Fig. 1

Principal Component Analysis of transcriptome-wide abundance patterns in dependence of sex and host. Principal Component 1 (PC1), explaining the majority of variance, separates the parasite sexes in barbel. Principal Component 2 (PC2) separates worms from different hosts. Dots are colored based on groups (female/male worms from barbel/eel). Each dot represents one worm, with five worms per group. Graphical symbols at the right refer to the host the worms were taken from (barbel, eel) with the sex of the worms indicated by the coloring blue for male and pink for female worms (BF: female worms from barbel, BM: male worms from barbel, EM: male worms from eel, EF: female worms from eel)