Fig. 2.

Characteristics of Norrbotten’s boreal forest in the reindeer winter grazing area. a Area coverage of forest age classes. b Selection index W _i for forest age classes, indicating forest age classes that are preferred by reindeer. The index is derived by the equation: W _i = [(% area covered by forest age class i in the areas preferred by reindeer)/(% area covered by forest age class i in the entire study area)]. Values larger than 1 indicate preference (light bars), values less than 1 indicate avoidance (grey bars). See 10.1007/s13280-015-0757-2 for further details