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Maps of the two regions studied, Switzerland and northern Norway (insets on the left), with lakes sampled in each region color-coded (enlarged maps: Suohpatjávri, blue; Langfjordvatn, yellow; Bienne, orange; Walen, pink; Thun, dark orange; Brienz, dark green). European whitefish species/ecotypes illustrations are accompanied by black parasite silhouettes showing the number of Proteocephalus fallax specimens genotyped from each host species. Two-letter country codes for reference.
