Fig. 7
The scatterplots of the distribution of genetic distance along the geographic distance (a) and environment distance (b), respectively. The red line represents the multiple matrix regression with randomization (MMRR) equation with 95% confidence interval. a Geographic distance was positively correlated with genetic distance. MMRR: Slope = 0.2189 (95% CI 0.1786–0.2592), Y-intercept = − 0.3718 (95% CI − 0.5443–− 0.1992), X-intercept = 1.698 (95% CI 1.109–2.112), R2 = 0.2944, F = 114.3, P = 0.001. b Environment distance was also positively correlated with genetic distance. MMRR: Slope = 0.2060 (95% CI 0.1291–0.2829), Y-intercept = 0.2275 (95% CI 0.09839–0.3566), X-intercept = − 1.104 (95% CI − 2.734–− 0.3513), R2 = 0.09436, F = 27.82, P = 0.001