Change in lower trophic ecosystem and its complex mechanism in the North Pacific

2019 Fiscal Year Annual Research Report

• Project Area: Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem
• Project/Area Number: 15H05822
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: 原田 尚美 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), センター長 (70344281)
• Co-Investigator(Kenkyū-buntansha): 本多 牧生 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 上席技術研究員 (20359160) ; 三野 義尚 名古屋大学, 宇宙地球環境研究所, 助教 (20362303) ; 藤木 徹一 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), 主任技術研究員 (30598248) ; 桑田 晃 国立研究開発法人水産研究・教育機構, 東北区水産研究所, グループ長 (40371794) ; 田所 和明 国立研究開発法人水産研究・教育機構, 東北区水産研究所, 主幹研究員 (70399575) ; 相田 真希 国立研究開発法人海洋研究開発機構, 地球環境部門(地球表層システム研究センター), グループリーダー代理 (90463091)
• Project Period (FY): 2015-06-29 – 2020-03-31
• Keywords: 海洋生態系 / セジメントトラップ / 乱流 / 栄養塩フラックス / 有機炭素フラックス

Outline of Annual Research Achievements

本計画班では、生物生産のホットスポットである北西部北太平洋において生物生産量や低次生物群集の時系列変化の把握と物理化学環境との関係性を季節などの短期から10年規模の長期にわたって明らかにすることが役割となっている。今年度は生物生産の長期的変動とその要因について12から19年にわたって北太平洋亜寒帯域(St.K2, St.SA, St.AB)の西部から中央部およびベーリング海で採取された時系列有機炭素や円石藻および珪藻バイオマーカー、オパールなどの各種フラックスデータとCommunity地球システムモデル(CESM)、全球海洋生態系モデル(COCO4.9-NEMURO)と合わせて解析を行った。St.SAとSt.ABで観測された円石藻と珪藻のバイオマーカーフラックス比（亜熱帯と亜寒帯の群集組成比でどちらの水塊が卓越していたかの指標として用いる）の時系列データは、PDOやENSOの周期などに連動して変化し、PDOが正の位相の時や強いENSOシグナルの1997年や2006年に、相対的に円石藻/珪藻バイオマーカー比が増加し、亜寒帯群集に比べて亜熱帯群集が増加することがわかった。CESMモデルの解析によると、PDOは中央部北太平洋で栄養塩や植物プランクトンに経年変動をもたらし、PDOが正の位相の時に、増加した栄養塩が亜寒帯ジャイアに沿って東へ１ー２年かけて伝搬することがわかった。さらに全球海洋生態系モデルの解析によると、PDOのような長周期の気候イベントによる基礎生産の応答は海域によって影響の出方は異なるが、北西部St.K2周辺では、PDOが水温や植物・動物プランクトンの現存量に影響を及ぼしている結果が得られた。以上のことから、北太平洋ではPDOのような長周期気候変動が水温や栄養塩環境を介し海域によっては１ー２年の時間差をもって基礎生産に強く影響を及ぼしていることがわかった。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Seasonal and interannual variations in nitrogen availability and particle export in the northwestern North Pacific subtropical gyre (2020)
  • Author(s): Mino Y., Sukigara C., Honda M. C. , Kawakami H., Wakita M., Sasaoka K., Yoshikawa C., Abe O., Kaiser J., Kimoto K., Kitamura M., Fujiki T., Matsumoto K., Saino T.
  • Journal Title: Journal of Geophysical Research: Oceans Volume: なし
  • DOI: 10.1029/2019JC015600
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids (2020)
  • Author(s): Matsubayashi J., Osada Y., Tadokoro K., Abe Y., Yamaguchi A., Shirai K., Honda K., Yoshikawa C., Ogawa N. O., Ohkouchi N., Ishikawa N. F., Nagata T., Miyamoto H., Nishino S., Tayasu I.
  • Journal Title: Ecology Letters Volume: なし
  • DOI: 10.1111/ele.13496
  • Peer Reviewed / Open Access
• [Journal Article] Response of N2O production rate to ocean acidification in the western North Pacific (2019)
  • Author(s): Breider F., Yoshikawa C., Makabe A., Toyoda S., Wakita M., Matsui Y., Kawagucci S., Fujiki T., Harada N., Yoshida N.
  • Journal Title: Nature Climate Change Volume: 9 Pages: 954～958
  • DOI: 10.1038/s41558-019-0605-7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system (2019)
  • Author(s): Fujiki T., Inoue R., Honda M.C., Wakita M., Mino Y., Sukigara C., Abe O.
  • Journal Title: Limnology and Oceanography Volume: なし
  • DOI: 10.1002/lno.11372
  • Peer Reviewed / Open Access
• [Journal Article] Phaeodaria: An Important Carrier of Particulate Organic Carbon in the Mesopelagic Twilight Zone of the North Pacific Ocean (2019)
  • Author(s): Ikenoue T., Kimoto K., Okazaki Y., Sato M., Honda M. C., Takahashi K., Harada N., Fujiki T.
  • Journal Title: Global Biogeochemical Cycles Volume: 33 Pages: 1146～1160
  • DOI: 10.1029/2019GB006258
  • Peer Reviewed
• [Journal Article] Influence of Coastal Oyashio water on massive spring diatom blooms in the Oyashio area of the North Pacific Ocean (2019)
  • Author(s): Kuroda H., Toya Y., Watanabe T., Nishioka J., Hasegawa D., Taniuchi Y., Kuwata A.
  • Journal Title: Progress in Oceanography Volume: 175 Pages: 328～344
  • DOI: 10.1016/j.pocean.2019.05.004
  • Peer Reviewed
• [Journal Article] On the Future of Argo: A Global, Full-Depth, Multi-Disciplinary Array (2019)
  • Author(s): Roemmich D., Alford M.H., Claustre H., Johnson K., King B., Moum J., Oke P., Owens B., Pouliquen S., Purkey S., Scanderbeg M., Suga T., Wijffels S., Zilberman N., Bakker D., Baringer M., Fujiki T., Hibiya T., Hosoda S., Yasuda I. ほか57名
  • Journal Title: Frontiers in Marine Science Volume: 6
  • DOI: 10.3389/fmars.2019.00439
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Eukaryotic Phytoplankton Contributing to a Seasonal Bloom and Carbon Export Revealed by Tracking Sequence Variants in the Western North Pacific (2019)
  • Author(s): Shiozaki T., Hirose Y., Hamasaki K., Kaneko R., Ishikawa K., Harada N.
  • Journal Title: Frontiers in Microbiology Volume: 10
  • DOI: 10.3389/fmicb.2019.02722
  • Peer Reviewed / Open Access
• [Journal Article] Sinking dynamics of particulate matter in the subarctic and subtropical regions of the western North Pacific (2019)
  • Author(s): Sukigara C., Mino Y., Kawakami H., Honda M. C.、Fujiki T., Matsumoto K., Wakita M., Saino T.
  • Journal Title: Deep Sea Research Part I: Oceanographic Research Papers Volume: 144 Pages: 17～27
  • DOI: 10.1016/j.dsr.2018.11.004
• [Journal Article] Depth-dependent transcriptomic response of diatoms during spring bloom in the western subarctic Pacific Ocean (2019)
  • Author(s): Suzuki S., Kataoka T., Watanabe T., Yamaguchi H., Kuwata A., Kawachi M.
  • Journal Title: Scientific Reports Volume: 9
  • DOI: 10.1038/s41598-019-51150-8
  • Peer Reviewed / Open Access
• [Journal Article] Fertilization of the Northwest Pacific Ocean by East Asia Air Pollutants (2019)
  • Author(s): Zhang C., Ito A., Shi Z., Aita Noguchi M., Yao X., Chu Q., Shi J., Gong X., Gao H.
  • Journal Title: Global Biogeochemical Cycles Volume: 33 Pages: 690～702
  • DOI: 10.1029/2018GB006146
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dietary overlap and optimal prey environments of larval and juvenile sardine and anchovy in the mixed water region of the western North Pacific (2019)
  • Author(s): Okazaki Y., Tadokoro K., Kubota H., Kamimura Y., Hidaka K.
  • Journal Title: Marine Ecology Progress Series Volume: 630 Pages: 149～160
  • DOI: 10.3354/meps13124
  • Peer Reviewed / Open Access
• [Journal Article] 無縦溝珪藻 Diatoma mesodon Kutzing（Fragilariaceae, Fragilariales）の唇状突起形成 (2019)
  • Author(s): 渡辺 剛、南雲 保、田中 次郎、田所 和明
  • Journal Title: Diatom Volume: 35 Pages: 75～77
  • DOI: 10.11464/diatom.35.75
  • Peer Reviewed
• [Presentation] Impacts of interdecadal climate variability and vertical mixing on biological production (2020)
  • Author(s): Aita M.N., Komuro Y., Tadokoro K., Tatebe H., Fujiki T., Watanabe T., Hashioka T. and Harada N.
  • Organizer: Ocean Sciences Meeting 2020
  • Int'l Joint Research
• [Presentation] Time-series observations of primary production in the subtropical western North Pacific by an underwater profiling buoy system: relationship between GOP and dissolved oxygen. (2020)
  • Author(s): Fujiki T., Inoue R., Honda M. C., Wakita M., Sukigara C., Mino Y., Abe O.
  • Organizer: Ocean Sciences Meeting 2020
  • Int'l Joint Research
• [Presentation] Decadal variation of biological settling particle fluxes controlled by physical process in the subarctic western North Pacific (2020)
  • Author(s): Harada N., Ueno H., Fujita I., Matsudera N., Onodera J., Honda M.C., Aita M.N., Fujiki T., Kitamura M., Sato M.
  • Organizer: Ocean Sciences Meeting 2020
  • Int'l Joint Research
• [Presentation] Comparison of POC flux vertical attenuation between the subarctic and subtropical regions in the western North Pacific (2020)
  • Author(s): Honda M.C.
  • Organizer: Ocean Sciences Meeting 2020
  • Int'l Joint Research
• [Presentation] Seasonal transition of the dominant nitrogen source for phytoplankton reconstructed by determining the nitrogen isotope composition for nitrate, ammonium, and individual amino acids of sinking particles in the Northwestern Pacific (2020)
  • Author(s): Yoshikawa C., Ogawa N. O., Chikaraishi Y., Makabe A., Matsui Y., Sasai Y., Wakita M., Honda M. C., Mino Y., Aita M. N., Fujiki T., Nunoura T., Harada N., Ohkouchi N.
  • Organizer: Ocean Sciences Meeting 2020
  • Int'l Joint Research
• [Presentation] Importance of Biogenic Opal in the Biological Pump (2019)
  • Author(s): Honda M.C.
  • Organizer: Goldschmidt Conference 2019
  • Int'l Joint Research / Invited
• [Presentation] Change in lower trophic level ecosystem and its complex mechanism in the North Pacific (2019)
  • Author(s): Harada N., Fujiki T., Aita M., Honda M.C., Kitamura M., Shiozaki T., Mino Y., Kuwata A., Tadokoro K., Seki O., Chikamoto M.
  • Organizer: Japan Geoscience Union 2019
  • Int'l Joint Research / Invited
• [Presentation] Impacts of decadal-scale climate variability on marine ecosystems (2019)
  • Author(s): Aita M.N., Fujiki T., Tadokoro K., Komuro Y., Taketani F., Harada N.
  • Organizer: OCEAN OBS’19
  • Int'l Joint Research
• [Presentation] Response of lower trophic level ecosystems to decadal scale variation of climate system in the North Pacific Ocean (2019)
  • Author(s): Aita M.N., Tadokoro K., Kuwata A., Komuro Y., Hashioka T., Harada N.
  • Organizer: IMBeR Future Oceans 2
  • Int'l Joint Research
• [Presentation] Change in lower trophic level ecosystems to decadal scale variation of climate system in the North Pacific Ocean (2019)
  • Author(s): Aita M.N, Tadokoro K., Komuro Y., Hashioka T., Harada N.
  • Organizer: 3rd International Symposium “Ocean Mixing Processes: Impact on biogeochemistry, climate and ecosystem”
  • Int'l Joint Research
• [Presentation] Change in lower trophic level ecosystems to decadal scale variation of climate system in the North Pacific Ocean (2019)
  • Author(s): Aita M.N, Tadokoro K., Komuro Y., Hashioka T., Harada N.
  • Organizer: Japan Geoscience Union 2019
  • Int'l Joint Research
• [Presentation] Time-series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system (2019)
  • Author(s): Fujiki T., Inoue R., Honda M. C., Wakita M., Sukigara C., Mino Y., Abe O.
  • Organizer: 3rd International Symposium “Ocean Mixing Processes: Impact on biogeochemistry, climate and ecosystem”
  • Int'l Joint Research
• [Presentation] Monitoring of Phytoplankton Blooms in the Western Subarctic Pacific by Autonomous Ocean Observation Platforms (2019)
  • Author(s): Fujiki T., Hododa S., Harada N.
  • Organizer: Asia Oceania Geoscience Society 16th Annual Meeting
  • Int'l Joint Research
• [Presentation] Biogeochemical research in the western subarctic North Pacific by the mooring and float systems (2019)
  • Author(s): Fujiki T., Hododa S., Sato K., Harada N.
  • Organizer: OCEAN OBS’19
  • Int'l Joint Research
• [Presentation] Characteristics of transportation effect of biogenic particles associated with the different mixing pattern in the western North Pacific (2019)
  • Author(s): Harada N., Fujiki T., Aita M. N., Honda M. C., Kitamura M., Shiozaki T., Mino Y. Kuwata A., Tadokoro K., Seki O., Chikamoto M.
  • Organizer: 3rd International Symposium “Ocean Mixing Processes: Impact on biogeochemistry, climate and ecosystem”
  • Int'l Joint Research
• [Presentation] A challenge on measuring photosynthetic oxygen evolution by optical sensors in the Tokyo Bay, off Haneda (2019)
  • Author(s): Miyazaki N., Sukigara C., Choque K. L., Hamana I., Mino Y., Morimoto A.
  • Organizer: International symposium on coastal ecosystem change in Asia: hypoxia, eutrophication, and nutrient conditions
  • Int'l Joint Research
• [Presentation] Hypoxia in the Upper Gulf of Thailand-Hydrographic observation and modeling (2019)
  • Author(s): Morimoto A., Mino Y., Buranapratheprat A., Kaneda A., Tong-U-Dom S., Guo X.
  • Organizer: International symposium on coastal ecosystem change in Asia: hypoxia, eutrophication, and nutrient conditions
  • Int'l Joint Research
• [Presentation] Oxygen consumption rate in the Mikawa Bay using an optical oxygen sensor (2019)
  • Author(s): Sukigara C., Mino Y., Yasuda A., Morimoto A., Ishizaka J.
  • Organizer: International symposium on coastal ecosystem change in Asia: hypoxia, eutrophication, and nutrient conditions
  • Int'l Joint Research
• [Presentation] Seasonal and interannual variation of mesozooplankton community structure in the Oyashio and Kuroshio-Oyashio Transition waters, western North Pacific (2019)
  • Author(s): Tadokoro, K., Okazaki Y., Kasai H.
  • Organizer: IMBeR Future Oceans 2
  • Int'l Joint Research
• [Presentation] Modelling study for response of marine ecosystem in northwestern Pacific Ocean by deposition of atmospheric inorganic nitrogen compounds produced in East Asia (2019)
  • Author(s): Taketani F., Aita M.N., Yamaji K., Sekiya T., Ikeda K., Sasaoka K., Hashioka T., Honda M.C., Matsumoto K., Kanaya Y.
  • Organizer: SOLAS open science conference 2019
  • Int'l Joint Research
• [Presentation] 親潮、黒潮親潮混合域および黒潮におけるメソ動物プランクトンの群集構造の地理的・季節的変動 (2019)
  • Author(s): 田所和明・岡崎雄二・葛西広海
  • Organizer: 日本海洋学会 海洋生物シンポジウム