Additional file 1.
Figure A1: Map of the study locations. Colors correspond to geographical regions as on network figures. Blue is America, brown is North Sea, yellow is the Channel, red is Northwest Iberia, green is South Portugal and black is Azores/Canary/Morocco. East America, North Sea, the Channel and Northwest Iberia are sympatric sites while the others are allopatric. See Table A1 for precise locations.
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Moalic et al. BMC Evolutionary Biology 2011 11:33 doi:10.1186/1471-2148-11-33