Fig. 3

Intervention scores for a the nine plant groups and b the 29 plant species across the five study regions (mean, standard error, maximum, and minimum value) computed from the forest manager survey. The point type used for the minimum and the maximum values for each group or species indicates the region where the value is observed. Groups and species were ranked by decreasing average frequency of intervention. In b, dashed horizontal lines correspond to the thresholds, y = 0.25 and y = 0.5, used in the three sets of conditions that define species requiring frequent, intermediate, and occasional vegetation control according to forest managers. “Groups” correspond to the plant group to which each species belongs and “species numbers” to the number assigned to each species and given in Appendix Table 4