FIG 4.

Spearman correlations between bacteria in host-associated intestinal communities differ from the predictions of a neutral sampling model. (A to C) Histograms of Spearman correlation coefficients calculated from data for (A) N2 (n = 164), (B) daf-16 (n = 100), and (C) daf-2 (n = 98) intestinal communities, with a bin size of 0.1. (D to I) Histograms of Spearman coefficient 20th and 80th quantiles from data simulated using host lineage-specific parameterizations of the Dirichlet-multinomial model (n = 10,000 simulated data sets per condition). Red lines indicate the corresponding quantile from the empirical data, and P values indicate the one-tailed percentage of simulated data sets with a lower 20th quantile (D to F) or higher 80th quantile (G to I) than the empirical data.