Inducible pesticide tolerance in Daphnia pulex influenced by resource availability

Ecology and Evolution
Vanessa P WuerthnerGeorge A Meindl

Abstract

Pesticides are a ubiquitous contaminant in aquatic ecosystems. Despite the relative sensitivity of aquatic species to pesticides, growing evidence suggests that populations can respond to pesticides by evolving higher baseline tolerance or inducing a higher tolerance via phenotypic plasticity. While both mechanisms can allow organisms to persist when faced with pesticides, resource allocation theory suggests that tolerance may be related to resource acquisition by the organism. Using Daphnia pulex, we investigated how algal resource availability influenced the baseline and inducible tolerance of D. pulex to a carbamate insecticide, carbaryl. Individuals reared in high resource environments had a higher baseline carbaryl tolerance compared to those reared in low resource environments. However, D. pulex from low resource treatments exposed to sublethal concentrations of carbaryl early in development induced increased tolerance to a lethal concentration of carbaryl later in life. Only individuals reared in the low resource environment induced carbaryl tolerance. Collectively, this highlights the importance of considering resource availability in our understanding of pesticide tolerance.

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Citations

Sep 17, 2020·Ecotoxicology·Logan S Billet, Jason T Hoverman
Jun 4, 2020·Ecology and Evolution·Devin G DiGiacopo, Jessica Hua
May 13, 2021·Ecology and Evolution·Talles Bruno Oliveira Dos AnjosAndreu Rico
Oct 28, 2021·Environmental Science and Pollution Research International·Makoto IshimotaNaruto Tomiyama
Jan 19, 2022·Environmental Science and Pollution Research International·Alberto Romero-Blanco, Álvaro Alonso

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