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Toxicity of Anacostia River, Washington, D.C., USA, sediment fed to mute swans (Cygnus olor)

Environmental Toxicology and Chemistry

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Abstract

Sediment ingestion is sometimes the principal route by which waterfowl are exposed to environmental contaminants, and at severely contaminated sites waterfowl have been killed by ingesting sediment. Mute swans (Cygnus olor) were fed a diet for 6 weeks with a high but environmentally realistic concentration (24%) of sediment from the moderately polluted Anacostia River in the District of Columbia, USA, to estimate the sediment's toxicity. Control swans were fed the same diet without the sediment. Five organochlorine compounds were detected in the treated diets, but none of 22 organochlorine compounds included in the analyses was detected in livers of the treated swans. The concentrations of 24 polynuclear aromatic hydrocarbons measured in the treated diet were as high as 0.80 mg/kg, and they were thought to have been responsible for the observed induction of hepatic microsomal monooxygenase activity in livers. A concentration of 85 mg/kg of lead in the diet was enough to decrease red blood cell ALAD activity but was not high enough to cause more serious effects of lead poisoning. The dietary concentrations of Al, Fe, V, and Ba were high compared to the concentrations of these elements known to be toxic in laboratory feeding studies. However, the lack of accumulation in the livers of the treated swans suggested that these elements were not readily available from the ingested sediment. We did not study all potential toxic effects, but, on the basis of those that we did consider, we concluded that the treated swans were basically healthy after a chronic exposure to the sediment.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Toxicity of Anacostia River, Washington, D.C., USA, sediment fed to mute swans (Cygnus olor)
Series title:
Environmental Toxicology and Chemistry
Volume
19
Issue:
3
Year Published:
2000
Language:
English
Contributing office(s):
National Wildlife Health Center
Description:
p. 731-735
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
731
Last page:
735
Number of Pages:
5