Fig. 1: Map of the Alps with the locations of the 14 lakes.

G. Grosser, M. Mittlerer. The circles correspond to lakes Verney (blue), Alterne (purple) and Chamfèr (green) (18,38). Photo credits: Bretaye, Emines and Sangiatto: Christoph Schwörer; Sulzkar: Erich Weigand, Sulsseewli: Inger G. Alsos; all others, Sandra Garcés-Pastor. Source Data can be found in Supplementary Data 11. Map is drawn from data from Natural Earth.