Fig. 2From: Breaking down population density into different components to better understand its spatial variationCorrelation circles of the principal component analysis included the 10 environmental variables describing each study site (Suit.area and all variables described in Additional file 4) and a the adult badger density (DAd) with the seven variables used in Eq. 1 or b the badger density (DBad) with the seven variables used in Eq. 2. The sum of the eigenvalues for the first three axes of the PCAs accounted for a 66% and b 69% of the total variabilityBack to article page