Research on the impact of water discharge from Shichikawa Dam in Kozagawa River system onto the benthic community in Kushimoto Bay

2009 Fiscal Year Final Research Report

• Project/Area Number: 19310022
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental impact assessment/Environmental policy
• Research Institution: Kyoto University
• Principal Investigator: SHIRAYAMA Yoshihisa Kyoto University, フィールド科学教育研究センター, 教授 (60171055)
• Co-Investigator(Kenkyū-buntansha): FUKAMI Hironobu 京都大学, フィールド科学教育研究センター, 助教 (50402756) ; KATO Tetsuya 京都大学, フィールド科学教育研究センター, 技術職員 (20397566) ; SHIMANAGA Motohiro 熊本大学, 沿岸域環境科学教育研究センター, 准教授 (70345057)
• Project Period (FY): 2007 – 2009
• Keywords: 環境影響 / ダムの放流 / 底生生物群集 / 森里海連環 / 串本湾

Research Abstract

The impact of water discharge from Shichikawa Dam build in Kozagawa water system of Wakayama Prefecture onto the benthic community in the river mouth region of Kushimoto Bay was analyzed. The relationships among water discharge and increase of turbidity in river water and sea water in the river mouth area were not always clear. The characteristics of benthic community and benthic environment indicated some influence by river but not directly related to the water discharge from dam. The trial to use molecular techniques for rapid identification of polychaetes was successful when mitochondrial CO1 region was used as a marker.