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Hydrogen consumption and SRB activity in two microbial mat types from Guerrero Negro, B.C.S., Mexico. Net hydrogen sulfide production (both mats) (A), net hydrogen production in GN-I mats (B), net organic acid production in GN-I mats (C), and net hydrogen production in GN-S mats (D), showing the effect of physical disruption, sulfate deprivation, and molybdate addition on microcosms. Error bars indicate standard deviation of 6 replicate trials.
