EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/26/2021 | 8:30 AM - 10:30 AM | Effects of sediment replenishment on riverbed environments and macroinvertebrate assemblages downstream of a dam | Virtual Platform
Effects of sediment replenishment on riverbed environments and macroinvertebrate assemblages downstream of a dam
This study examined the effects of sediment replenishment on a riverbeds and macroinvertebrates for a dammed river before and after sediment replenishment. We evaluated particle sizes of replenished sediments, and the case material of case-bearing caddisfly. We observed significant changes in macroinvertebrate assemblages before and after sediment replenishment, and between the upstream and tributary references and downstream of the dam. Percentages of Ephemeroptera, Plecoptera, and Trichoptera, and the number of inorganic case-bearing caddisflies downstream of the dam following sediment replenishment, were significantly higher than the upstream and tributary reference sites. The particle size of case materials used by case-bearing caddisfly corresponded to the size of replenished sediment. Dissimilarity results after replenishment showed that assemblages downstream of the dam diffed from upstream sites, although they were similar to the tributary sites. The dissimilarity between the tributary and downstream of the dam was the same as that between the upstream and tributary. Sediment replenishment was observed to reduce the harmful effects from the dam, and partly restore benefits such as increasing species diversity and altering community assemblages, similar to the effects of tributary inflows.
- Biodiversity
- Freshwater continuum
- Rehabilitation
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Presenters/Authors
Izumi Katano
(), Nara Women’s University, katano@cc.nara-wu.ac.jp;
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Junjiro Negishi
(), Hokkaido University, negishi@ees.hokudai.ac.jp;
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Tomoko Minagawa
(), Kumamoto University, minagawa@kumamoto-u.ac.jp;
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Hideyuki Doi
(), University of Hyogo, hideyuki.doi@icloud.com;
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Yôichi Kawaguchi
(), Tokushima University, kawaguchi@ce.tokushima-u.ac.jp;
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Yuichi Kayaba
(), Public Works Research Institute, y-kayaba@pwri.go.jp;
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