Fig. 2: Maps of the environmental variables used in model building. (a): annual temperature range; the difference between the maximum temperature of the warmest month (September) and minimum temperature of the coldest month (January). (b): mean temperature of the warmest quarter of the year, July-September. (c): precipitation of the warmest quarter of the year, July–September. (d): precipitation of the coldest quarter of the year, December–February. (e): soil type; light green areas are ultramafic soils and tan are all other soil types, including basalt and the sand of the Magdalena Plains on the peninsula. Temperature variables are in degrees C, and precipitation in mm.