FIG 3.

Redundancy analyses of microbial community composition. (A) Redundancy analysis (RDA) biplot of microbial community composition in relation to physical variables and spatial arrangement of sites. The cluster of points in the upper left corner are Robert’s Massif. (B) Relationship between RDA Axis 2 and soil NO₃- concentrations. Thick blue line shows the linear model fit to all observed data, and thin blue lines show 1,000 bootstrapped linear regressions. (C) Relationship between Soil PC 1 and distance from the coast (km) for each site. Thick blue line shows the LOWESS fit to all observed data, and thin blue lines show 1,000 bootstrapped LOWESS fits.