Figure 3. Relationship between exotic plant invasion and the proportion of putative fungal pathogens shared between native and exotic plants. A. Asymmetric sharing of pathogens between native and exotic plants in communities. The black line is fitted through the observed data from the community experiment showing the proportion of pathogens shared as a function of the realized proportion of exotics in pots, and the grey lines represent 1,000 simulations of a null model of random sharing. Note that proportions of 0 and 1 must have zero sharing by definition. B. Deviation between the observed (black line) and the null expectation (red line) of pathogen sharing between native and exotic plants. Together, A and B show that communities with few exotic plants have lower than random sharing of pathogens, whereas exotic-dominated communities have higher than random sharing.