Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

and written risk hypotheses (EPA 1998). Conceptual model diagrams are constructed to
illustrate potential pesticide exposure pathways and associated listed resources’
responses. An example of a conceptual model is presented in Figure 3 for Pacific
salmonids. In it, we illustrate where the pesticides generally reside in the environment
following application, how pesticides may co-occur with listed species and their habitats,
and how the individuals/habitat may respond upon exposure to them. In the case of
Pacific salmonids, we ascribe exposure and response to specific life stages of individuals
and then assess individual fitness endpoints sensitive to the action’s stressors.
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