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

Evaluation of Submarine Groundwater Discharge(SGD) effects on the fisheries resources based on stable & radio isotopes techniques

Research Project

Project/Area Number 22710012
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Environmental dynamic analysis
Research InstitutionNagasaki University

Principal Investigator

UMEZAWA Yu  長崎大学, 大学院・水産・環境科学総合研究科, 助教 (50442538)

Project Period (FY) 2010 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords生物海洋 / 有明海 / 地下水 / 安定同位体 / 栄養塩動態 / 食物連鎖 / 低次生態系 / 海洋科学 / 海洋物理・陸水学 / 地球化学 / 水産学 / 環境分析
Research Abstract

Terrestrial freshwater and associated nutrient fluxes affect primary production at coastal areas. Differently from river water like Chikugo River, however, the contribution of groundwater discharge to coastal ecosystem has not been well evaluated in Ariake Bay. In this study,^<222> Rn was considered as a good indicator of groundwater, because^<222> Rn concentrations in groundwater along the west coast of Ariake Bay were one or three orders of magnitude higher than those in river waters.^<222> Rn distribution standardized based on the accumulated rainfall and water depth at the sampling location successfully indicated a spatial variation of groundwater discharge. Furthermore, total groundwater fluxes were evaluated from the^<222> Rn distributions, because spatial distributions of^<222> Rn were correlated with actual groundwater fluxes measured at 5 different locations. Nutrient fluxes through the groundwater discharge had also spatial variation ; 7. 8 to 510 kg-N day^<-1> for DIN(dissolved inorganic nitrogen), and 0. 5 to 3. 9 kg-P day^<-1> for DIP(dissolved inorganic phosphorus), with the maximum values at Shimabara area, where both groundwater fluxes and nutrient concentrations in groundwater were highest. On the other hand, the impact of groundwater-derived nutrients on marine ecosystem at offshore area was not observed from the researches usingδ^<15> N in nitrate andδ^<13> C andδ^<15> N in organic matter. Along the west coast of Ariake Bay, where there are no big rivers, groundwater can be important nutrient sources to enhance primary production, resulting in good food sources for bivalves and blooming of green macroalgae. However, the influential areas of groundwater-derived nutrients would be limited in shallow coastal areas.

Report

(3 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • Research Products

    (17 results)

All 2012 2011

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (11 results)

  • [Journal Article] Groundwater Dynamics of Fongafale Islet, Funafuti Atoll2011

    • Author(s)
      Nakada S, Umezawa Y, Taniguchi M and Yamano H
    • Journal Title

      Groundwater

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Nutritional ecology of a territorial farmer fish, Stegastes nigricans2011

    • Author(s)
      Hata H and Umezawa Y
    • Journal Title

      Ecological Research

      Volume: No.26 Pages: 809-818

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Multiple isotope(H, O, N, S, and Sr) approach elucidates the complex pollution causes in the shallow groundwaters of Taipei urban area2011

    • Author(s)
      Hosono T, Wang CH, Umezawa Y, Nakano T, Yoshimizu C, Tayasu I, Nagata T, Onodera S, and Taniguchi M
    • Journal Title

      Journal of Hydrology

      Volume: 397 Pages: 23-36

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Nutritional ecology of a territorial farmer fish, Stegastes nigricans2011

    • Author(s)
      Hata, H.
    • Journal Title

      Ecological Research

      Volume: 26 Pages: 809-818

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Groundwater Dynamics of Fongafale Islet, Funafuti Atoll2011

    • Author(s)
      Nakada, S.
    • Journal Title

      Groundwater

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multiple isotope (H, O, N, S, and Sr) approach elucidates the complex pollution causes in the shallow groundwaters of Taipei urban area2011

    • Author(s)
      Hosono, T.
    • Journal Title

      Journal of Hydrology

      Volume: 397 Pages: 23-36

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] 栄養塩と画分別懸濁態粒子の安定同位体比を用いたハルマンスナモグリ幼生の食物源の解明2012

    • Author(s)
      木山孔司
    • Organizer
      日本海洋学会春季大会
    • Place of Presentation
      筑波大学、つくば
    • Year and Date
      2012-03-28
    • Related Report
      2011 Annual Research Report
  • [Presentation] 栄養塩と画分別懸濁態粒子の安定同位体比を用いたハルマンスナモグリ幼生の食物源の解明2012

    • Author(s)
      木山孔司・梅澤有・玉置昭夫
    • Organizer
      日本海洋学会春季大会
    • Place of Presentation
      筑波大学,つくば
    • Related Report
      2011 Final Research Report
  • [Presentation] Seasonal shift of the contribution of Changjiang River and Kuroshio water to nutrient dynamics at continental shelf of East China Sea2012

    • Author(s)
      Umezawa Y
    • Organizer
      ASLO Ocean Science Meeting
    • Place of Presentation
      Salt Lake City, USA
    • Related Report
      2011 Annual Research Report 2011 Final Research Report
  • [Presentation] 硝酸同位体を用いたアジア大都市域の地下水・雨水汚染解析2011

    • Author(s)
      梅澤有
    • Organizer
      同位体環境学シンポジウム
    • Place of Presentation
      総合地球環境学研究所、京都(招待)
    • Year and Date
      2011-09-29
    • Related Report
      2011 Annual Research Report
  • [Presentation] 有明海西岸域への地下水由来の栄養塩供給量の評価2011

    • Author(s)
      塩川麻保
    • Organizer
      日本海洋学会秋季大会
    • Place of Presentation
      九州大学、福岡
    • Year and Date
      2011-09-28
    • Related Report
      2011 Annual Research Report
  • [Presentation] Impact of Isahaya dike construction on physical environments and ecosystems in Ariake Bay, Kyusyu, Japan2011

    • Author(s)
      Umezawa, Y.
    • Organizer
      International Workshop on Coastal Observations and Sediment Transport in Coastal Zones
    • Place of Presentation
      国立中央大学、台湾(招待)
    • Year and Date
      2011-06-27
    • Related Report
      2011 Annual Research Report
  • [Presentation] Introduction of the coastal areas & the studies on nutrient dynamics around Nagasaki2011

    • Author(s)
      Yu Umezawa
    • Organizer
      International Symposium on the Sustainability and Productivity of Coastal Resources
    • Place of Presentation
      Nagasaki University
    • Year and Date
      2011-01-19
    • Related Report
      2010 Annual Research Report
  • [Presentation] 硝酸同位体を用いたアジア大都市域の地下水・雨水汚染解析2011

    • Author(s)
      梅澤有
    • Organizer
      同位体環境学シンポジウム,総合地球環境学研究所
    • Place of Presentation
      京都
    • Related Report
      2011 Final Research Report
  • [Presentation] 有明海西岸域への地下水由来の栄養塩供給量の評価2011

    • Author(s)
      塩川麻保・山口聖・梅澤有
    • Organizer
      日本海洋学会秋季大会
    • Place of Presentation
      九州大学,福岡
    • Related Report
      2011 Final Research Report
  • [Presentation] Impact of Isahaya dike construction on physical environments and ecosystems in Ariake Bay, Kyusyu, Japan2011

    • Author(s)
      Umezawa Y
    • Organizer
      International Workshop on Coastal Observations and Sediment Transport in Coastal Zones
    • Place of Presentation
      Taoyuan, Taiwan
    • Related Report
      2011 Final Research Report
  • [Presentation] Introduction of the coastal areas and the studies on nutrient dynamics around Nagasaki2011

    • Author(s)
      Umezawa Y
    • Organizer
      Inter-national Symposium on the Sustainability and Productivity of Coastal Resources
    • Place of Presentation
      Nagasaki
    • Related Report
      2011 Final Research Report

URL: 

Published: 2010-08-23   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi