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発表 Temporal changes of aquatic insect assemblages by sequential sediment additions through a sediment bypass tunnel

作成年度 2019 年度
論文名 Temporal changes of aquatic insect assemblages by sequential sediment additions through a sediment bypass tunnel
論文名(和訳)
論文副題
発表会 3rd International Workshop on Sediment Bypass Tunnels
誌名 3rd International Workshop on Sediment Bypass Tunnels
巻・号・回 4 
発表年月日 2019/04/09 ~ 2019/04/12
所属研究室/機関名 著者名(英名)
Public Works Research InstituteMasanao Sueyoshi
Public Works Research InstituteYukio Onoda
Public Works Research InstituteYukio Miyagawa
Public Works Research InstituteYuichi Kayaba
Public Works Research InstituteKeigo Nakamura
抄録
Long-term and sequential restoration trials are often required for the conservation of stream ecosystems at downstreams of dams. In the Koshibu River, Japan, sediment additions through a sediment bypass tunnel of Koshibu Dam have been conducted seven times during 2016-2018 to restore the instream substrate environments and inhabiting organisms. To assess the effects of sediment addition on riverbed environments and aquatic insects, we measured size of substrate particles and collected insects at impacted (downstream of Koshibu Dam) and reference reaches (upstream of Koshibu Dam and Toyama River) during Jun 2016-Nov 2018.Before the sediment additions, the impacted reaches lacked gravels (2-16 mm) and pebbles (16-64 mm), and the biotic assemblages in the impacted reaches were significantly different to those in the reference reaches. After the first sediment addition (Oct 2016), there were no difference of gravels and pebbles between the impacted and reference reaches, whereas assemblages remained different between those reaches. However, from third-fourth sediment additions (Oct 2017), assemblages in the impacted reaches were gradually close to those in the reference reaches. These results indicate that shifts in community assembly follow abiotic habitat changes and require long-term and sequential sediment additions.
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