Comparative Evaluation of Models for Chemical Risk Assessment. D. Nielsen, Exponent Environmental Group
Different types of models can potentially be applied to assess the ecological risks from introduction of man-made chemicals. Analyses of the theoretical advantages and disadvantages of different modeling approaches can guide the selection of an appropriate model. However, evaluation of the actual impact of different modeling approaches, when applied to real sites with chemical exposures, can provide some additional practical lessons regarding the relative advantages of different models. A series of such comparative evaluations have been conducted at case study sites. Effects-extrapolation, population, food web, and spatially explicit ecosystem models have all been applied in such a way as to estimate chemical effects on ecological endpoints. Evaluation of the results of applying these different modeling approaches provides lessons for future selection and application of chemical risk assessment models.
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