Non-native species
The proportion of mycorrhizal association types amongst the native
vegetation was significantly correlated with the proportion of
non-native species in the total vegetation cover, both in the roadside
plots (Fig. 4, Table 3) and in the adjacent plots (Fig. S2, Table 3).
Coincident with the AM or NM status of almost all non-native species, we
observed that higher proportions of AM and NM native plant cover
correlated with higher proportion of non-native cover both in the
roadside plots (Fig. 4) and in the adjacent plots (Fig. S2). The
opposite pattern was true for EcM and ErM vegetation cover. Elevation
was as expected also strongly correlated with non-native plant cover,
with higher elevation plots being on average less colonized by
non-native plant species.