Figure 2
Population genetic analyses of invasive G. affinis in mainland China. (a) Genetic structure among populations (see Table 1 for population codes). Individual assignment to two genetically distinct clusters using STRUCTURE168. Likelihood of assignment for each individual is shown as a vertical bar. (b) Bayesian inference of the number of genetically distinct clusters (K) among the 10 sampled populations using ΔK169. (c) Principal coordinate analysis (PCoA) showing genetic differentiation between populations according to the first two axes. Percent variance explained is given in parentheses. Triangles indicate positive values of the third axis (12.22% variance explained), while squares indicate negative values. Colors signify assignment to K = 2 genetically distinct clusters in STRUCTURE. (d) Neighbor-joining tree based on genetic distances (Nei’s DA). Numbers at nodes indicate bootstrap support; only values >70 are presented. (e) Correlation between genetic distance and geographic distance. A Mantel test on log-transformed pairwise genetic distances (FST-values) detected a significant effect of log-transformed geographic distances (Z = −103.73, r = 0.37, one-sided P = 0.014).
