Figure 1.

Schematic map of the egg burial locations within the Rhine drainage system in Switzerland. GPS coordinates are indicated. Dashed arrow indicates direction of water flow. Box in the upper-right indicates the location within Switzerland. Surface elevation is taken from the swissALTI3D Reliefschattierung (Bundesamt für Landestopografie;

Stelkens et al. BMC Evolutionary Biology 2012 12:247   doi:10.1186/1471-2148-12-247
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