Makoto  Dept.Fisheries, Tokyo Univ.Fisheries, Professor, 水産学部, 教授 (10013567)
Project Period (FY) 1992 – 1994
KeywordsTokyo Bay / Ecosystem / Environment / Nutrient salt / Plankton / Model
Research Abstract

We conducted monthly observations for five yesrs (1989-1993) at two stations in inner part of Tokyo Bay and for one year at 10 stations from the innermost part to the mouth of the Bay (1993) Environmental factors such as water temperature, salinity, nutrients and Chl a were measured for five years and POC and PON for one year. We tried to figure out the average feature of seasonal changes in plnakton biomass by using five-year observation data. We also analyzed the budget of nitrogen by using a box model based on the one year whole bay observation data and also made an ecosystem model of anual change in phytoplankton biomass to assess the main factors inducing the biomass fluctuation. Results are as follows ;
1. Phytoplankton blooms occur in February, July and September.
2. Concentration fo dissolved inorganic nitrogen decreased in summer but phosphate and silicate were eluted from the bottom and their concentrations increased in summer.
3. Nutrients could rarerly be a limitting factor for phytoplnkton growth in Tokyo Bay.
4. Main form of outoflowing nitrogen from Tokyo Bay to the Ocean is particulate organic form in summer and dissolved inorganic form in winter.
The main factors controlling phytoplankton biomass are solar radiation, mixing layr depth and grazing by zooplankton.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 石丸隆: "植物プランクトンの挙動とモニタリングシステム." 月刊海洋. 25. 52-54 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yanagi,T: "Tidal pump at the shelfedge." J.Oceanography. 48. 13-21 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柳哲雄: "東京湾追浜沖の流動鉛直分布の時間変動" J.Tokyo Univ.Fish.79. 127-134 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 野村英明: "東京湾における中・大型プランクトンの季節的消長" La Mer. 30. 49-56 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 野村英明: "東京湾の微小動物プランクトンとその季節的消長" La Mer,. 31. 57-72 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nomura,H: "Dense swarms of calanoid copepods in Tokyo Bay,Japan." Bull.Plankton Soc.Japan. 39. 147-149 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yanagi,T.: "Carbon budget in Tokyo Bay." J.Oceanography. 49. 249-256 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yanagi,T.: "Detailed structure of a tidal front in Osaka Bay,Japan." Mem.Fac.Engi.Ehime Univ.13. 339-347 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yu,J.: "Some improvements in the salicylate‐dichrloroisocyanurate method for determining ammonia in seawater." La Mer. 32. 119-131 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kasuya,T.: "Feeding characteristics of the lobate ctenophore,Bolinopsis mikado MOSER.21GC10:Bull Plankton Soc.Japan" 41. 57-68 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yanagi, T.M.Shimizu, T.Saino and T.Ishimaru: "Tidal pump at the shelfedge." J.Oceanogr. 48. 13-21 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nomura, H.and M.Murano: "Seasonal variation of meso-and microzooplankton in Tokyo Bay, central Japan (in Japanese)." La Mer. 30. 49-56 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nomura, H,T.Ishimaru and M.Murano: "Microzooplankton assemblage and its seasonal variation in Tokyo Bay, Japan (in Japanese)." La Mer. 30. 57-72 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yanagi, T., T.Saino, T.Ishimaru and S.Uye: "Carbon budget in Tokyo Bay." J.Oceanogr. 49 (3). 249-256 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yanagi, T., T.Yamamoto, T.Ishimaru and T.Saino: "Detailed structure of a tidal front in Osaka Bay, Japan." Mem.Fac.Engi.Ehime Univ.13. 339-347

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nomura, H,T.Ishimaru and M.Murano: "Dense swarms of calanoid copepods in Tokyo Bay, Japan." Plankton Soc.Japan. 39 (2). 147-149 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yu, J., T.Ishimaru, M.Murano and A.Ohtsuki: "Some improvements in the salicylate-dichrloroisocyanurate method for determining ammonia in seawater." La Mer. 32 (2). 119-131 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kasuya, T., T.Ishimaru and M.Murano: "Feeding characteristics of the lobate ctenophore, Bolinopsis mikado MOSER." Bull Plankton Soc.Japan. 41 (1). 57-68 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jing-Shan Yu, T.Ishimaru, Y.Koike, Y.Mine and Y.Kurita: "Seasonal variation of nutrien concentrations in Tokyo Bay (in Japanese)." J.Tokyo Univ.Fish.82 (1) (in press). (1995)

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

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Published: 1996-04-15  

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