Ecological risk assessment for Pacific salmon exposed to dimethoate in California

A probabilistic risk assessment of the potential direct and indirect effects of acute dimethoate exposure to salmon populations of concern was conducted for 3 evolutionarily significant units (ESUs) of Pacific salmon in California. These ESUs were the Sacramento River winter‐run chinook, the Califor...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 2017-02, Vol.36 (2), p.532-543
Main Authors: Whitfield Aslund, Melissa, Breton, Roger L., Padilla, Lauren, Winchell, Michael, Wooding, Katie L., Moore, Dwayne R. J., Teed, R. Scott, Reiss, Rick, Whatling, Paul
Format: Article
Language:English
Subjects:
Acetylcholinesterase - metabolism
Animals
Brain - drug effects
Brain - enzymology
California
Computer Simulation
Dimethoate - analysis
Dimethoate - toxicity
Ecology
Endangered species
Environmental Monitoring - methods
Insecticides
Invertebrates - drug effects
Invertebrates - growth & development
Models, Biological
Oncorhynchus tshawytscha
Organophosphorus insecticide
Probabilistic risk assessment
Risk Assessment
Rivers - chemistry
Salmon
Salmon - growth & development
Salmon - physiology
Salmonidae
Soil and Water Assessment Tool model
Toxicity
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - toxicity
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Summary:A probabilistic risk assessment of the potential direct and indirect effects of acute dimethoate exposure to salmon populations of concern was conducted for 3 evolutionarily significant units (ESUs) of Pacific salmon in California. These ESUs were the Sacramento River winter‐run chinook, the California Central Valley spring‐run chinook, and the California Central Valley steelhead. Refined acute exposures were estimated using the Soil and Water Assessment Tool, a river basin–scale model developed to quantify the impact of land‐management practices in large, complex watersheds. Both direct effects (i.e., inhibition of brain acetylcholinesterase activity) and indirect effects (i.e., altered availability of aquatic invertebrate prey) were assessed. Risk to salmon and their aquatic invertebrate prey items was determined to be de minimis. Therefore, dimethoate is not expected to have direct or indirect adverse effects on Pacific salmon in these 3 ESUs. Environ Toxicol Chem 2017;36:532–543. © 2016 SETAC
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.3563