Evaluation of the mechanisms underlying carbon cycles mediated by microbial food web networks in meso- and bathypelagic layers of the oceans

• Project/Area Number: 24241003
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Tokyo
• Principal Investigator: NAGATA Toshi 東京大学, 大気海洋研究所, 教授 (40183892)
• Co-Investigator(Kenkyū-buntansha): YOKOKAWA Taichi 愛媛大学, 沿岸環境科学研究センター, 講師 (00402751) ; FUKUDA Hideki 東京大学, 大気海洋研究所, 所教 (30451892) ; HASUMI Hiroyasu 東京大学, 大気海洋研究所, 教授 (40311641) ; OGAWA Hiroshi 東京大学, 大気海洋研究所, 准教授 (50260518)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥45,240,000 (Direct Cost: ¥34,800,000、Indirect Cost: ¥10,440,000); Fiscal Year 2014: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000); Fiscal Year 2013: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000); Fiscal Year 2012: ¥26,130,000 (Direct Cost: ¥20,100,000、Indirect Cost: ¥6,030,000)
• Keywords: 海洋生態系 / 中深層 / 微生物食物網 / 炭素循環 / 原核生物 / 原生生物 / ウィルス / 海洋生態系モデリング / 海洋 / 炭素鉛直輸送

Outline of Final Research Achievements

This project conducted an interdisciplinary study combining field observations and modelling in order to explore previously overlooked mechanisms by which carbon cycles are controlled by microbial foodweb networks in meso-and bathypelagic environments of the oceans. It was revealed that microbial food web structure systematically changes over the depth. Furthermore, quantitative estimates of material fluxes driven by microbial interactions were provided by a means of the sensitivity analysis using a three-dimentional general circulation model combined with a biogeochmical model that explicitly resolved microbial interactions.

Research Products

• [Journal Article] Influence of nitrogen substrates and substrate C:N ratios on the nitrogen isotopic composition of amino acids from the marine bacterium Vibrio harveyi (2014)
  • Author(s): Maki, K., N. Ohkouchi, Y. Chikaraishi, H. Fukuda, T. Miyajima, and T. Nagata
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 140 Pages: 521-530
  • DOI: 10.1016/j.gca.2014.05.052
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Modelling the global cycle of marine dissolved organic matter and its influence on marine productivity (2014)
  • Author(s): Hasumi, Y. and T. Nagata
  • Journal Title: Ecological Modelling Volume: 288 Pages: 9-24
  • DOI: 10.1016/j.ecolmodel.2014.05.009
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Large-scale distribution of viruses in deep waters of the Pacific and Souther Oceans (2014)
  • Author(s): Yang, Y., Yokokawa, T., Motegi, C., and Nagata, T.
  • Journal Title: Aquatic Microbial Ecology Volume: 71 Pages: 193-202
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Effects of attached bacteria on organic aggregate settling velocity in seawater. (2013)
  • Author(s): Yamada, Y., Fukuda, H., Inoue, K., Kogure, K., and Nagata, T.
  • Journal Title: Aquatic Microbial Ecology Volume: 70 Issue: 3 Pages: 261-272
  • DOI: 10.3354/ame01658
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Large-scale geographical variation in prokaryote abundance and production in meso- and bathypelagic zones of the central Pacific and Southern Oceawn (2013)
  • Author(s): Yokokawa, T.
  • Journal Title: Limnology and Oceanography Volume: 58 Issue: 1 Pages: 61-73
  • DOI: 10.4319/lo.2013.58.1.0061
  • Peer Reviewed
• [Journal Article] Vertical distribution of prokaryote production and abundance in the mesopelagic and bathypelagic layers of the Canada Basin, western Arctic:Implications for the mode and extent of organic carbon delivery. (2013)
  • Author(s): Uchimiya M., H. Fukuda, S. Nishino, T. Kikuchi, H. Ogawa, T. Nagata.
  • Journal Title: Deep-Sea Research Part I Volume: 71 Pages: 103-112
  • DOI: 10.1016/j.dsr.2012.10.001
  • Peer Reviewed
• [Presentation] Spatiotemporal dynamics of planktonic archaea in the western North Pacific Ocean (2015)
  • Author(s): Kaneko, R., S. Suzuki, T. Nagata, M. Honda and K. Hamasaki
  • Organizer: ASLO 2015 Aquatic Sciences Meeting
  • Place of Presentation: Granada, Spain
  • Year and Date: 2015-02-23
• [Presentation] Bacterial enhancement of microgel coagulation in seawater (2015)
  • Author(s): Yamada, Y., H. Fukuda, Y. Tada, K. Kogure, T. Nagata
  • Organizer: ASLO 2015 Aquatic Sciences Meeting
  • Place of Presentation: Granada, Spain
  • Year and Date: 2015-02-23
• [Presentation] Atmospheric forcing resulted in enhanced microbial production in the water column of the Chukchi Shelf, western Arctic, in early autumn (2014)
  • Author(s): Uchimiya M., Motegi C., Kawaguchi Y., Inoue J., Nishino S., Ogawa H., Nagata T
  • Organizer: IMBER Open Science Conference
  • Place of Presentation: Bergen, Norway
  • Year and Date: 2014-06-25
• [Presentation] 西部北極海における微生物群集・有機物の空間変動およびその支配機構 (2014)
  • Author(s): 内宮 万里央・茂手木 千晶・山田 洋輔・楊 燕輝・福田 秀樹・永田 俊
  • Organizer: 201３年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学、東京都
  • Year and Date: 2014-03-30
• [Presentation] 微生物の物質循環への役割 (2014)
  • Author(s): 内宮 万里央・永田 俊
  • Organizer: 201３年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学、東京都
  • Year and Date: 2014-03-30
• [Presentation] Temporal variability in heterotrophic prokaryote production in the dark ocean (2014)
  • Author(s): Uchimiya M., Fukuda H., Ogawa H, Wakita M., Honda, M, Nagata T.
  • Organizer: 2014 ASLO Ocean Sciences Meeting
  • Place of Presentation: Honolulu, U.S.A
  • Year and Date: 2014-02-28
• [Presentation] 細菌による大型有機凝集物 (マリンスノー) の形成促進要因 (2013)
  • Author(s): 山田 洋輔・福田 秀樹・永田 俊
  • Organizer: 日本海洋学会秋季大会
  • Place of Presentation: 北海道大学学術交流会館、札幌市
  • Year and Date: 2013-09-20
• [Presentation] Embedding microbial foodwebs into ocean biogeochemical models: challenges towards a global synthesis (2013)
  • Author(s): T. Nagata
  • Organizer: EMBO Conference on Aquatic Microbial Ecology: SAME13
  • Place of Presentation: Stresa, Italy
  • Year and Date: 2013-09-09
  • Invited
• [Presentation] Embedding microbial food webs to ocean biogeochemical models: a global synthesis
  • Author(s): Nagata, T.
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: 滋賀県立びわ湖ホール 滋賀県
  • Invited
• [Presentation] Viral gradient along the meridional overturning circulation.
  • Author(s): Yang, Y.
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: 滋賀県立びわ湖ホール 滋賀県
• [Presentation] Attached bacteria reduce settling velocity of organic aggregates in seawater
  • Author(s): Yamada, Y
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: 滋賀県立びわ湖ホール 滋賀県
• [Presentation] Viral hot spot in the upper layer of the western North Pacific
  • Author(s): Motegi, C
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: 滋賀県立びわ湖ホール 滋賀県
• [Presentation] Large-scale geographical variation in prokaryotic abundance and production in meso-and bathypelagic zones of the central Pacific and the Southern Ocean
  • Author(s): Yokokawa, T.
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: 滋賀県立びわ湖ホール 滋賀県
• [Presentation] Low production and low turnover of heterotrophic microbes in the deep water of the Canada Basin, western Arctic
  • Author(s): Ucihmiya, M.
  • Organizer: 2013 ASLO Aquatic Sciences Meeting
  • Place of Presentation: New Orleans, U.S.A.
• [Presentation] 北極海における微生物の生産
  • Author(s): 永田俊
  • Organizer: 2013年度日本海洋学会春季大会シンポジウム
  • Place of Presentation: 東京海洋大学品川キャンパス 東京
• [Presentation] 西部北太平洋亜寒帯・亜熱帯海域中深層における原核生物生産速度および生物量の季節変動
  • Author(s): 内宮万里央
  • Organizer: 2013年度日本海洋学会春季大会シンポジウム
  • Place of Presentation: 東京海洋大学品川キャンパス 東京
• [Presentation] 西部北極海中深層における原核生物生産速度の全深度分布：有機炭素供給パターンとその強度の評価
  • Author(s): 内宮万里央
  • Organizer: 2013年度日本海洋学会春季大会一般講演
  • Place of Presentation: 東京海洋大学品川キャンパス 東京
• [Remarks] 全深度微生物分布データベース（FddMAP)
  • URL: http://157.82.133.122/~database/FddMAP/FddMAP_JP.html
• [Remarks] 全深度微生物分布データベース（FddMAP)
  • URL: http://157.82.133.112/~database/FddMAP/FddMAP_JP.html
• [Remarks] 生元素動態研究室
  • URL: http://co.aori.u-tokyo.ac.jp/mbcg/j/members/nagata/