Journal Article

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

Franson, J. Christian, May, Thomas, Mosby, David, Beyer, W. Nelson, Warner, Sarah E., Shearn-Bochsler, Valerie I., Weber, John, French, John B., Rattner, Barnett A.

2013

Overview

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.

• Publisher: Springer US,Springer,Springer Nature B.V
• Subject: analysis / Animal, plant and microbial ecology / Animals / Applied ecology / Aves / Biological and medical sciences / Birds / blood / Cardinalis cardinalis / Earth and Environmental Science / earthworms / Ecotoxicology / Ecotoxicology, biological effects of pollution / Effects of pollution and side effects of pesticides on vertebrates / Environment / Environmental Chemistry / Environmental Exposure / Environmental Health / Environmental Monitoring / enzyme activity / Enzymes / erythrocytes / Fundamental and applied biological sciences. Psychology / Geology / habitats / inclusion bodies / Indicator organisms / indicator species / Kidneys / Lead / Lead - analysis / Lead - blood / Lead - toxicity / liver / Mass Spectrometry / metabolism / Metallurgy / Metals, Heavy / Metals, Heavy - analysis / Metals, Heavy - blood / Metals, Heavy - toxicity / Mines / Mining / Mining industry / Missouri / Monitoring/Environmental Analysis / Oligochaeta / Oligochaeta - metabolism / Parks & recreation areas / Poisoning / Pollution / Sediments / soil / Soil contaminants / Soil contamination / Soil Pollutants / Soil Pollutants - analysis / Soil Pollutants - blood / Soil Pollutants - toxicity / Soil Science & Conservation / Songbirds / Songbirds - metabolism / Studies / Toxicity / Turdus migratorius / Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution / Wildlife