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Study area and sampling sites in the Yangtze River basin, China. Note: The Yangtze River mainstem is divided into five reaches: the headwaters of the Yangtze River (HYZ), the Jinsha River (JSR), the upper reaches of the Yangtze River (UYZ), the middle reaches of the Yangtze River (MYZ), and the lower reaches of the Yangtze River (LYZ).
