Article

Archives of Environmental Contamination and Toxicology

, Volume 65, Issue 3, pp 598-610

Toxic Exposure of Songbirds to Lead in the Southeast Missouri Lead Mining District

  • W. Nelson BeyerAffiliated withUnited States Geological Survey, Patuxent Wildlife Research Center Email author 
  • , J. Christian FransonAffiliated withUnited States Geological Survey, National Wildlife Health Center
  • , John B. FrenchAffiliated withUnited States Geological Survey, Patuxent Wildlife Research Center
  • , Thomas MayAffiliated withEnvironmental Chemistry Branch, Columbia Environmental Research Center
  • , Barnett A. RattnerAffiliated withUnited States Geological Survey, Patuxent Wildlife Research Center
  • , Valerie I. Shearn-BochslerAffiliated withUnited States Geological Survey, National Wildlife Health Center
  • , Sarah E. WarnerAffiliated withUnited States Fish and Wildlife Service
  • , John WeberAffiliated withUnited States Fish and Wildlife Service
  • , David MosbyAffiliated withUnited States Fish and Wildlife Service

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Abstract

Mining and smelting in the Southeast Missouri Lead Mining District has caused widespread contamination of soils with lead (Pb) and other metals. Soils from three study sites sampled in the district contained from approximately 1,000–3,200 mg Pb/kg. Analyses of earthworms [33–4,600 mg Pb/kg dry weight (dw)] collected in the district showed likely high Pb exposure of songbirds preying on soil organisms. Mean tissue Pb concentrations in songbirds collected from the contaminated sites were greater (p < 0.05) than those in songbirds from reference sites by factors of 8 in blood, 13 in liver, and 23 in kidney. Ranges of Pb concentrations in livers (mg Pb/kg dw) were as follows: northern cardinal (Cardinalis cardinalis) = 0.11–3.0 (reference) and 1.3–30 (contaminated) and American robin (Turdus migratorius) = 0.43–8.5 (reference) and 7.6–72 (contaminated). Of 34 adult and juvenile songbirds collected from contaminated sites, 11 (32 %) had hepatic Pb concentrations that were consistent with adverse physiological effects, 3 (9 %) with systemic toxic effects, and 4 (12 %) with life-threatening toxic effects. Acid-fast renal intranuclear inclusion bodies, which are indicative of Pb poisoning, were detected in kidneys of two robins that had the greatest renal Pb concentrations (952 and 1,030 mg/kg dw). Mean activity of the enzyme delta-aminolevulinic acid dehydratase (ALAD) in red blood cells, a well-established bioindicator of Pb poisoning in birds, was decreased by 58–82 % in songbirds from the mining sites. We conclude that habitats within the mining district with soil Pb concentrations of ≥1,000 mg Pb/kg are contaminated to the extent that they are exposing ground-feeding songbirds to toxic concentrations of Pb.