FIG. 5.

Ordination diagram from pCCA of nirS TRFLP data, where elevations and DOC were the covariables. Metals are represented by arrows, the lengths of which indicate the strength of correlation between the metal and the community data. Samples are labeled using their station names and denoted by triangles and circles. Open triangles pointing upward indicate high-elevation samples, filled triangles pointing downward indicate low-elevation samples, and filled circles indicate middle-elevation samples.