title: Collateral damage: rapid exposure-induced evolution of pesticide resistance leads to increased susceptibility to parasites.
abstract: Although natural populations may evolve resistance to anthropogenic stressors such as pollutants, this evolved resistance may carry costs. Using an experimental evolution approach, we exposed different Daphnia magna populations in outdoor containers to the carbamate pesticide carbaryl and control conditions, and assessed the resulting populations for both their resistance to carbaryl as well as their susceptibility to infection by the widespread bacterial microparasite Pasteuria ramosa. Our results show that carbaryl selection led to rapid evolution of carbaryl resistance with seemingly no cost when assessed in a benign environment. However, carbaryl-resistant populations were more susceptible to parasite infection than control populations. Exposure to both stressors reveals a synergistic effect on sterilization rate by P. ramosa, but this synergism did not evolve under pesticide selection. Assessing costs of rapid adaptive evolution to anthropogenic stress in a semi-natural context may be crucial to avoid too optimistic predictions for the fitness of the evolving populations.
authors: Laboratory of Aquatic Ecology and Evolutionary Biology, Katholieke Universiteit Leuven, Ch. Deberiotstraat 32, 3000 Leuven, Belgium. Mieke.Jansen@bio.kuleuven.be
authors: Mieke
authors: M
authors: Jansen
authors: Robby
authors: R
authors: Stoks
authors: Anja
authors: A
authors: Coors
authors: Wendy
authors: W
authors: van Doorslaer
authors: Luc
authors: L
authors: de Meester
mesh_terms: D000818:Animals; D001530:Belgium; D005075:Biological Evolution; D012721:Carbaryl / Q000633:toxicity; D003621:Daphnia / Q000187:drug effects / Q000235:genetics* / Q000382:microbiology*; D005260:Female; D014644:Genetic Variation; D054884:Host-Pathogen Interactions; D007306:Insecticides / Q000633:toxicity; D058676:Pasteuria / Q000502:physiology; D012641:Selection, Genetic
chemical_list: D007306:Insecticides; D012721:Carbaryl