Fig. 2

Population assignment of individuals by Bayesian clustering in structure. Membership coefficients for each individual are shown by vertical bars with the clusters represented by colours. The Evanno method selected K = 2 when no location prior was used and K = 3 when a location prior was used. When K = 3 the three clusters correspond to 1) the Falkland Islands and Crozet colonies, 2) the South Georgia colony, and 3) the Macquarie Island colony