Figure 6. Plot of significant dbMEM and AEM vectors identified
in seascape genomic RDA analyses of Steromphala umbilicalis andNucella lapillus in the UK and Ireland. Symbols represent sampled
sites for this study, and colours correspond to similarity in
eigenvector values (black=high, grey=mid, white=low). The dbMEMs are
associated with large-scale spatial structure in the data, given by
their large eigenvalues (see also Figure S1). The dashed line in
dbMEM_2 corresponds to the relative positioning of the Forbes line,
demarcating the general northern limit of southern species within the UK
and Ireland (Forbes 1858).