Figure 3.

Community compositions based on 16S rRNA gene amplicons for samples from Aragona (A) and Paterno (B). Methane concentrations (solid circles) and isotopic compositions (open circles; only for site Aragona) in the left panel are provided to constrain the possible methane metabolisms. Two primer sets (see Table 1 for detailed information) were used to amplify individual bacterial and archaeal communities of each sample. Archaeal community compositions for the mud pool and bottom sediments at Paterno could not be obtained because the DNA concentrations were too low.