Additional file 5.

Laplacian Eigenfunction plot based on 230 AFLP loci among great black-backed gulls (L. marinus). This file contains the two-dimensional plot of the two first Eigenvectors (and the percentage of the total variance they explain) of LAPEA on 32 Palaearctic and 32 Nearctic marinus. Also in marinus LAPEA results correspond with those from STRUCTURE (see figure 4). The four different colours in this LAPEA plot correspond with those in Figure 4. The first Eigenvector clearly separates individuals carrying contributions from the ancestral population indicated by pale orange from those carrying contributions from the ancestral population indicated with pale green. The first Eigenvector also separates (although less strongly), the individuals carrying contributions from the two less distinct ancestral populations (pale red and pale blue). The second Eigenvector separates individuals carrying contributions from the two ancestral populations indicated by pale orange and pale green from those carrying contributions from the other two ancestral populations (indicated with pale red and pale blue).

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Sternkopf et al. BMC Evolutionary Biology 2010 10:348   doi:10.1186/1471-2148-10-348