Fig. 3. Relation between HSI scores and Capercaillie habitat preference at the sample plot level for individual study areas. In all areas, mean HSI scores and Ivlev´s electivity index were correlated across the five classes of summer habitat suitability (weighted least square linear regressions; Pearson´s R²); differences between study areas were nonsignificant (see Results: Habitat preferences). Data points are color-coded for the different study areas. In study areas 2 and 4, Capercaillie signs had been too rare for individual analysis.