Fig. 4From: Understorey phylogenetic diversity in thermophilous deciduous forests: overstorey species identity can matter more than species richnessBoxplots showing variation of a) NRI, and b) NTI, in relation to overstorey species richness expressed as number of target species. The significance thresholds for significantly diverging values of NRI and NTI are indicated with dotted lines (+ 1.96 and − 1.96)Back to article page