Author(s): Tomoko Minagawa; Sayuri Kodama; Hideyuki Doi
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Keywords: No Keywords
Abstract: The Arase Dam on the Kuma River in Kumamoto Prefecture, Japan, has been subsumed under a removal project as the first high-dam removal in Japan. The estimation of the recovery of aquatic life after dam removal is vital for river restoration. In this study, the abundance/biomass of P. altivelis was investigated via environmental DNA (eDNA) analysis after the dam removal to evaluate the recovery of P. altivelis habitat. Environmental DNA analysis is a useful tool to estimate fish abundance/biomass as well as their spatial distribution in the river. Results indicated that the habitat of P. altivelis was recovered from 1.6×10 m to 34.6×10 m in the section where it was the dam reservoir.
Year: 2018