Dynamics and Ecological Risk of Lake Biwa Natural Organic Matter by Stable Isotope Labelling and Omics Analysis

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360216
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Civil and environmental engineering
• Research Institution: Kyoto University
• Principal Investigator: SHIMIZU Yoshihisa 京都大学, 工学(系)研究科(研究院), 教授 (20226260)
• Co-Investigator(Kenkyū-buntansha): KUSAKABE Taketoshi 京都大学, 工学研究科, 特定研究員 (40462585)
• Co-Investigator(Renkei-kenkyūsha): MATSUDA Tomonari 京都大学, 工学研究科, 准教授 (50273488) ; HAYAKAWA Kazuhide 滋賀県琵琶湖環境科学研究センター, 総合解析部門, 専門研究員 (80291178) ; OKAMOTO Takahiro 滋賀県琵琶湖環境科学研究センター, 環境監視部門, 専門員 (70508473)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 琵琶湖 / 天然有機物 / 溶存有機物

Outline of Final Research Achievements

Annual amount of organic carbon eluted from sediment of Lake Biwa was estimated at 510 tC from elution tests with undisturbed sediment cores. It is suggested that hypoxia (oxygen depletion) near the bottom of Lake Biwa increases organic loads from the sediment to water column. Molecular markers of refractory organic matter derived from Microcystis aeruginosa were demonstrated by stable isotope labelling and MS- and NMR- based omics analysis. Photosynthesis inhibition of natural dissolved organic matter was significantly detected by a ten-fold concentration.

Free Research Field

環境工学