Cestodes change the isotopic signature of brine shrimp, Artemia, hosts: Implications for aquatic food webs

► Tapeworms induce strong changes in isotopic signatures of their hosts. ► Infected and uninfected Artemia are not equivalent from a trophic point of view. ► New avenues for research in trophic ecology and diets of birds are identified. ► The importance of considering the parasitic status of invertebrate prey is highlighted.