Figure 3
From: A hierarchy of environmental covariates control the global biogeography of soil bacterial richness
Dependence of the log-ratio of number of rare and common species per sample on the two main predictors of bacterial richness; (a) climatic water content (adjusted R2 = 24.5%, deviance explained 25.5%, AIC = 70.5, EDF = 4.3) and (b) soil pH (R2 = 23.0%, deviance explained 23.9%, AIC = 77.0, EDF = 4.1). The log ratio is calculated by splitting species into two groups based on a threshold of global relative abundance (0.005%). A log ratio of zero indicates a balanced population, where the number of rare species per sample equals the number of common species. The modeled curves of both groups richness (rare and common) are shown for (c) climatic water content and (d) soil pH. Shaded areas correspond to standard errors (n = 320).
