Experimental food-chain studies to evaluate cadmium accumulation in amphibians
- ManTech Environmental Technology, Inc., Corvallis, OR (United States)
In order to more adequately address the uncertainty within the ecological risk assessment process, the authors completed a series of laboratory exposures with representative terrestrial (small herbivorous mammal) and wetland (amphibian) vertebrates for evaluating an validating relatively simple, linear food-chain models used in evaluating cadmium exposures in soils. Here, the authors summarize the work on food-chain contamination evaluations using laboratory feeding trials with amphibians. In these studies, frogs (Xenopuslaevis) were exposed to different metal-contaminated earthworm diets for 28 days. Earthworms (Eisenia foetida) used in these trials had been exposed to site-soils contaminated with cadmium, and following 28-day exposures to cadmium-contaminated worms, the frogs were killed and tissues were analyzed for total cadmium. No mortality or exposure related body weight changes were apparent in these feeding studies, but earthworm cadmium concentrations of 700 ppm were associated with elevated cadmium concentrations in livers of exposed frogs. In addition, female frogs had increased cadmium concentrations (relative to pair-fed controls) in their eggs.
- OSTI ID:
- 33573
- Report Number(s):
- CONF-9410273-; TRN: IM9518%%393
- Resource Relation:
- Conference: 15. annual meeting of the Society of Environmental Toxicology and Chemistry (SETAC), Denver, CO (United States), 30 Oct - 3 Nov 1994; Other Information: PBD: 1994; Related Information: Is Part Of Society of Environmental Toxicology and Chemistry 15th annual meeting: Abstract book. Ecological risk: Science, policy, law, and perception; PB: 286 p.
- Country of Publication:
- United States
- Language:
- English
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