Figure 4.

Differences between microbial communities incubated with or without methane, oxygen and nitrate.

A, Sediment community richness in the incubations was lower than in the field, but differences between conditions were not significant (Wilcoxon rank sum test).

B, Nonmetric multidimensional scaling (NMDS) plot showing mesocosm communities were different from field communities but similar to each other across all experiments, independent of conditions (colors are the same as in panel a).

C, Relative sequence abundance of methanotrophs was higher in experiments with oxygen (Kruskal‐Wallis rank sum test). Sequence abundances of other methylotrophs were not significantly different.

D, No significant differences in sequence abundances of methanotrophs and other methylotrophs were observed between experiments with and without nitrate. [Color figure can be viewed at http://wileyonlinelibrary.com]