Effects of sediment regime alteration to stream habitat structure and fish assemblage related to watershed geology

2016 Fiscal Year Final Research Report

• Project/Area Number: 26740048
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental and ecological symbiosis
• Research Institution: Public Works Research Institute
• Principal Investigator: Nagayama Shigeya 国立研究開発法人土木研究所, 土木研究所(つくば中央研究所), 研究員(移行) (70540558)
• Research Collaborator: TASHIRO Takashi ; HARADA Morihiro ; TAKAOKA Hiroki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 地質 / 河川 / 生息場 / 魚類 / ダム / 土砂レジーム

Outline of Final Research Achievements

We examined stream habitat structure and fish assemblage with reference to watershed geology and effects of check dam on them via sediment regime alteration. Streams with different watershed geology showed different habitat structures with different riverbed environments. The characteristics of habitat structures affected fish assemblages, probably leading to different fish assemblages associated with different geology. Habitat structure (channel-unit and substrate compositions) and fish assemblage of the downstream of check dam was altered, indicating potential loss of geology-related fish assemblages.

Free Research Field

応用生態工学、流域保全学