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A New paradigm of nitrogen cycle in the marine subsurface layer controlled by trace metals

Research Project

Project/Area Number 21H03592
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
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(Kenkyū-buntansha) 塩崎 拓平  東京大学, 大気海洋研究所, 准教授 (90569849)
近藤 能子  長崎大学, 水産・環境科学総合研究科(水産), 准教授 (40722492)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2021: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Keywords海洋生態 / 窒素循環 / 微量金属 / 植物プランクトン / 硝化微生物
Outline of Research at the Start

外洋の亜表層における微量金属元素および栄養塩分布の高分解能測定とプランクトン群集の窒素代謝に関する船上培養実験を行い、微量栄養素である鉄などの化学物質の動態と光環境が、植物プランクトンからの亜硝酸塩の細胞外放出や、微生物群集による硝化作用に複合的な影響を及ぼし、亜硝酸塩極大層の形成を始めとする海洋亜表層の窒素循環を制御しているとの仮説検証に取り組む。現場の窒素循環に果たす微量栄養素の役割をより明確に理解することで、外洋域における海洋生物生産の再評価に資するとともに、地球環境変動に対する海洋生態系と物質循環の応答予測の高度化に貢献する。

Outline of Final Research Achievements

This study was undertaken to test the hypothesis that iron, copper, and zinc dynamics and light environment have a combined effect on the extracellular release of nitrite from phytoplankton and nitrification by microbial communities in the open ocean sub-surface layer, thereby controlling the formation of the nitrite maximum layer. To this end, detailed vertical distributions of nutrients, trace metals, phytoplankton, and microbial communities were examined at 20, 30, and 41°N in the western North Pacific. The results suggest that the imbalance between ammonia oxidation and nitrite oxidation by microbial communities is a major factor in nitrite accumulation in these waters. However, nitrite release from iron-deficiency stressed phytoplankton may also contribute to some extent. Consequently, it is suggested that micronutrients such as iron and the light environment play an important role in the sub-surface nitrogen cycle in the western North Pacific.

Academic Significance and Societal Importance of the Research Achievements

本研究により、亜硝酸塩極大層の形成要因を始めとする窒素循環機構について新たな知見が得られたことから、有光層内の硝化作用を含めた海洋窒素循環の理解が前進した。今後、海洋亜表層における生物窒素代謝の変動メカニズムを適切に評価することで、海洋の新生産の見積もり値が更新されて、海洋における窒素収支のアンバランスに対して新たな解釈が与えられるものと考えられる。また、グローバルな物質循環・生態系モデルに本研究で得られた成果を組み込むことによって、海洋の窒素および微量金属の循環過程と生物相互作用を精度良く再現できるようになり、地球温暖化に伴う海洋生態系の応答・変化の予測にも貢献することが期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (20 results)

All 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (10 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 9 results,  Open Access: 5 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Int'l Joint Research] プリンストン大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Findings on Marine Geochemistry of Trace Elements and Their Isotopes: Recent Achievements by GEOTRACES Project2023

    • Author(s)
      小畑元、西岡純、近藤能子、張 勁
    • Journal Title

      Chikyukagaku

      Volume: 57 Issue: 2 Pages: 35-54

    • DOI

      10.14934/chikyukagaku.57.35

    • ISSN
      0386-4073, 2188-5923
    • Year and Date
      2023-06-25
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Database of nitrification and nitrifiers in the global ocean2023

    • Author(s)
      Tang Weiyi、Ward Bess B.、Beman Michael、Bristow Laura、Clark Darren、Fawcett Sarah、Frey Claudia、Fripiat Francois、Herndl Gerhard J.、Mdutyana Mhlangabezi、Paulot Fabien、Peng Xuefeng、Santoro Alyson E.、Shiozaki Takuhei、Sintes Eva、Stock Charles、Sun Xin、Wan Xianhui S.、Xu Min N.、Zhang Yao
    • Journal Title

      Earth System Science Data

      Volume: 15 Issue: 11 Pages: 5039-5077

    • DOI

      10.5194/essd-15-5039-2023

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An aerosol odyssey: Navigating nutrient flux changes to marine ecosystems2023

    • Author(s)
      Hamilton Douglas S.、Baker Alex R.、Iwamoto Yoko、Gass Santiago、Bergas-Masso Elisa、Deutch Sarah、Dinasquet Julie、Kondo Yoshiko、Llort Joan、Myriokefalitakis Stelios、Perron Morgane M. G.、Wegmann Alex、Yoon Joo-Eun
    • Journal Title

      Elem Sci Anth

      Volume: 11 Issue: 1 Pages: 1-38

    • DOI

      10.1525/elementa.2023.00037

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Probe capture enrichment sequencing of<i>amoA</i>genes discloses diverse ammonia-oxidizing archaeal and bacterial populations2023

    • Author(s)
      Hiraoka Satoshi、Ijichi Minoru、Takeshima Hirohiko、Kumagai Yohei、Yang Ching-Chia、Makabe-Kobayashi Yoko、Fukuda Hideki、Yoshizawa Susumu、Iwasaki Wataru、Kogure Kazuhiro、Shiozaki Takuhei
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2023.04.10.536224

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Phytoplankton Distributions in the Kuroshio-Oyashio Region of the Northwest Pacific Ocean: Implications for Marine Ecology and Carbon Cycle2022

    • Author(s)
      Wang Yaoyao、Bi Rong、Zhang Jing、Gao Jiawei、Takeda Shigenobu、Kondo Yoshiko、Chen Fajin、Jin Gui’e、Sachs Julian P.、Zhao Meixun
    • Journal Title

      Frontiers in Marine Science

      Volume: 9

    • DOI

      10.3389/fmars.2022.865142

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of cyanate enrichment on growth of natural phytoplankton populations in the subtropical Pacific2022

    • Author(s)
      Sato Mitsuhide、Hashihama Fuminori、Takeda Shigenobu
    • Journal Title

      Journal of Oceanography

      Volume: 79 Issue: 1 Pages: 1-12

    • DOI

      10.1007/s10872-022-00658-1

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Relative depths of the subsurface peaks of phytoplankton abundance conserved over ocean provinces2022

    • Author(s)
      Sato Mitsuhide、Shiozaki Takuhei、Hashihama Fuminori、Kodama Taketoshi、Ogawa Hiroshi、Saito Hiroaki、Tsuda Atsushi、Takeda Shigenobu、Furuya Ken
    • Journal Title

      Limnology and Oceanography

      Volume: 67 Issue: 11 Pages: 2557-2571

    • DOI

      10.1002/lno.12222

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of iron and light on microbial nitrogen cycles in the primary nitrite maxima of the eastern Indian Ocean2022

    • Author(s)
      Sato Mitsuhide、Hirata Kunioki、Shiozaki Takuhei、Takeda Shigenobu
    • Journal Title

      Deep Sea Research Part I: Oceanographic Research Papers

      Volume: 185 Pages: 103808-103808

    • DOI

      10.1016/j.dsr.2022.103808

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distribution and chemical speciation of iron on the outer edge of the Changjiang diluted water plume of the East China Sea2022

    • Author(s)
      Sato Mitsuhide、Wakuta Yohei、Takeda Shigenobu
    • Journal Title

      Continental Shelf Research

      Volume: 234 Pages: 104646-104646

    • DOI

      10.1016/j.csr.2022.104646

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Assimilation and oxidation of urea‐derived nitrogen in the summer Arctic Ocean2021

    • Author(s)
      Shiozaki Takuhei、Hashihama Fuminori、Endo Hisashi、Ijichi Minoru、Takeda Noriko、Makabe Akiko、Fujiwara Amane、Nishino Shigeto、Harada Naomi
    • Journal Title

      Limnology and Oceanography

      Volume: 66 Issue: 12 Pages: 4159-4170

    • DOI

      10.1002/lno.11950

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] An Aerosol Odyssey: Navigating Nutrient Flux Changes to Marine Ecosystems. A contribution to the SOLAS special issue2023

    • Author(s)
      Douglas S. Hamilton, Alex R. Baker, Yoko Iwamoto, Santiago Gasso Elisa Bergas-Masso, Sarah Deutch, Julie Dinasquet, Yoshiko Kondo, Joan Llort, Stelios Myriokefalitakis, Morgane M. G. Perron, Alex Wegmann, Joo-Eun Yoon
    • Organizer
      AGU23
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 海洋における微量元素・同位体に関する国際研究GEOTRACES計画の現状と将来2023

    • Author(s)
      近藤能子, 小畑元, 西岡純, 張勁
    • Organizer
      日本地球惑星科学連合大会JpGU2023
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 北太平洋における鉄の光化学反応による形態変化2023

    • Author(s)
      近藤能子, 山中紘輝, 岩田遙貴, 砂原雄大, 西岡純, 小畑元, 武田重信
    • Organizer
      東京大学大気海洋研究所共同利用研究集会「微量元素・同位体を用いた海洋生物地球化学研究 (GEOTRACES-Japan)」
    • Related Report
      2022 Annual Research Report
  • [Presentation] 主要な窒素消費者としての窒素固定性シアノバクテリア2022

    • Author(s)
      増田貴子, 井之村啓介, 児玉武稔, 塩崎拓平, 北島聡, Gabrielle Armin, 松井貴人, 鈴木光次, 武田重信, 佐藤光秀, Ondrej Prasil, 古谷研
    • Organizer
      日本海洋学会2022年度秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Biogeochemical characterization of the primary nitrite maxima in the eastern Indian Ocean and the effects of iron on subsurface nitrogen cycle2022

    • Author(s)
      Shigenobu Takeda, Kunioki Hirata, Takuhei Shiozaki, Mitsuhide Sato
    • Organizer
      Ocean Sciences Meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Photodecomposition of humic substances and organic iron-binding ligands from natural seawater2022

    • Author(s)
      Mitsuhide Sato, Natsuki Ogata, Shigenobu Takeda
    • Organizer
      Ocean Sciences Meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nitrogen cycling in the primary nitrite maximum of the Indian Ocean2021

    • Author(s)
      Shigenobu Takeda, Kunioki Hirata, Takuhei Shiozaki
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 東シナ海大陸棚・大陸斜面上における溶存鉄濃度と化学形態2021

    • Author(s)
      佐藤 光秀, 涌田 陽平, 武田 重信
    • Organizer
      日本海洋学会2021年度秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Distribution and chemical speciation of iron on the outer edge of the Changjiang diluted water plume of the East China Sea2021

    • Author(s)
      Mitsuhide Sato, Yohei Wakuta, Shigenobu Takeda
    • Organizer
      PICES-2021 Virtual Annual Meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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