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Stream ecosystems assessment between the upstream and downstream of a dam

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The dam construction has a substantial impact on the downstream environment. Monthly observation was carried out during the trial impoundment of a large concrete dam, including water temperature, organic matter fluxes, epilithic chlorophyll-a, and invertebrate communities both at the upstream and the downstream of the impoundment. Temperature in the downstream water was substantially higher compared to that of the upstream. CPOM fluxes in the downstream became lower than that of the upstream even with one day retention period of the impoundment, although FPOM fluxes did not change much.

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