Figure 4: Redundancy analysis (RDA) biplot representing the output of an RDA performed on allele frequency data from 89 Dodonaea viscosa ssp. angustissima samples from 17 populations.

Open circles represent the ordinated allele frequencies (response variable); Red arrows represent spatial polynomials (explanatory variables) plotted as vectors. 58% of the total variation in the genetic data was constrained by the spatial explanatory variables. Of this constrained variation, 33% (p = 0.001) was constrained by axis one (RDA1), and 14% (p = 0.007) by axis two (RDA2). Significance of RDA was assessed using an analysis of variance (ANOVA).