Fig. 4

Analyses of spatial genetic structure using a Bayesian population assignment test with STRUCTURE for the five and 13 populations of C. hangiongensis and C. koreanus, respectively based on seven microsatellite loci. a The bar plot suggesting seven genetic clusters [K = 7: determined by LnP (D) = 148.671 and ΔK = 10.952] when the analysis was performed for C. hangiongensis and C. koreanus combined; b When the analysis was done separately for each species, all C. hangiongensis individuals were assigned to approximately equal proportions of the inferred three genetic clusters. However, the plot suggests eight genetic clusters [K = 8: LnP (D) = 220.347 and ΔK = 14.934] for C. koreanus. The x-axis represents each individual and the y-axis represents the probability of a given individual belonging to each of the genetic clusters. Population abbreviations as in text and Additional file 1: Table S1