Cadmium biodynamics in the oligochaete Lumbriculus variegatus and its implications for trophic transfer.

摘要: It has become increasingly apparent that diet can be a major source of trace metal bioaccumulation in aquatic organisms. In this study, we examined cadmium uptake, efflux, and subcellular compartmentalization dynamics the freshwater oligochaete Lumbriculus variegatus. L. variegatus is an important component food webs Europe North America potentially useful as standard for laboratory-based trophic transfer studies. Cadmium accumulation depuration were each followed 10 days. Rate constants uptake (ku) efflux (ke) estimated Cd was over course efflux. The partitioning into operationally-defined compartments relatively consistent throughout 20-day experiment, with majority accumulating cytosol. No changes observed or depuration, but there appeared to some exchange between heat-stable heat-labile cytosolic protein fractions. from solution strongly affected by ambient calcium concentrations, suggesting competition Ca sites. Finally, demonstrate ability manipulate whole body content potential tool examining influences on dietary dynamics. species conduit higher levels discussed, along its standardized © 2007 Elsevier B.V. All rights reserved.