Reconstruction of zooplankton dynamics by using archived ADCP data

• Project/Area Number: 26450250
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: KITAMURA Minoru 国立研究開発法人海洋研究開発機構, 地球環境観測研究開発センター, 技術研究員 (00392952)
• Research Collaborator: INOUE Ryuichiro ; ITOH Motoyo ; UEKI Iwao
• Project Period (FY): 2014-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
• Keywords: 動物プランクトン / 現存量 / 長期変動 / 音響 / ADCP / 現存量変動 / 音響計測 / 北極海 / 音響解析 / 音響散乱 / 外洋 / バイオマス

Outline of Final Research Achievements

To understand responses of oceanic zooplankton communities against environmental changes, we constructed long-term zooplankton dynamics by using archived mooring ADCP data. In this study, two data sets of ADCP collected from the subtropical North Pacific and the Arctic Ocean were used.
The acoustic backscattering strengths derived from ADCP data were significantly correlated with zooplankton biomasses derived from plankton net samples in our study. So, we considered that temporal change of zooplankton biomasses can be reconstructed from long-term mooring ADCP data. Vertical distribution of subtropical zooplankton were influenced by winter mixing, stratification, passage of mesoscale eddy, and age of moon. In the Arctic Ocean, zooplankton biomasses were increased from early 2000s to early 2010s. The increasing was probably associated with decreasing of sea ice and increasing of sea surface water temperature.

Academic Significance and Societal Importance of the Research Achievements

地球温暖化やエルニーニョなど海洋環境の変化は生物群集に影響を与えるが、外洋域における生物応答の具体的な事例報告は少ない。これは継続的に得られた外洋域の生物サンプルシリーズが極めて少ないため、生物群集に現れる変化の抽出が困難なためである。本研究では、海洋物理学分野で使われる音響式流向流速計（ADCP）の長期データを利用した動物プランクトン動態の復元を行い、その有用性を明らかにした。

Research Products

• [Journal Article] Diel vertical migration of zooplankton at the S1 biogeochemical mooring revealed from acoustic backscattering strength (2016)
  • Author(s): Inoue R, Kitamura M, Fujiki T
  • Journal Title: Jornal of Geophysical Research, Oceans Volume: 121 Issue: 2 Pages: 1031-1050
  • DOI: 10.1002/2015jc011352
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 音響を用いた動物プランクトン生態研究 (2017)
  • Author(s): 喜多村稔・甘糟和男・井上龍一郎・伊東素代
  • Organizer: JpGU-AGU Joint Meeting 2017
• [Presentation] 動物プランクトンの摂餌圧推定：音響データを利用した試み (2017)
  • Author(s): 喜多村稔・伊東素代・藤原周・甘糟和男・荒功一
  • Organizer: 日本海洋学会2017年度秋季大会
• [Presentation] Diel vertical migration of zooplankton at the S1 biogeochemical mooring revealed from acoustic backscattering strength (2016)
  • Author(s): Inoue, R., M. Kitamura, T. Fujiki
  • Organizer: Ocean Science Meeting
  • Place of Presentation: ニューオリンズ、アメリカ合衆国
  • Year and Date: 2016-02-23
  • Int'l Joint Research
• [Presentation] 北極海バロー海底谷における係留ADCPを用いた少氷年と多氷年の動物プランクトン生物量の比較 (2015)
  • Author(s): 伊東素代・喜多村稔・小野寺丈尚太郎・藤原周・平譯亨・西野茂人・菊地隆
  • Organizer: 日本海洋学会2015年春季大会
  • Place of Presentation: 東京海洋大学（東京都港区）
  • Year and Date: 2015-03-22