Fig 3.

Dendrogram showing the phylogenetic position of 16S rRNA gene sequences retrieved from the samples analyzed in this study among selected reference sequences of the domain Archaea. Sequences from this study are grouped into 14 98% similar OTUs and printed in boldface type. The tree was constructed in the ARB software package using the maximum likelihood (PHYML) algorithm and nonparametric bootstrap analysis. The percent bootstrap values are based on 100 replicates and are indicated at the nodes with ≥50% bootstrap support. Bar, 10% estimated sequence divergence.