Figure 3.

Archaeal 16S rRNA gene-based phylogenetic tree (neighbor-joining method) of sequences retrieved from sites at Rivière du Loup and Shippagan in bold and similar sequences from GenBank. Distances were computed using the maximum composite likelihood method in the MEGA v5 package. In reference to Figure 2, black circles represent clones related to unknown Crenarchaeota or the single sequence EC Arch 32, open circles and black diamonds represent unknown Euryarchaeota, upward pointing black triangles represent the class Methanobacteria, and downward pointing black triangles represent Rice Cluster II. Scale bar units are the number of base substitutions per site.