Figure 1. (a) Study areas (n = 26 locations) located in the alpine and arctic regions of Fennoscandia in northern Europe where small rodents have been snap-trapped in fall ≥ 10 consecutive years. Locations denoted with * are exceptions (trapping conducted only in spring or/and summer or with gaps in the respective time-series; see details in Table 1). (b) Community contribution of rodent genera within each location: the grey-sided vole (Myodes rufocanus; blue bars); Norwegian lemming (Lemmus lemmus ; grey bars); field vole (Microtus agrestis ) and tundra vole (Microtus oeconomu s) (the last two combined asMicrotus -species; orange bars); and other species (green bars) encompassing the bank vole (Myodes glareolus ), red-backed vole (Myodes rutilus ) and wood lemming (Myopus schisticolor ).