Figure 1.

Map of all collection sites where the number of female crabs of at least one species (H. oregonensis and H. nudus) was sufficient to make comparisons of parasite burden between the historical and contemporary datasets (electronic supplementary material, table S1). Site locations are jittered slightly in the y- (i.e. latitudinal-) dimension to allow better visualization of nearby sites. Site names for each code are shown in the electronic supplementary material, table S1. (Online version in colour.)