Additional file 4.

Laplacian Eigenfunction plot based on 230 AFLP loci among European herring gulls (L. argentatus). This file contains the two-dimensional plot of the two first Eigenvectors (and the percentage of the total variance they explain) of LAPEA on 109 herring gull individuals using all 230 AFLP loci. These LAPEA results independently confirmed the STRUCTURE results (see Figure 3). The four different colours in this LAPEA plot correspond with those in Figure 3. The first Eigenvector clearly separates the two ancestral populations indicated with blue and red from those indicated in green and yellow. The second Eigenvector provides a strong contrast between blue and red, and weakly differentiates green from yellow.

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