Fig. 4. Principle component analysis of fatty acid methyl esters (FAME) present in wetland soil from Kejimkujik monzogranite (diamond), greywacke (circle), black sulfidic slate (square) or gray sulfidic slate (triangle). Open symbols are the average principle component scores for each lithology and closed symbols are the average principle component scores for each site. Inserted graph is the relative weighting of established Desulfobulbus FAME biomarkers for Principle Component 1 and 2.