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Maps showing the sampling stations. (A) Sampling sites in the estuarine marsh in south Hangzhou Bay. (B) Surface sediment samples (S-N, S-M, and S-F) were collected along transects based on distance to the water-land junction (about 300 m, 1,000 m, and 2,500 m, respectively) (see Table 1 for a detailed description of the sampling sites).
