Abstract
This study was performed to evaluate the bioavailability and effects of lead in wildlife at a trap and skeet range. The total lead concentration in a composite soil sample (pellets removed) was 75,000 μg/g dry weight. Elevated tissue lead concentrations and depressed ALAD activities in small mammals and frogs indicate that some of the lead deposited at the site is bioavailable. Mean tissue lead concentrations (μg/g dry wt.) in white-footed mice (Peromyscus leucopus) at the range liver=4.98, kidney=34.9, femur=245) were elevated (P<0.01) 5- to 64-fold relative to concentrations in mice from a control area. Tissue lead concentrations in the only shorttail shrew (Blarina brevicauda) captured at the range (liver=34.1, kidney=1506, femur=437) were elevated 35- to 1038-fold. Femur lead concentrations in green frogs (Rana clamitans) at the range (1,728 μg/g) were elevated nearly 1000-fold, and the lead concentration in a pooled kidney sample (96.2 μg/g) was elevated 67-fold. There was significant depression of blood ALAD activity in mice (P=0.0384) and depression of blood and liver ALAD activity in frogs (P<0.001). Hematological and histopathological lesions associated with lead toxicosis were observed in some animals. Hemoglobin concentrations were reduced 6.7% in mice (P=0.0249), but hematocrit was not significantly affected in mice or frogs. Intranuclear inclusions were present in the renal proximal tubular epithelium of two of the mice and the shrew that were captured at the range, and necrosis of the tubular epithelium was also evident in one of the mice. Kidney:body weight ratios were similar in range and control mice. Soil ingestion may be a significant route of lead uptake in small mammals at the range. However, the tendency of lead to concentrate in the bones rather than in more digestible soft tissues may minimize food chain uptake of lead by predators, especially raptors that regurgitate undigestible material.
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Stansley, W., Roscoe, D.E. The uptake and effects of lead in small mammals and frogs at a trap and skeet range. Arch. Environ. Contam. Toxicol. 30, 220–226 (1996). https://doi.org/10.1007/BF00215801
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DOI: https://doi.org/10.1007/BF00215801