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Complex functions of trace metals on regulation of nitrogen cycle in the subsurface ocean

Research Project

Project/Area Number 26550010
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Environmental dynamic analysis
Research InstitutionNagasaki University

Principal Investigator

TAKEDA Shigenobu  長崎大学, 水産・環境科学総合研究科(水産), 教授 (20334328)

Co-Investigator(Renkei-kenkyūsha) WADA Minoru  長崎大学, 水産・環境科学総合研究科(水産), 教授 (70292860)
UMEZAWA Yu  長崎大学, 水産・環境科学総合研究科(水産), 准教授 (50442538)
Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords海洋生態 / 物質循環 / 微量金属 / 窒素 / 植物プランクトン / 鉄
Outline of Final Research Achievements

Based on the field observations and on board incubation experiments conducted in the North Pacific Ocean, it become clear that the phytoplankton assemblages in the subsurface chlorophyll maximum layer are under severe iron-limitation, and that nitrate consumption by phytoplankton can be stimulated under iron-sufficient conditions. Although dissolved zinc and cobalt concentrations also decreased at the subsurface chlorophyll maximum layer, there was no response in phytoplankton growth in the zinc or cobalt enrichment incubation experiments. These results support a hypothesis that iron limitation stimulates nitrite release from phytoplankton cells to the surrounding water due to inhibition of nitrate metabolic pathway, and causes formation of the primary nitrite maximum in the oceanic subsurface layer.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (6 results)

All 2016 2015 2014

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results)

  • [Journal Article] Why is Trichodesmium abundant in the Kuroshio?2015

    • Author(s)
      Shiozaki, T., S. Takeda, S. Itoh, T. Kodama, X. Liu, F. Hashihama, K. Furuya
    • Journal Title

      Biogeosciences

      Volume: 12 Issue: 23 Pages: 6931-6943

    • DOI

      10.5194/bg-12-6931-2015

    • NAID

      120006986819

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Surface and middle layer enrichment of dissolved copper in the western subarctic North Pacific2015

    • Author(s)
      I. Tanita, S. Takeda, M. Sato, K. Furuya
    • Journal Title

      La Mer

      Volume: 53 Pages: 1-18

    • NAID

      40020749627

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Presentation] 太平洋の170°W線に沿った表層200m以浅における溶存微量金属濃度の南北分布2016

    • Author(s)
      武田重信
    • Organizer
      東京大学大気海洋研究所 共同利用研究集会
    • Place of Presentation
      東京大学(千葉県柏市)
    • Year and Date
      2016-02-18
    • Related Report
      2015 Annual Research Report
  • [Presentation] 東部東シナ海陸棚域における亜表層クロロフィル極大層と硝酸塩躍層の1日スケール変動2016

    • Author(s)
      藤田裕也, 近藤能子, 武田重信
    • Organizer
      九州大学応用力学研究所共同利用研究集会
    • Place of Presentation
      九州大学(福岡県春日市)
    • Year and Date
      2016-02-06
    • Related Report
      2015 Annual Research Report
  • [Presentation] 東部東シナ海における亜表層クロロフィル極大層付近の栄養塩環境2015

    • Author(s)
      武田重信,増田阿美
    • Organizer
      名古屋大学地球水循環研究センター共同利用研究集会
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2015-06-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] Clean seawater sampling for trace metals during Japanese GEOTRACES cruises2014

    • Author(s)
      H. Obata, J. Nishioka, T. Kim, K. Norisuye, S. Takeda, Y. Wakuta, T. Gamo
    • Organizer
      Asia Oceania Geosciences Society 2014-AOGS 11th Annual Meeting
    • Place of Presentation
      ロイトン札幌ホテル(北海道札幌市)
    • Year and Date
      2014-07-28 – 2014-08-01
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2017-05-10  

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