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Article Dans Une Revue Proceedings of the Royal Society B: Biological Sciences Année : 2016

Local adaptation drives thermal tolerance among parasite populations: a common garden experiment

Résumé

Understanding the evolutionary responses of organisms to thermal regimes is of prime importance to better predict their ability to cope with ongoing climate change. Although this question has attracted interest in free-living organisms, whether or not infectious diseases have evolved heterogeneous responses to climate is still an open question. Here, we ran a common garden experiment using the fish ectoparasite Tracheliastes polycolpus, (i) to test whether parasites living in thermally heterogeneous rivers respond differently to an experimental thermal gradient and (ii) to determine the evolutionary processes (natural selection or genetic drift) underlying these responses. We demonstrated that the reaction norms involving the survival rate of the parasite larvae (i.e. the infective stage) across a temperature gradient significantly varied among six parasite populations. Using a Qst/Fst approach and phenotype–environment associations, we further showed that the evolution of survival rate partly depended upon temperature regimes experienced in situ, and was mostly underlined by diversifying selection, but also—to some extent—by stabilizing selection and genetic drift. This evolutionary response led to population divergences in thermal tolerance across the landscape, which has implications for predicting the effects of future climate change.

Dates et versions

hal-02962563 , version 1 (09-10-2020)

Identifiants

Citer

Elise Mazé-Guilmo, Simon Blanchet, Olivier REY, Nicolas Canto, Géraldine Loot. Local adaptation drives thermal tolerance among parasite populations: a common garden experiment. Proceedings of the Royal Society B: Biological Sciences, 2016, 283 (1830), ⟨10.1098/rspb.2016.0587⟩. ⟨hal-02962563⟩
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