Many regulatory authorities, including U.S. EPA and Canadian PMRA, are required to perform ecological risk assessments in order to evaluate the likelihood that adverse ecological effects may occur as a result of exposure to a pesticide. The credibility of these assessments and their value for informing environmental decisions is based on the ability to accurately predict environmental exposures, understand ecological effects, and extrapolate predicted effects to population, community, and ecological function metrics. Screening level risk assessments, often the first step in evaluating pesticide risk, are based on worst-case exposure and effects predictions from baseline tools and studies. The uncertainty and assumptions of these assessments can be evaluated with higher tier effects, modeling, and monitoring data in order to revise the assessment to better predict real-world situations and allow for more informed risk management decisions. In this presentation, higher tier evaluations of neonicotinoid aquatic invertebrate risk assessments will be described as a case study.

Evaluation of potential impacts of insecticides on aquatic invertebrates: Higher tier evaluations for risk management

256th National Meeting (2018)

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