Additional file 10 of Climatic and topographic changes since the Miocene influenced the diversification and biogeography of the tent tortoise (Psammobates tentorius) species complex in Southern Africa

Additional file 10: Table S19. The correlation matrix retrieved from the correlation test between each pair of bioclimatic variables. The R-square values varied from zero to one, with "zero" representing no correlation and "one" representing 100% correlation. The bioclimatic variables (in bold) are the ones used in further niche modelling analyses after trimming variables showing strong correlation. The pairwise values (R-square) > 70 or < -70 were considered as strong correlations. All pairwise R-square values showing a strong correlation between bioclimatic variables are underlined.