Fig. 1
From: Small-scale phenotypic differentiation along complex stream gradients in a non-native amphipod
Map of our study areas. a Location of the Rhine catchment in Central Europe with the two studied tributaries: b Erft, which receives thermal pollution in the form of cooling water from several coal power plants and c Kinzig, which does not receive artificially heated cooling water. Locations and number codes of our 16 sampling sites are indicated (maps created with QGIS 3.4.2; the altitude layer was retrieved from https://lpdaac.usgs.gov)