Absence of oxygen effect on microbial structure and methane production during drying and rewetting events.

The increase in the relative abundance of Pusillimonas after the drying-rewetting events, especially later for the air-dried samples, suggests that acetolactic bacteria might have competed temporally with acetoclastic methanogens (in our case Methanosarcina) for acetate, especially when the latter was inhibited. Microbial community dynamics under dry and oxic stress in ADs have garnered limited interest, and most studies have focused on the responses in natural environments such as soil and lake sediments where an overall trend of increasing gram-positive phyla ( e.g., Firmicutes) in relation to gram-negative phyla ( e.g., Proteobacteria and Bacteroidetes) has been reported 5 , 49 .

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