Figure 2. Neutral genetic structure of the Arabian mangroves. (A) Plot of PC1 against PC2 (left panel) and of PC3 against PC4 (right panel) axes from a PCA based on selectively neutral genome-wide SNPs. Colors match those in Fig. 1. (B) SNMF analysis based on the same SNP set for K values 2 to 7. On each plot, individuals are represented by vertical bars, and colors correspond to the degree of shared ancestry for each genetic cluster.