Migratory organisms present a challenge when predicting exposure to pesticides given their uneven distribution in time and space. We will present a spatially and temporally explicit framework for estimating the co-occurrence of juvenile salmon and agricultural pesticides in the Willamette Basin, Oregon. This framework incorporates information about patterns of juvenile salmon distribution, described in a companion presentation, which when considered along with information about patterns of pesticide concentrations can provide the basis for estimating potential exposure through direct contact. This framework also incorporates information about the spatial and temporal distribution of the salmon prey base, which when considered along with information about sensitivity of prey taxa to pesticides can provide the basis for estimating potential indirect effects. In both instances, we demonstrate that by using information about the distribution of juvenile salmon and their prey, the framework yields a better understanding of the proportion of organisms potentially impacted by agricultural pesticides.

Modeling the exposure of salmon to agricultural pesticides

242nd National Meeting (2011)

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