Appendix C. Principal components analysis (PCA) of seasonal samples in structural space.
FIG. C1. PCA of seasonal samples in structural space. Symbols are streams in forested (ORNL: East Fork Walker Branch, filled square; West Fork Walker Branch, open square;CWT: Hugh White Creek, open diamond; Snake Den Branch, filled diamond) and open-canopied (Gallina Creek, filled circle; Rio Calaveras, open circle) catchments. Sites were ordinated based on independent variables used to address metabolic and biogeochemical responses including: stream discharge, velocity, depth, width, cross-sectional area, NO3-N, SRP, temperature, and PAR. Ordinatioin explained 79% of variation over three axes. |