Fig. 5. Methane production potential (MPP) in the deep profundal sediments (a) after oxic SO^2-₄ and (b) after anoxic SO^2-₄ treatments, and in the shallow profundal sediments (c) after anoxic SO^2-₄ and (d) after oxic NO^-₃ treatments. The averages and standard error of the means are shown. Statistical differences between the treatments in each layers are marked with a, b, and c (Tukey-B post hoc test).

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