Figure 4: Correlation between native mycorrhizal associations and cover of non-native species. For each mycorrhizal-type association, the proportion of the vegetation cover in roadside plots (0 m to 2 m from the road) which was of non-native origin was plotted against the proportion of the native vegetation in plots perpendicular and away from to the road (52 m to 102 m from the road) which was associated with each mycorrhizal type. Each dot represents an individual pair of plots. Regression lines were plotted using the results of generalized linear models (see methods and Table 3) and individual dots were colored according to elevation from low elevation (green) to high elevation (red).