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Fig. 1


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Map of the study site in the Pearl River, China. Solid black arrow indicates the study site and golden bars indicate dams (Wacun Dam, Baise Dam, Dongsun Dam, Naji Dam, Yuliang Dam, Jinjitan Dam from upstream to downstream, respectively) in the Youjiang River. Black pushpins indicate the location of artificial structures and white pushpins indicate control sites. Artificial structures are also shown in the lower-right corner.

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