Submarine Groundwater Discharge helps making nearshore waters heterotrophic.

We do not have sufficient CH 4 data (n = 13) to see a clear trend relative to the salinity but the average CH 4 concentration (523.1 ± 1,231 nM; Table 1 ) in the SGD is clearly higher than that in the local surface seawater (240 ± 554 nM; Table 1 ).

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