Fig. 7.

Phylogenetic distance tree based on the comparative analysis of archaeal partial 16S rRNA sequences recovered from a representative oil amended microcosm on day 302. Sequences recovered in this study (grey text) are prefixed by MO302. Related organisms identified in petroleum systems or those directly implicated in oil degradation are in bold. GenBank accession numbers for all database sequences are provided in parenthesis. Tree rooted with respect to the Sulfolobus yangmingensis 16S rRNA sequence (AB010957). The scale bar denotes 10% sequence divergence and the values at the nodes indicate the percentage of bootstrap trees that contained the cluster to the right of the node. Bootstrap values less than 50 are not shown.