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2001 Fiscal Year Final Research Report Summary

Role of diatom bloom irf marine ecosystem

Research Project

Project/Area Number 12480145
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionUniversity of Shiga Prefecture (2001)
Hokkaido University (2000)

Principal Investigator

BAN Shuhei  University of Shiga Prefecture, School of Environmental Science, Associate Professor, 環境科学部, 助教授 (50238234)

Co-Investigator(Kenkyū-buntansha) ISODA Yutaka  Hokkaido University, Graduate School of Fisheries Science, Associate Professor, 大学院・水産科学研究科, 助教授 (10193393)
KUDO Isao  Hokkaido University, Graduate School of Fisheries Science, Associate Professor, 大学院・水産科学研究科, 助教授 (00195455)
MARUO Masahiro  University of Shiga Prefecture, School of Environmental Science, Assistant Professor, 環境科学部, 助手 (80275156)
Project Period (FY) 2000 – 2001
Keywordsdiatom bloom / grazing food chain / microbial loop / mesozooplankton / dissolved organic carbon / microzooplankton / bacteria / dinoflagellates
Research Abstract

We examied zoo-and phytoplankton biomass, bacterial biomass, primary production, bacterial production, meso- and microzooplankton grazing during the period from pre- to post-spring-diatom bloom in Funka Bay, Hokkaido, Japan, to clarify the fate of spring diatom bloom. Diatom bloom started in February at 3 - ℃, lasted by mid-March. During the blooming period, mesozooplankton biomass was alyways low, and consequently its grazing was also quite low level. Microzooplankton increased during the blooming period, but did not graze diatoms Whereas, bacterial production increased during the bloomin period, but its biomass was constant. Using these results, we estimated the carbon budget through food web in the bay. During the blooming period, carbon produced by diatoms was carcely transported to mesozooplankton through grazing food chain due to low mesozooplankton biomass, while microbial loop dominated through bacterial production usingdissolved organic carbon (DOC) from diatoms. On the contrary, after the bloom, two distinct loops existed, i. e. one is dinofragellates to mesozooplankton though regenerated inorganic nutrients by mesozooplankton, while another one is bacteria to protists to mesozooplankton through DOC excreted by mesozooplankton. These results suggest that spring diatom bloom supports indirectly mesozooplankton production through DOC excreted by diatoms, while after the bloom nutrients and DOC regenerated by mesozooplankton supported dinofragellate production and subsequently mesozooplankton themselves.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Kudo, I.: "Environmental factors affecting the occurrence and production of the spring phytoplankton bloom in Funka Bay, Japan"J. Oceanogr.. 55. 505-513 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ban, S.: "In situ egg production and hatching success of the marine copepod Pseudocalanus newmani in Funka Bay and adjacent waters off southwestern Hokkaido, Japan : associated to diatom bloom"J. Plankton Res.. 22. 907-922 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kudo, I.: "Exhaustion of nitrate terminates a phytoplanklon bloom in Funka Bay, Japan change in SiO_4:NO_3 consumption rate during the bloom"Mar. Ecol. Prog. Ser.. 193. 45-51 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lee, C.W.: "Bacterial abundance and production and their relation to primary production in Funka Bay"Plankton Biol. Ecol.. 48. 1-9 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lee, C.W.: "Bacterial abundance and production and heterotrophic nanoflagellate abundance in subarctic coastal waters (Western North Pacific Ocean)"Aquatic Microbial. Ecol.. 23. 263-271 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lee, C.W.: "Examining the relationship between bacteria and heterotrophic nanoflagellates in Funka Bay (Japan) using the size-fractionation method"Aquatic Ecol.. 35. 1-9 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimizu.M.: "A late winter hydrography in Hidaka Bay, south of Hokkaido, Japan"J. Oceangr.. 57. 385-395 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Azumaya, T.: "Modeling of the spring bloom in Funka Bay, in Japan"Continental Shelf Res.. 21. 473-494 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lee, C.W.: "Dynamics of bacterial respiration and related growth efficiency, dissolved nutrients and dissolved oxygen concentration in a subarctic coastal embayment"Mar. Freshwater Res.. 53. 1-7 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kudo I.: "Environmental factors affecting the occurence and prodution of the spring phytoplanton bloom in Funka Bay, Japan"J. Oceanogr.. 55. 505-513 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ban S.: "In situ egg production and hatching success of the marine copepod Pseudocalanus newmani in Funka Bay and adjacent waters off southwestern Hokkaido, Japan : associated to diatom bloom"J. Plankton Res.. 22. 907-922 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kudo I.: "Exhaustion of nitrate terminates a phytoplankton bloom in Funka Bay, Japan : change in SiO_4 : NO_3 consumption rate during the bloom"Mar. Ecol. Prog. Ser.. 193. 45-51 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lee C. W.: "Bacterial abundance and production in Funka Bay"Plankton Biol. Ecol.. 48. 1-9 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lee C. W.: "Bacterial abundance and production and heterotrophic nanoflagellate abundance in subarctic coastal waters (Western North Pacific Ocean)."Aquat. Mico. Ecol.. 23. 263-271 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lee C. W.: "Examining the relationaship between bacteria and heterotrophic nanoflagellates in Funka Bay (Japan) using the size-fractionation method"Aquat. Ecol.. 35. 1-9 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shimizu M.: "A late winter hydrography in Hidaka Bay, south of Hokkaido, Japan"J. Oceanogr.. 57. 385-395 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Azumaya T.: "Modeling of the spring bloom in Funka Bay, Japan"Continental Shelf Res.. 21. 473-494 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lee C. W.: "Dynamics of bacterial respiration and relaed growth efficiency, dissolved nutrients and dissolved oxygen concentration in a subarctic coastal embayment"Mar. Freshwater Res.. 53. 1-7 (2002)

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

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Published: 2003-09-17  

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