Fig. 6
Floristic turnover rates across tropical Africa. Values based on adaptive resolution sampling unit (explanation see text). Pairwise floristic similarity is computed as 1–βsim turnover index using two values of μ (see section in Methods and Additional file 1). a Meso-scale floristic turnover rate with μ = 1°; b Large-scale turnover rate with μ = 2°. Dashed lines represent the limits for tropical Africa as defined in our study. Maps based on georeferenced herbarium records, silica gel samples and plot data