Field evaluation of an avian risk assessment model
Environmental Toxicology and Chemistry
6574_Vyas.pdf
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Abstract
We conducted two laboratory subacute dietary toxicity tests and one outdoor subacute dietary toxicity test to determine the effectiveness of the U.S. Environmental Protection Agency's deterministic risk assessment model for evaluating the potential of adverse effects to birds in the field. We tested technical-grade diazinon and its D Z N- 50W (50% diazinon active ingredient wettable powder) formulation on Canada goose (Branta canadensis) goslings. Brain acetylcholinesterase activity was measured, and the feathers and skin, feet. and gastrointestinal contents were analyzed for diazinon residues. The dose-response curves showed that diazinon was significantly more toxic to goslings in the outdoor test than in the laboratory tests. The deterministic risk assessment method identified the potential for risk to birds in general, but the factors associated with extrapolating from the laboratory to the field, and from the laboratory test species to other species, resulted in the underestimation of risk to the goslings. The present study indicates that laboratory-based risk quotients should be interpreted with caution.
Suggested Citation
Vyas, N., Spann, J.W., Hulse, C., Borges, S., Bennett, R., Torrez, M., Williams, B., Leffel, R., 2006, Field evaluation of an avian risk assessment model: Environmental Toxicology and Chemistry, v. 25, no. 7, p. 1762-1771.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Field evaluation of an avian risk assessment model |
| Series title | Environmental Toxicology and Chemistry |
| Volume | 25 |
| Issue | 7 |
| Year Published | 2006 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 1762-1771 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Environmental Toxicology and Chemistry |
| First page | 1762 |
| Last page | 1771 |