Table 1. Details on sampling locations and the number of individuals collected in 2005 and 2010.
| Location | Morphotype | Code | Latitude | Longitude | 2005 | 2010 |
| Thingvallavatn | Large benthic | TH_LB | 64°11 | 21°08 | 30 | 17 |
| Thingvallavatn | Small benthic | TH_SB | 64°11 | 21°08 | 185 | 76 |
| Thingvallavatn | Planktivorous | TH_PL | 64°11 | 21°08 | 198 | 102 |
| Grimsnes | Anadromous | Gri_AN | 64°00 | 20°53 | 27 | |
| Birkilundur | Small benthic | Bir_SB | 64°01 | 20°57 | 30 | |
| Hvita | Anadromous | Hv_AN | 64°42 | 20°59 | 35 | |
| Trussa | Small benthic | Tr_SB | 64°43 | 20°46 | 29 | |
| Husafell | Small benthic | Hus_SB | 64°41 | 20°52 | 31 | |
| Lon | Anadromous | Lon_AN | 66°05 | 16°55 | 27 | |
| Grafarlond | Small benthic | Gr_SB | 65°15 | 16°09 | 31 | |
| Myvatn | Lake resident | My_LR | 65°37 | 17°03 | 34 | |
| Myvatn-Haganes | Small benthic | Hag_SB | 65°37 | 17°03 | 35 |