Parasites alter many traits of their hosts. In particular, parasites known as "manipulative" may increase their probability of transmission by inducing phenotypic alterations in their intermediate hosts. Although parasitic-induced alterations can modify species' ecological roles, the proximate factors modulating this phenomenon remain poorly known. As temperature is known to affect host-parasite associations, understanding its precise impact has become a major challenge in a context of global warming. Gammarids are ecologically important freshwater crustaceans and serve as intermediate hosts for several acanthocephalan species. These parasites induce multiple effects on gammarids, including alterations of their behavior, ultimately leading to modifications in their functional role. Here, experimental infections were used to assess the effect of two temperatures on several traits of the association between Gammarus pulex and its acanthocephalan parasite Pomphorhynchus laevis. Elevated temperature affected hosts and parasites in multiple ways (decreased host survival, increased gammarids activity, faster parasites development and proboscis eversion). However, behavioral manipulation was unaffected by temperature. These results suggest that predicted change in temperature may have little consequences on the trophic transmission of parasites through changes in manipulation, although it may modify it through increased infection success and faster parasites development. Abiotic conditions can strongly influence interspecific interactions and, ultimately, the dynamics of ecological communities. In direct connection with climate change, the understanding of such effect has become a major challenge in recent years 1-3. Abiotic conditions, including temperature, can, for instance, affect predator-prey interactions and food-web dynamics 4-6 or competition between species 7-11. They can also directly or indirectly affect host-parasite interactions 12-14 , with cascading effects for trophic interactions and ecosystem stability 15-17. This is all the more relevant in the case of parasite species that infest and modify the phenotype of host species known as 'ecosystem engineers' , i.e. species that can affect the physical properties of ecosystems 18-20. For instance, some recent evidence suggests that changes in temperature can modulate the influence of parasitic infection on both the functional role and the coexistence of crustacean amphipod species 17,21-23. Crustacean amphipods are widespread throughout a large range of freshwater habitats 24,25 , in which they play a key ecological role. They represent an important food resource for many species 26,27 and are themselves a major predator 24,28 , capable of modulating the composition of freshwater macroinvertebrates communities 28,29. Some species can also directly influence water quality and the recycling of organic matter through their shredder role on dead leaves 25,30-32. Crustacean amphipods serve as intermediate host for a large variety of helminths with complex