Figure 4 in A review of the subspecies status of the Icelandic Purple Sandpiper Calidris maritima littoralis

Figure 4. Discriminant analysis of principal components based on multilocus sequence data for Calidris maritima from Canada, Iceland, and Svalbard. The first two principal axes are shown, with the first plotted on the vertical axis. The relative contribution of the two axes is shown in the panel. Ellipses are inertia ellipses calculated by the variance of both principal component axes, and represent 67% of the variance (Jombart et al., 2010).