Fig. 6

Potential distributions of the four major lineages of Bulbophyllum from the Neotropics, Africa, Madagascar and the Asia-Pacific region. a at the present (c. 1950–2000) and b) at the Last Glacial Maximum (LGM; c. 21,000 years ago). Ecological niche models (ENMs) were generated for each region separately using current bioclimatic variables (Additional file 1: Table S5) on the basis of extant occurrence points (Fig. 1b) of the genus using MAXENT v. 3.3.3 k. Potential distributions for the LGM are based on a consensus projection between CCSM and MIROC (see text). Predicted distribution probabilities are shown as logistic values of suitability above the region-specific maximum training sensitivity plus specificity (MTSS) thresholds. Maps were generated using ArcGIS v. 10.4.1