• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Monitoring observation aimed at elucidating of a new phenomena in the phytoplankton community dynamics using the optical measurement methods

Research Project

Project/Area Number 19K12311
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionThe University of Shiga Prefecture

Principal Investigator

GOTO Naoshige  滋賀県立大学, 環境科学部, 教授 (40336722)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords植物プランクトン / 一次生産 / 栄養塩 / 琵琶湖 / 群集動態 / モニタリング / 光学的測定
Outline of Research at the Start

植物プランクトン群集の動態を詳細に評価するためには、その現存量、種組成、光合成活性の3つの因子を広域・高解像度で、かつ同時に知る必要がある。そこで本研究では、複数の光学的測定法を組み合わせて、本研究の対象水域である琵琶湖北湖における植物プランクトン群集動態のモニタリング観測を実施する。これらの観測結果を各環境因子や気象イベント,人間活動などの影響を含めて詳細に解析することで、琵琶湖北湖における植物プランクトン群集の新たな動態像を示す。

Outline of Final Research Achievements

It is clarified by mooring, ship and satellite observation that community dynamics of phytoplankton (biomass, species composition, primary production) was greatly affected by a meteorological phenomena each year in the north basin of Lake Biwa. In particularly, strengthening and lengthening in the stratification, which is thought to be caused by global warming, decreases the supply of nutrients from deep layer to surface layer, resulting the fall phytoplankton bloom has become smaller compared with other year. In addition, the supply of nutrients from the inside and outside of Lake Biwa is almost cut off when the strengthened and lengthened stratification together with a decrease in precipitation. These phenomena caused the dominance of smaller-celled phytoplankton in Lake Biwa. Optical measurement methods that enable high-resolution spatiotemporal observation are expected to continue to show a new community dynamics of phytoplankton in Lake Biwa.

Academic Significance and Societal Importance of the Research Achievements

本研究では、温暖化に起因する水循環の停滞が、栄養塩動態の変化を介して、琵琶湖北湖の植物プランクトン群集に大きく影響することを示した。温暖化の進行は、琵琶湖における大型植物プランクトンの秋季ブルームを消失させ、一次生産力の低下を引き起こす可能性がある。これらの研究成果は、今後の温暖化に対する湖沼生態系の応答や保全・修復を考える上で重要な知見である。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2021 2020 2019

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effect of dissolved oxygen on nitrogen and phosphorus fluxes from lake sediments and their thresholds based on incubation using a simple and stable dissolved oxygen control method2021

    • Author(s)
      Osaka Ken'ichi, Yokoyama Rei, Ishibashi Takaaki, Goto Naoshige
    • Journal Title

      Limnology and Oceanography: Methods

      Volume: 20 Issue: 1 Pages: 1-14

    • DOI

      10.1002/lom3.10466

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 琵琶湖における水質管理のあり方に関する研究と課題2020

    • Author(s)
      早川和秀,佐藤祐一,岡本高弘,永田貴丸,後藤直成,冨岡典子,中野伸一
    • Journal Title

      地球環境

      Volume: 25

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 琵琶湖北湖における植物プランクトン群集動態2021

    • Author(s)
      後藤直成,伴修平
    • Organizer
      日本陸水学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 冬期全循環停止がおきた琵琶湖における貧酸素水塊の広域観測2021

    • Author(s)
      石川俊之,合田幸子,赤塚徹志,後藤直成
    • Organizer
      日本陸水学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Monitoring and particle-tracking simulation to clarify littoral-to-pelagic nutrient export in Lake Biwa, Japan, during the spring rice-planting season2021

    • Author(s)
      Wells John, Syuhei Ban, Xin Liu, Ken'ichi Osaka, Naoshige Goto
    • Organizer
      35th Congress of the International Society of Limnology
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High resolution monitoring for subsidiary nutrient loadings and phytoplankton production in north basin of Lake Biwa.2021

    • Author(s)
      Syuhei Ban, Xin Liu, Ken-ichi Osaka, Naoshige Goto, John C. Wells
    • Organizer
      Japan Geoscience Union Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of disturbance events on primary production in the northern basin of Lake Biwa2020

    • Author(s)
      Goto, N., M. Iwaki, S. Ban, K. Hayakawa
    • Organizer
      JpGU-AGU Joint meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] Did artificial re-oligotrophication induce a reduction of fish catch in Lake Biwa?2020

    • Author(s)
      Ban, S., X. Liu, M. Maruo, N. Goto, K. Osaka, S. Onodera, M. Saito, T. Ishida, N. Okuda
    • Organizer
      JpGU-AGU Joint meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] 高解像度光学観測衛星「しきさい(SGLI)」を用いた湖沼における水質モニタリングの可能性2019

    • Author(s)
      塚本浩貴,林正能,石坂丞二,後藤直成
    • Organizer
      海洋理工学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 衛星データを用いた琵琶湖北湖におけるクロロフィルa濃度分布2019

    • Author(s)
      大賀雄介,後藤直成,石坂丞二
    • Organizer
      日本陸水学会近畿支部会
    • Related Report
      2019 Research-status Report
  • [Presentation] 琵琶湖北湖におけるSGLIのリモートセンシング反射率データの検証2019

    • Author(s)
      大賀雄介,後藤直成,石坂丞二
    • Organizer
      日本リモートセンシング学会 海洋・湖沼リモートセンシング研究会
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi