AO法およびDAPI法を用いた北太平洋海域におけるバクテリア生物量 Bacterial Biomass in the North Pacific Ocean Using Both AO Method and DAPI Method

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Author(s)

    • 簗田 満 YANADA Mitsuru
    • 北海道大学大学院水産科学研究科環境生物資源科学専攻 Division of Marine Environment and Resources, Graduate School of Fisheries Science, Hokkaido University
    • 村田 高勇 MURATA Takao
    • 北海道大学大学院水産科学研究科環境生物資源科学専攻 Division of Marine Environment and Resources, Graduate School of Fisheries Science, Hokkaido University
    • 米田 義昭 MAITA Yoshiaki
    • 北海道大学大学院水産科学研究科環境生物資源科学専攻 Division of Marine Environment and Resources, Graduate School of Fisheries Science, Hokkaido University

Abstract

北太平洋およびベーリング海の広い海域における生産層 (200m以浅) において, バクテリア量は, 有光層の炭素プールとしての量的重要性を明らかにするためにAO直接カウント法およびDAPI直接カウント法で測定された. AO法によるバクテリア数は, 1.5-33×10<SUP>5</SUP>m<I>l</I><SUP>-1</SUP>の範囲内で, いずれの海域においても50m以浅で高く, それ以深では徐々に深度とともに減少していた. DAPI法によるバクテリア数は, 1.0-23×10<SUP>5</SUP>m<I>l</I><SUP>-1</SUP>の範囲内で, ほとんどの地点および層においてAO法によるバクテリア数よりも低かった. このDAPI法とAO法の間のバクテリア数の相違は海域や深度によって変動した. この相違は, 海水中のバクテリア数が海域や深度によって変動すると同時に, 非バクテリア有機粒子もまた海域や深度によって変動することを意味していた. バクテリア炭素生物量は, 全粒状炭素量 (バクテリア炭素量も含む) の2~18%(平均: 8±4%) に相当した. この結果は, 北太平洋生産層においてバクテリア炭素生物量が植物プランクトン炭素生物量に匹敵する重要性を持つかもしれないことを示唆していた.

Bacterial abundances were extensively measured using both the AO direct count method and the DAPI direct count method in the productive layer (upper 200m) of the North Pacific Ocean and the Bering Sea in order to determine the quantitative significance of bacterial biomass as a carbon pool in the euphotic zone. The bacterial abundances measured with the AO method, with a range of 1.5-33×10<SUP>5</SUP>m<I>l</I><SUP>-1</SUP>,revealed higher values in the upper 50 mand gradually decreased at depths below 50 min all regions. The bacterial abundances measured with the DAPI method, with a range of 1.0-23×10<SUP>5</SUP>m<I>l</I><SUP>-1</SUP>, were lower than those measured with the AO method, at all stations and depths. The difference between the DAPI method and the AO method in bacterial abundance varied in term of both region and depth. This difference meant that the abundance of non-bacterial organic particles varied with the region and with the depth, while real bacterial abundance also varied with the region and with the depth. The bacterial carbon biomass accounted for 2-18%(average;8±4%) of the total particulate organic carbon pool (which including bacterial carbon). This result suggested that the quantitative significance of bacterial carbon biomass might be comparable with that of the phytoplankton carbon biomass in the productive layer of the North Pacific Ocean.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 54(3), 205-217, 2000-05-25

    The Society of Sea Water Science, Japan

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Codes

  • NII Article ID (NAID)
    10008275880
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03694550
  • NDL Article ID
    5353728
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  NDL  J-STAGE 
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