Can the evolution of Cd resistance in prey alter Cd bioavailability to a predator?
- State Univ. of New York, Stony Brook, NY (United States). Marine Sciences Research Center
The deposit feeding oligochaete, Limnodrilus hoffmeisteri, inhabiting a Cd polluted cove on the Hudson River (Foundry Cove) has evolved resistance to Cd. The worms` resistance is attributed to the binding of Cd to metallothionein-like proteins (MT) and metal-rich granules (MRG). Their research focuses on determining whether Cd detoxification by oligochaetes alters Cd bioavailability and trophic transfer to a representative predator, the omnivorous grass shrimp Palaemonetes. Cd resistant and nonresistant worms were radiolabeled with the radioisotope Cd-109. After exposure to the metal, worm subcellular Cd-109 distributions were determined through differential centrifugation and biochemical fractionation. Absorption of Cd-109 by shrimp fed the radiolabeled worms was also determined. The authors show that Cd resistant worms have 30% of their Cd stored in MRG and 11% in the cytosol; nonresistant worms have 2% and 56% stored respectively. Both populations have about 65% of the Cd in the cytosol bound to a heat-stable (MT) fraction. The authors demonstrate that differences in worm subcellular Cd distributions translate into large differences in Cd trophic transfer. Shrimp fed Cd resistant worms absorb 22% of the ingested Cd; shrimp fed nonresistant worms absorb 76%. Their research demonstrates that through the efficient storage of Cd into insoluble-unbioavailable MRG, evolution of Cd resistance has effectively suppressed the bioavailability and trophic transfer of Cd.
- OSTI ID:
- 211912
- Report Number(s):
- CONF-9511137-; ISBN 1-880611-03-1; TRN: IM9617%%228
- Resource Relation:
- Conference: 2. Society of Environmental Toxicology and Chemistry (SETAC) world conference, Vancouver (Canada), 5-9 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Second SETAC world congress (16. annual meeting): Abstract book. Global environmental protection: Science, politics, and common sense; PB: 378 p.
- Country of Publication:
- United States
- Language:
- English
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