Fig. 4

Kernel density plots for 19 environmental parameters of the northern (blue curves) and southern (pink curves) clusters of M. thunbergii. Differentiation among groups was evaluated by a nonparametric Kruskal-Wallis multiple-range test, and the results are indicated in each plot. A lack of significant difference (at the P < 0.05 level) is indicated by an equal sign, while significant differences are coded as either higher or lower