Two-dimensional MDS ordination plot based on similarity in trematode community structure. A. Reduced dataset for larval communities in R . auricularia (blue triangles) and L . stagnalis (red triangles). B . R . auricularia dataset including all samples of more than 10 snails. Reservoir of origin indicated by different colour. Abbreviations: B, Baldeneysee; Ha, Harkortsee; He, Hengsteysee; K, Kemnader See.