WP4 Pesticides in Pacific Northwest (USA) Watersheds
204 Oregon Ballroom
1:20 PM - 4:40 PM, Wednesday
() A rule-based model for the development of community-level distributions that compare susceptibilities of aquatic macro-invertebrate assemblages to short and long-term pesticide impacts.
Jepson, Paul1, 2, Jenkins, J2, Peterson, J2, Heneghan, P2, 1 Integrated Plant Protection Center, Oregon State University, Corvallis, Oregon, USA2 Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon, USA
ABSTRACT- Simple rules were developed that discriminated the levels of short and long-term risk associated with the different body forms, functional feeding groups, behaviors and life histories of approximately 100 fresh-water macro-invertebrate species, colonizing Pacific Norwest streams. A series of indices were developed that enabled potential exposure, uptake, impact and population-level risks to be classified for each species. These classifications were aggregated to form frequency distributions, characteristic of different stream assemblages, based upon stream sampling. The frequency distributions varied between streams subject to differing levels of anthropogenic stress, and streams with different flow and habitat characteristics. This presentation will provide a detailed review of this method and the associated analyses, and it will discuss the implications of the analytical results for effective ecological risk assessment for pesticides in Pacific Northwest streams.
Key words: freshwater, macro-invertebrate, risk, pesticide