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Absence of circannual toxicity of parathion to starlings

Society of Environmental Toxicology and Chemistry, annual meeting abstract book

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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

Additional Publication Details

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
First page:
205 (abstr