Principal components analysis (PCA) of microsatellite loci representing cat-, dog-, lynx-, wolf- and fox-derived mite populations in France, Switzerland, North Italy and Central Italy. Each population is labelled with the host species and the geographical origin. The eigenvalues of the two axes are displayed in the barplot on the left. Components PCA 1 and PCA 2 explained 11.3% and 7.9% of the variance, respectively (black bars of the eigenvalues, inset).