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Fig. 3. Canonical ordination of Clarksville soil community-level physiological profiles (CLPP) profiles derived from redundancy analysis. Percentages on axes are percent of total variation in dataset explained; 81% of the variability that can be attributed to experimental treatments is shown by this plot. Lines represent substrate vectors showing their contributions to the ordination. Only substrates with >22% of variance explained by the experimental treatments are shown. Each vector label corresponds to the well containing the substrate in GN Biolog plates; A8 = N-acetyl-D-glucosamine, A10 = L-arabinose, B6 = 
-D-glucose, C1 = D-melibiose, C6 = D-sorbitol, E5 = -keto valeric acid, F2 = succinamic acid, F9 = L-aspartic acid, G4 = L-ornithine, G6 = L-proline, H5 = phenyl ethylamine. Symbols represent positions of individual replicate profiles. Squares, Pioneer corn; circles, Syngenta corn; white, Bt corn; black, non-Bt corn. PC, principal component.
