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Relationship Between Dietary Cadmium Absorption by Grass Shrimp (Palaemonetes pugio) and Trophically Available Cadmium in Amphipod (Gammarus lawrencianus) Prey

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Recent studies have shown that the transfer of metals along estuarine food chains may be directly related to the subcellular distribution of metal within prey, indicating that the qualification of whole tissue metal burdens may not serve as a reliable predictor of metal trophic transfer (Wallace and Luoma 2003; Seebaugh & Wallance 2004). For example, the partitioning of metal (e.g., Cd and Zn) to a subcellular compartment containing trophically available metal (TAM) (i.e., metal bound to heat-stable proteins [HSP - e.g., metallothioneins], heat-denatures proteins [HDP - e.g., 'enzymes'] and organelles) has been quantified for several aquatic invertebrates, including brine shrimp, oligochaetes and bivalves (Wallace et al. 1998; Wallace and Luoma 2003; Seebaugh and Wallace 2004).

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