Figure 2.

(a) Principle component analysis (PCA) and (c) ancestry coefficients for n = 283 brown rats (Rattus norvegicus) collected in Haida Gwaii, BC. PCA was performed using the R‐package SNPRelate v1.16.0 (Zheng et al., 2012), and ancestry coefficients (k = 9) were estimated using sparse non‐negative matrix factorization implemented by the R‐package LEA v2.4.0 (Frichot & François, 2015). Three regionally distinct clusters were identified indicated by the coloured ovals on (a) and (b) and by coloured brackets on (c). The single sample from Titul Island was included in the “Kunga” label, and the single sample from the Rainy Islands was included in the “E‐Kunghit” label to increase readability