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Principal components analysis (PCA) of relative gene abundances (TIGRFAMs) across six phototrophic sites. Principal components (PC1, PC2, PC3) obtained across all TIGRFAMs grouped into functional categories (also see Figure A8 in Appendix for hierarchal cluster analysis). Site-pairs are circled based on separation achieved with PC1 and/or PC2 (BLVA_5 = fuschia, BLVA_20 = purple, WC_6 = light-blue, CP_7 = gold-brown, MS_15 = green, FG_16 = red).
