In situ measurement of dark carbon fixation at the deep-sea floor and its importances in the deep-sea benthic ecosystem

• Project/Area Number: 24540504
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: NOMAKI Hidetaka 独立行政法人海洋研究開発機構, 生物地球化学研究分野, 主任研究員 (90435834)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 深海生態系 / 物質循環 / 炭酸固定 / 現場培養実験 / 同位体トレーサー

Outline of Final Research Achievements

We investigated on the importance of chemolithoautotrophic carbon production at the deep-sea floor by performing in situ incubation experiments. The measured carbon fixation rates varied greatly among experimental sites. The carbon fixation rates were not correlated with the abundances of some prokaryotes which are expected to contribute carbon fixation at the deep-sea floor. The highest carbon fixation rate measured at bathyal Sagami Bay corresponded to 1 to 2 % of phytodetritus input rate to the seafloor. Considering the fact that sinking organic matters in the deep-sea mostly consist of refractory organic matter, the organic matter produced by chemolithoautotrophic microbes plays substantial roles in the deep-sea benthic ecosystems at Sagami Bay.

Research Products

• [Journal Article] Nitrate uptake by foraminifera and use in conjunction with endobionts under anoxic conditions (2014)
  • Author(s): Nomaki, H., Chikaraishi, Y., Tsuchiya, M., Toyofuku, T., Ohkouchi, N., Uematsu, K., Tame, A., Kitazato, H.
  • Journal Title: Limnology & Oceanography Volume: 59 Issue: 6 Pages: 1879-1888
  • DOI: 10.4319/lo.2014.59.6.1879
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Nematode community composition in hydrothermal vent and adjacent non-vent fields around Myojin Knoll, a seamount on the Izu-Ogasawara Arc in the western North Pacific Ocean (2014)
  • Author(s): Setoguchi, Y., Nomaki, H., Kitahashi, T., Watanabe, H., Inoue, K., Ogawa, NO, Shimanaga, M.
  • Journal Title: Mar. Biol Volume: (in press) Issue: 8 Pages: 1775-1785
  • DOI: 10.1007/s00227-014-2460-4
  • Peer Reviewed
• [Journal Article] Genetic diversity and environmental preferences of monothalamous foraminifers revealed through clone analysis of environmental small-subunit ribosomal DNA sequences (2013)
  • Author(s): Tsuchiya M, Gooday AJ, Nomaki H, Oguri K, Kitazato H
  • Journal Title: Journal of Foraminiferal Research Volume: 43 Pages: 3-13
• [Journal Article] Low bacterial diversity and high labile organic matter concentrations in the sediments of the Medee deep-sea hypersaline anoxic basin (2012)
  • Author(s): Akoumianaki I, Nomaki H, Pachiadaki M, Kormas KA, Kitazato H, Tokuyama H
  • Journal Title: Microbes and Environments Volume: 27 Pages: 504-508
  • NAID: 10031125951
• [Presentation] Multiple food sources and trophic position of a bathyal benthic ecosystem as revealed by nitrogen isotopic composition of amino acids (2015)
  • Author(s): Nomaki H, Chikaraishi Y, Ogawa NO, Shimanaga M, Tsuchiya M, Suga H, Toyofuku T, Ohkouchi N
  • Organizer: 14th Deep-Sea Biology Symposium
  • Place of Presentation: アヴェイロ、ポルトガル
  • Year and Date: 2015-08-31 – 2015-09-04
• [Presentation] Feeding preferences of abyssal macrofauna inferred from in situ pulse chase experiments in the West Pacific (2015)
  • Author(s): Alves A, Ramos S, Hidetaka Nomaki, Amaro T
  • Organizer: 14th Deep-Sea Biology Symposium
  • Place of Presentation: アヴェイロ、ポルトガル
  • Year and Date: 2015-08-31 – 2015-09-04
• [Presentation] 深海平原は沈降有機物フラックスが支配する世界なのかを検証する西太平洋縦断調査＆実験―YK13-09,YK13-12航海概要―
  • Author(s): 野牧秀隆・布浦拓郎・土屋正史・宮本教生・清家弘治・上島優貴・嶋永元裕・Teresa Amaro ・Eugenio Rastelli・Bruna Petani・Michael Tangherlini
  • Organizer: ブルーアースシンポジウム2014
  • Place of Presentation: 東京海洋大学、東京都
• [Presentation] 嫌気環境下における底生有孔虫細胞内での脱窒と微生物の関与
  • Author(s): 野牧秀隆・力石嘉人・土屋正史・豊福高志・大河内直彦・植松勝之・多米晃裕・北里洋
  • Organizer: 日本古生物学会2013年年会
  • Place of Presentation: 熊本大学、熊本県
• [Presentation] 2011年東北地方太平洋沖地震が深海生態系に及ぼした影響
  • Author(s): 野牧秀隆・新井和乃・布浦拓郎・豊福高志・渡邉修一・高井研・藤倉克則
  • Organizer: 日本地質学会第120年学術大会
  • Place of Presentation: 東北大学、宮城県
  • Invited
• [Presentation] In situ experimental measurements of carbon fixation on the deep-sea floor
  • Author(s): Nomaki H, Inoue K, Suga H, Nunoura N, Tsuchiya M, Toyofuku T, Kitazato H
  • Organizer: 13th Deep-Sea Biology Symposium
  • Place of Presentation: Wellington, NZ
• [Presentation] Nitrate utilization in shallow-water benthic foraminiferal cells under anoxic environments revealed by 15N-labelling experiments
  • Author(s): Nomaki H, Chikaraishi Y, Tsuchiya M, Toyofuku T, Ohkouchi N, Kitazato H
  • Organizer: 2012 ASLO Aquatic Sciences Meeting
  • Place of Presentation: Ohtsu
• [Presentation] Different utilization of nitrate nitrogen in shallow-water benthic foraminiferal cells under oxic/anoxic conditions
  • Author(s): H Nomaki, Y Chikaraishi, M Tsuchiya, T Toyofuku, N Ohkouchi, and H Kitazato
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 幕張
• [Presentation] 底生有孔虫による硝酸態窒素利用の好気・嫌気飼育実験による解明
  • Author(s): 野牧秀隆、力石 嘉人、土屋 正史、豊福 高志、大河内直彦、北里洋
  • Organizer: 2012年度MRC 研究集会
  • Place of Presentation: つくば
• [Presentation] 有孔虫による硝酸塩呼吸のアミノ酸窒素同位体比への記録
  • Author(s): 野牧秀隆、力石嘉人、土屋正史、豊福高志、大河内直彦、北里洋
  • Organizer: 2012年度古海洋学シンポジウム
  • Place of Presentation: 柏
• [Presentation] さまざまな深海環境における化学合成一次生産量の現場測定と生態系での役割
  • Author(s): 野牧秀隆、井上健太郎、菅寿美、布浦拓郎、土屋正史、豊福高志、北里洋
  • Organizer: 日本古生物学会第162回例会
  • Place of Presentation: 横浜国立大学
• [Remarks]
  • URL: http://www.jamstec.go.jp/res/ress/nomakih/