Abstract
Fungicide usage has increased globally in response to the rise in fungal pathogens, especially in the agricultural sector. However, research examining the toxicity of fungicides is still limited for many aquatic species. In this study, we examined the acute toxicity of two widely used fungicides, chlorothalonil and pyraclostrobin, on six North American larval amphibian species across multiple families using 96-h LC50 tests. We found that pyraclostrobin was approximately 3.5x more toxic than chlorothalonil; estimated LC50 values ranged from 5–18 µg/L for pyraclostrobin and 15–50 µg/L for chlorothalonil. Comparing across amphibian groups, we found that salamanders were 3x more sensitive to pyraclostrobin than anuran species and equally as sensitive to chlorothalonil. Notably, our estimated LC50 values within the range of the expected environmental concentration for these fungicides suggesting environmental exposures could lead to direct mortality in these species. Given the widespread and increasing usage of fungicides, additional work should be conducted to assess the general risk posed by these chemicals to amphibian and their associated aquatic habitats.
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Acknowledgements
We thank R. Rackliffe, D. Jones, M. Lech, and L. Billet for their assistance with the project and members of the Hoverman Lab for comments that helped to improve the manuscript. All methods were approved by the Purdue University IACUC (protocol # 1304000846). Animals were collected under Indian Department of Natural Resources permits #2548 and 3164.
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Hopkins, A.P., Hoverman, J.T. Acute aquatic toxicity of two commonly used fungicides to midwestern amphibian larvae. Ecotoxicology 32, 188–195 (2023). https://doi.org/10.1007/s10646-023-02629-8
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DOI: https://doi.org/10.1007/s10646-023-02629-8