Fig. 2.
Number of nematode prey (bacterivorous, fungivorous, and root-feeding nematodes) per predator (predaceous and omnivorous nematodes) by precipitation levels. (A) Prey-to-predator ratio as a function of received growing-season precipitation for all of the sites combined (n = 240). (B) Prey-to-predator ratio as a function of long-term mean annual precipitation (MAP) across a regional gradient (n = 240). Solid trend lines track the center of the distribution (50th percentiles) of the relationship between precipitation regressors and prey-to-predator ratio estimated by mixed-effect quantile estimates (Received precipitation: slope τ0.5 = −0.005, pτ0.5 = 0.009; MAP: slope τ0.5 = −0.006, pτ0.5 = 0.006). Dotted and dashed trend lines represent the 10th (Received precipitation: slope τ0.1 = −0.03, pτ0.1 < 0.001; MAP: slope τ0.1 = −0.03, pτ0.1 < 0.001) and 90th percentiles (Received precipitation: slopeτ0.9 = 0.02, pτ0.9 < 0.001; MAP: slope τ0.9 = 0.014, pτ0.9 < 0.001) of the distribution, respectively.