Salinity is increasing in aquatic ecosystems in the Mediterranean region due to global change, and this is likely to have an important impact on host-parasite interactions. Here the relationships between infection by ectoparasitic water mites and salinity variation, on survival and fecundity of water boatmen Corixidae from Doñana National Park was studied in the laboratory. Larvae of Sigara lateralis parasitised by larval mites (Hydrachna skorikowi) had lower survivorship, and failed to moult...