Figure 2From: Regional-scale relationship among biological soil crusts, invasive annual grasses, and disturbanceRelationship between biocrusts and annual grasses. Points are jittered slightly to improve visibility of overlapping points. Lines indicate the thresholds between low and high levels of groundcover, used to determine that the proportion of plots with high annual grass cover is significantly greater among plots with low biocrust cover (p = 0.0015).Back to article page