Figure 2.

Variation in estimated density of three life stages of the sheep tick (Ixodes ricinus) across 20 forest plots in the Netherlands, estimated with drag sampling, in relation to the passage rates of medium- to large-sized mammals in the same plots. Graphs show the first two axes of a principal component analysis (PCA) of differences in tick density across plots by life stage (orange vectors), correlated with the passage rates of host species (A), and taxonomic groups of vertebrates (B) (black vectors). Symbols as in Figure 1.