Fig. 2
Histograms indicating climatic comparisons. (a) Temperature annual range (Bio_7), (b) Precipitation seasonality (Bio_15) among LIG (black), LGM (dark grey) and Present (light grey) and (c) relations of temperature variations (Bio_7) (y axis) and latitudes (x axis) at LIG. The means of each variable was calculated based on 1506 occurrence records after spatial filtration at 1 km2 of all the combination records of 11 birds. The temperature data are in centigrade, precipitation is in millimeters and the latitudes are in degrees. The asterisk (*) indicates P ≤ 0.001 calculated with a paired-samples T test