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Controlled food-chain transfer of dieldrin residues from phytoplankters to clams
Authors:S. R. Petrocelli  J. W. Anderson  A. R. Hanks
Affiliation:1. Department of Biology, Texas A&M University, College Station, Texas, USA
2. Bionomics Marine Laboratory Rt. 6, Box 1002, 32507, Pensacola, Florida, USA
3. Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA
Abstract:The marine phytoplankter Dunaliella peircei was exposed to a concentration of 10.00μg/l of the chlorinated hydrocarbon insecticide dieldrin in sea-water solution. After 24 h exposure, the dieldrin residue level in the alga was 12.10μg/g, corresponding to a magnification factor of 1210. Clams, Rangia cuneata, allowed to feed on dieldrin-contaminated phytoplankters for 48 h exhibited a magnification of dieldrin residues in tissues up to 54 times greater than the concentration resulting from the resuspension of contaminated algal cells in clean seawater. This study demonstrates the transfer of dieldrin residues in a two-level food chain, i.e., from a contaminated alga to a bivalved mollusc allowed to feed on this alga.
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