3.3 Contribution of environmental variables
The Jackknife analyses results showed that the variables with high contribution to the model were Bio9, Bio14, and POP, with a total contribution of 70.8%. Among them, the contribution rate of Bio9 is 38.4%, that of Bio14 and POP is 16.2%, detailed analysis results are shown in the Table S5. Meanwhile, the range, mean value and optimal range of each variable (the probability of species existence>0.5) is shown in Table S6 and Fig.3. For variables with higher contribution (Bio9, Bio14, POP), there were significant differences in the mean values between the locations of occurrence and absence.