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Abstract
Ambient temperature and season have been observed to influence the toxicity of several environmental pollutants in homeotherms. The circannual toxicity of ethyl parathion (EP) was examined in adult European starlings (Sturnus vulgaris). Groups of birds housed in outdoor pens received oral doses of EP (20-150 mg/kg body weight) in fall, winter, spring and summer (temperature range -3.3 to 36.7?C). The median lethal dosage (LD50), and brain and plasma cholinesterase inhibition, were found to be quite similar among seasons. There was some suggestion that EP may have been more toxic during hot weather (winter versus summer LD50 estimate [95% confidence interval]:160 [114-225] vs. 118 [102-136] mg/kg; P<0.10). In view of previous reports in which ambient temperature extremes and harsh weather have enhanced organophosphorus insecticide toxicity to birds, it is concluded that circannual toxicity studies should include measures of sensitivity (acute oral exposure) and vulnerability (dietary exposure) to better predict responses of free-ranging birds
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Absence of circannual toxicity of parathion to starlings |
| Series title | Society of Environmental Toxicology and Chemistry, annual meeting abstract book |
| Volume | 11 |
| Year Published | 1990 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 205 (abstract no. P359) |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Society of Environmental Toxicology and Chemistry, annual meeting abstract book |
| First page | 205 (abstr |
| Google Analytic Metrics | Metrics page |