Figure 2

Wild Mexican populations show greater allelic richness in both (a) A. splendens (Kruskal–Wallis: H_3,16=9.66, P<0.02) and (b) Z. tequila (Kruskal–Wallis: H_2,18=12.69, P=0.002). Median values and the first and third inter-quartile ranges are plotted.