Abstract
Increasing evidence suggests that phenotypic plasticity can play a critical role in ecotoxicology. More specifically, induced pesticide tolerance, in which populations exposed to a contaminant show increased tolerance to the contaminants later, has been documented in multiple taxa. However, the physiological mechanisms of induced tolerance remain unclear. We hypothesized that induced pesticide tolerance is the result of a generalized stress response based on previous studies showing that both natural stressors and anthropogenic stressors can induce tolerance to pesticides. We tested this hypothesis by first exposing larval wood frogs (Rana sylvatica) to either an anthropogenic stressor (sublethal carbaryl concentration), a natural stressor (cues from a caged predator), or a simulated stressor via exogenous exposure to the stress hormone corticosterone (125 nM). We also included treatments that inhibited corticosterone synthesis with the compound metyrapone (MTP). We then exposed the larvae to a lethal carbaryl treatment to assess time to death. We found that prior exposure to 125 nM of exogenous CORT and predator cues induced tolerance to a lethal concentration of carbaryl through a slight delay in time to death. Pre-exposure to sublethal carbaryl, as well as MTP alone or in combination with predator cues, did not induce tolerance to the lethal carbaryl concentration relative to the ethanol vehicle control treatment. Our study provides evidence that pesticide tolerance can be induced by a generalized stress response both in the presence and absence (exogenous CORT) of specific cues and highlights the importance of considering physiological ecology and environmental context in ecotoxicology.
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Acknowledgements
We thank S. Abercrombie, N. Buss, T. DeBlieux, D. DiGiacopo, M. Gannon, H. Howard, J. Hua, M. Iacchetta, J. Jaeger, and R. Relyea for their invaluable help in executing this study. We also thank T. DeBlieux, R. Flynn, M. Iacchetta, and D. Rackliffe for their comments on earlier drafts of the manuscript.
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This research was funded in part by a National Science Foundation grant (DEB-1655156) to JTH.
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All methods were approved by the Purdue University IACUC (protocol 1701001530). Animals were collected under Pennsylvania Scientific Collector Permit # 2018-01-0083.
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Billet, L.S., Hoverman, J.T. Pesticide tolerance induced by a generalized stress response in wood frogs (Rana sylvatica). Ecotoxicology 29, 1476–1485 (2020). https://doi.org/10.1007/s10646-020-02277-2
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DOI: https://doi.org/10.1007/s10646-020-02277-2