Variation of whole toxicity spectrum of riverwater samples collected in two different watershed areas and regression analysis between the toxicity and the selected basic water quality items

2015 Fiscal Year Final Research Report

• Project/Area Number: 25340099
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental risk control and evaluation
• Research Institution: The University of Tokushima
• Principal Investigator: Yamamoto Hiroshi 徳島大学, 大学院ソシオ・アーツ・アンド・サイエンス研究部, 准教授 (60380127)
• Research Collaborator: TATARAZAKO Norihisa 国立環境研究所環境リスク研究センター, 環境リスク研究推進室, 室長
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 生態毒性 / 主成分分析 / 流域管理 / 年間変動 / 短期慢性毒性 / 海洋発光細菌 / 化学物質管理 / 一般水質項目

Outline of Final Research Achievements

We collected water samples monthly at Takase Bridge of the Yoshino River and annually at total of seven sites in the Yoshino River and the Yodo River watershed area. The luminescence inhibition of oceanic photobacteria was measured in addition to the short-term chronic toxicity tests using fish, daphnia, and algae was conducted. We detected chronic toxicity for green algae and daphnia from four and six samples respectively among 34 monthly samples while fish and bacterial toxicity was found for only one sample and none. The chronic toxicity was detected for those samples collected at the Tamiya Creek, an urban creek in Tokushima City, and Tokura Bridge of the Ina River of the Yodo River watershed. As a result of principal component analysis and regression analysis, moderate regression was found between basic water quality items such as BOD, COD, and ammonia while daphnia and algal toxicity was found to be somewhat independent from these items.

Free Research Field

生態毒性学、環境化学、環境工学