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(a) Map of Iceland showing the locations of each of the Arctic charr populations studied: Álftavatn (A); Straumsvík (S); Hrauná (H), Sílatjörn (J), Kaldárbotnar (K), Silungapollur (P) and Miðhúsaskógur (M). (b) Dwarf charr from Álftavatn. (c) Dwarf charr from Straumsvík. (d) Hrauna, a spring-fed stream habitat, (e) Straumsvík, a spring-fed pond habitat and (f) Straumsvík substratum showing the network of spring-fed volcanic lava fissures.
