北太平洋生産層における溶存DNAおよび溶存RNAの海域変動 The Regional Variations of Dissolved DNA and Dissolved RNA in the Productive Layer of the North Pacific Ocean

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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
    • 柳澤 圭 YANAGISAWA Kei
    • 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
    • 田中 仁詞 [他] TANAKA Hitoshi
    • 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

海水中の溶存DNAおよび溶存RNAは, アラスカ湾およびベリング海を含む北太平洋海域 (中央亜寒帯海域から中央熱帯海域まで) の広い海域における生産層 (200m以浅) で測定された. 溶存DNAおよび溶存RNA濃度は, すべての地点で, それぞれ0.5~16μg<I>l</I><SUP>-1</SUP>および1.8~25μg<I>l</I><SUP>-1</SUP>の範囲であり, RNA/DNAの値は1~15の範囲内であった.各海域における溶存DNAおよび溶存RNAの濃度は, 上層 (50m以浅) で高い値を示し, 下層 (100-200m層) で低い値を示した. 上層における溶存DNA濃度は, 海域的変動を示し, ベリング海で高く, アラスカ湾および中央熱帯海域で低かった.それに対して, 下層における溶存DNA濃度は海域的変動を示さなかった. 一方, 上層における溶存RNA濃度も, 海域的変動を示し, ベリング海で高く, アラスカ湾で低かった. 溶存DNA濃度の海域的変動はバクテリア生物量によって直接影響されているかもしれない.それに対して, 溶存RNA濃度はバクテリア生物量よりもむしろ現場のバクテリアの生物活性によって直接影響されているかもしれない.

Dissolved DNA (D-DNA) and Dissolved RNA (D-RNA) in seawater were measured in the productive layer (200m in depth) over a wide area of the North Pacific Ocean (from the central subarctic region to the central tropical region) including the Gulf of Alaska and the Bering Sea. The concentrations of D-DNA and D-RNA ranged from 0.5μg <I>l</I><SUP>-1</SUP> to 16μg <I>l</I><SUP>-1</SUP> and from 1.8μg <I>l</I><SUP>-1</SUP> to 25μg <I>l</I><SUP>-1</SUP> at all the stations, respectively. The ratio of RNA/DNA was within a range of 1-15 at all the stations. The concentrations of both D-DNA and D-RNA were higher in the upper water column (50m in depth) and lower in the lower water column (100-200m in depth) in respective regions. The concentration of D-DNA in the upper water column showed some regional variation; higher in the Bering Sea, and lower in the Gulf of Alaska and in the central tropical region. In contrast, the concentration of D-DNA in the lower water column did not show any regional variations. On the other hand, the concentration of D-RNA in the upper water column also showed some regional variations; higher in the Bering Sea and lower in the Gulf of Alaska. The spatial variation of D-DNA concentrations may be directly influenced by the biomass of bacteria. In contrast, the D-RNA concentrations may be directly influenced by the biological activity of bacteria in situ rather than by the biomass of bacteria.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 54(3), 218-226, 2000-05-25

    The Society of Sea Water Science, Japan

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Codes

  • NII Article ID (NAID)
    10008275898
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03694550
  • NDL Article ID
    5353750
  • 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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