Fig. 5

Discriminant analysis of principal components (DAPC)-based geographical distributions by the “Adegenet” function in “Poppr” package in R program 4.2.1. a–c correspond to the DAPC-based assignment in group of counties group of prefecture and group of province respectively when K = 2, and d–f correspond to the DAPC-based assignment in group of counties, group of prefecture and group of provinces respectively when K = 3