Principal coordinates analysis (PCoA) ordination of dissolved organic matter (DOM). The distances between symbols represent the dissimilarity between DOM in each lake. Using three axes, we can explain 71% of the variation in DOM composition. The third axis (not shown) captures 14% of the variation. Symbol sizes reflect variation in the concentration of dissolved organic carbon (DOC). Vectors represent the correlations between DOM composition and various physical and chemical attributes of each lake including: pH, elevation (elev), area, DOC, total nitrogen (TN), total phosphorus (TP), and chlorophyll a (Chl). Solid arrows represent significant and dotted represent nonsignificant correlations. Significance based on 10,000 permutations
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