FIG 5.

Dissimilarity of modeled communities to observed communities when modeled communities were structured by neutral, dispersal, or environmental processes. (A) Averaged Sørenson dissimilarity of simulated communities from observed communities. For each site, we took the average pairwise dissimilarities to the observed site from 1,000 model simulations. Thick lines show the LOWESS fit to the averaged dissimilarities as a function of soil NO₃- concentrations. (B) For each site, we took the average pairwise dissimilarities to the observed site from 1,000 model simulations. Thick lines show the LOWESS fit to the average dissimilarities as a function of soil NO₃- concentrations. Thin lines show 1,000 bootstrap simulations. In all simulations, phylum richness was fixed to the observed level for each site.