biostudies-literatureUnknown148(4)Bommarito CTrematode prevalence and abundance in hosts are known to be affected by biotic drivers as well as by abiotic drivers. In this study, we used the unique salinity gradient found in the south-western Baltic Sea to: (i) investigate patterns of trematode infections in the first intermediate host, the periwinkle Littorina littorea and in the downstream host, the mussel Mytilus edulis, along a regional salinity gradient (from 13 to 22) and (ii) evaluate the effects of first intermediate host (periwinkle) density, host size and salinity on trematode infections in mussels. Two species dominated the trematode community, Renicola roscovita and Himasthla elongata. Salinity, mussel size and density of infected periwinkles were significantly correlated with R. roscovita, and salinity and density correlaParasitology486-494https://www.ebi.ac.uk/biostudies/studies/S-EPMC7938341biostudies-literatureEffects of first intermediate host density, host size and salinity on trematode infections in mussels of the south-western Baltic Sea.PMC7938341Pranovi FBarboza FRWahl MPansch CBommarito CThieltges DWfalseEffects of first intermediate host density, host size and salinity on trematode infections in mussels of the south-western Baltic Sea.Trematode prevalence and abundance in hosts are known to be affected by biotic drivers as well as by abiotic drivers. In this study, we used the unique salinity gradient found in the south-western Baltic Sea to: (i) investigate patterns of trematode infections in the first intermediate host, the periwinkle Littorina littorea and in the downstream host, the mussel Mytilus edulis, along a regional salinity gradient (from 13 to 22) and (ii) evaluate the effects of first intermediate host (periwinkle) density, host size and salinity on trematode infections in mussels. Two species dominated the trematode community, Renicola roscovita and Himasthla elongata. Salinity, mussel size and density of infected periwinkles were significantly correlated with R. roscovita, and salinity and density correla2021-01-01T00:00:00Z2021 Apr2025-04-04T22:00:57.406Z2025-04-04T22:00:57.406ZS-EPMC79383413321353110.1017/S0031182020002188