Figure A2.

Hierarchical cluster analysis of relative gene abundances in the TIGRFAM role category “Electron Transport” across seven archaeal-dominated geothermal communities. TIGRFAM gene families with low variation across the sites were removed before the clustering to retain ∼50 of the most variable families. Subunits of the protein complexes were only represented by one representative TIGRFAM family. Pearson correlation was used as the distance measure for average linkage agglomerative clustering.