Fig. 2.

Map showing the experimental location and step-wise magnetic displacements. The experiments were performed in Lund (Sweden) and the birds exposed to 5-day simulated stepwise displacements (white arrows) toward the final destinations in southern France (population-specific wintering grounds) and the northwestern Russia (at the northern limit of European species distribution). All displacements are 319 km long and lie on the rhumb line passing through the experimental site. Map is in Mercator projection and also reports magnetic intensity (I) and inclination (DIP) isolines as obtained by the eleventh International Geomagnetic Reference Field model (IGRF-11) for the 20th of October 2014. Locations' coordinates and magnetic values are given in Table 2.