Additional file 6.

Laplacian eigenfunction plot based on 230 AFLP loci among glaucous gulls (L. hyperboreus) and North American herring gulls (L. smithsonianus). 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 hyperboreus, 35 Nearctic hyperboreus, and 35 Nearctic smithsonianus. These LAPEA results correspond with those from STRUCTURE (see figure 5). The three different colours in this LAPEA plot correspond with those in Figure 5. The first Eigenvector clearly separates individuals carrying contributions from the ancestral population indicated by pale yellow from those carrying contributions from the ancestral populations indicated with red and pale blue. The The second Eigenvector separates individuals carrying contributions from the two ancestral populations indicated by pale yellow and red from those carrying contributions from the ancestral population indicated with pale blue.

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