Mathieu-Bégné, E. (2020). Mécanismes d'infection de l'ectoparasite de poissons d'eau douce Tracheliastes polycolpus. Mechanisms of infection of the freshwater fish ectoparasite Tracheliastes polycolpus. Thèse de doctorat, Université Toulouse 3 - Paul Sabatier, Toulouse, France. 209 pp. [In French and English] Compilation of several papers.

474170

Mathieu-Bégné, E.

2020

209 pp. [In French and English] Compilation of several papers

Publication

https://www.researchgate.net/publication/344809496_Mecanismes_d'infection_de_l'ectoparasite_de_poissons_d'eau_douce_Tracheliastes_polycolpus

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What are the ecological evolutionary mechanisms governing species interactions? I addressed this issue considering the interaction between the parasite Tracheliastes polycolpus and several of its cyprinid hosts. First, I highlighted the role of the environment at a very fine spatial scale (few hundred meters) on the encountering rate between this parasite and its hosts. At larger spatial scale (France) I illustrated the limiting role of resistance of host populations on the distribution of T. polycolpus. I further showed that T. polycolpus manages to infect different host species by relying on a plastic expression of its genes. Finally, I showed that host bacterial communities change after T. polycolpus infection in a co-infection dynamics with the parasite. Through the deployment of various and complementary approaches, it appears that both environmental factors, factors related to the host, to the parasite and to their associated bacterial communities contribute to the success of an intimate interaction such as parasitism.

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