An epizootic of common loons in coastal waters of North Carolina : Concentrations of elemental contaminants and results of necropsies.
Tom Augspurger J. C. Franson Kathryn A. Converse Paul R. Spitzer Erica A. Miller
205 - 209
A 1993 die-off of common loons (Gavia immer) in the coastal waters of North Carolina was investigated with emphasis on comparing mercury, selenium, arsenic and lead between birds from the epizootic and reference specimens. Die-off specimens were emaciated with no ingested foreign bodies, and no lesions suggestive of infectious disease. Results of bacteriology, virology, parasitology, and botulism testing were unremarkable. The geometric mean concentrations (wet weight) of liver mercury (10.9 ppm), selenium (10.4 ppm), and arsenic (0.96 ppm) did not differ between specimens from the die-off and a sample of "reference" loons from the same area which died of other causes. Liver lead concentrations were ‹0.20 ppm in all but one sample (5.83 ppm). The geometric mean mercury concentration in the primary remiges of die-off specimens (5.44 ppm-dry weight) was significantly lower than in reference birds. Liver mercury significantly correlated with liver selenium on a molar concentration basis. We interpret the range of liver mercury concentrations in birds from the epizootic, similar liver mercury concentrations in reference loons, and higher mercury in reference loon feathers as evidence that factors other than mercury were primarily responsible for the emaciation diagnosed as the cause of mortality.
Environmental Toxicology and Chemistry
SETAC - Society of Environmental Toxicology and Chemistry
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