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Questions concerning the potential impact of glyphosate‐based herbicides on amphibians
Courtesy of John Wiley & Sons, Ltd.
Use of glyphosate‐based herbicides is increasing worldwide. Here we review the available data related to potential impacts of these herbicides on amphibians and conduct a quantitative meta‐analysis. Because only a little is known about environmental concentrations of glyphosate in amphibian habitats, and virtually nothing about environmental concentrations of the substances added to the herbicide formulations that mainly contribute to adverse effects, glyphosate levels can only be seen as approximations for contamination with glyphosate‐based herbicides. The impact on amphibians depends on the herbicide formulation with different sensitivity of taxa and life‐stages. Effects on development of larvae apparently are the most sensitive endpoints to study. As with other contaminants, co‐stressors mainly increase adverse effects. If and how glyphosate‐based herbicides and other pesticides contribute to amphibian decline is not answerable yet due to missing data on how natural populations are affected. Amphibian risk assessment can only be conducted case‐specifically, with consideration of the particular herbicide formulation. We recommend for better monitoring of both amphibian populations and contamination of habitats with glyphosate‐based herbicides, not just glyphosate, and we suggest including amphibians in standardized test batteries to study at least dermal administration. Environ Toxicol Chem © 2013 SETAC
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