TY - JOUR

T1 - Bioenhancement of cadmium transfer along a multi-level food chain

AU - Seebaugh, David R

AU - Goto, Daisuke

AU - Wallace, William G

PY - 2005/6/1

Y1 - 2005/6/1

N2 - Previous studies have shown that metal partitioned to a subcellular compartment containing trophically available metal (TAM) is readily available to predators and may be enhanced by increased binding of metal to heat-stable proteins (HSP - e.g., metallothioneins). The aim of the current investigation was to determine the influence of TAM on the trophic transfer of Cd along an experimental, three-level food chain: Artemia franciscana (brine shrimp)-->Palaemonetes pugio (grass shrimp)-->Fundulus heteroclitus (mummichog). P. pugio were fed for 7 days on A. franciscana exposed to Cd in solution (including (109)Cd as radiotracer) and subjected to subcellular fractionation or fed to F. heteroclitus. An HSP-driven increase in the percentage of Cd associated with TAM (TAM-Cd%) in A. franciscana exposed to 1 muM Cd resulted in a bioenhancement (i.e., a greater than linear increase with respect to A. franciscana exposure) of Cd trophic transfer to P. pugio. Increased dietary Cd exposure did not affect TAM-Cd% in P. pugio nor trophic transfer to F. heteroclitus.

AB - Previous studies have shown that metal partitioned to a subcellular compartment containing trophically available metal (TAM) is readily available to predators and may be enhanced by increased binding of metal to heat-stable proteins (HSP - e.g., metallothioneins). The aim of the current investigation was to determine the influence of TAM on the trophic transfer of Cd along an experimental, three-level food chain: Artemia franciscana (brine shrimp)-->Palaemonetes pugio (grass shrimp)-->Fundulus heteroclitus (mummichog). P. pugio were fed for 7 days on A. franciscana exposed to Cd in solution (including (109)Cd as radiotracer) and subjected to subcellular fractionation or fed to F. heteroclitus. An HSP-driven increase in the percentage of Cd associated with TAM (TAM-Cd%) in A. franciscana exposed to 1 muM Cd resulted in a bioenhancement (i.e., a greater than linear increase with respect to A. franciscana exposure) of Cd trophic transfer to P. pugio. Increased dietary Cd exposure did not affect TAM-Cd% in P. pugio nor trophic transfer to F. heteroclitus.

KW - Animals

KW - Artemia/chemistry

KW - Biological Availability

KW - Cadmium/pharmacokinetics

KW - Diet

KW - Food Chain

KW - Fundulidae

KW - Palaemonidae/chemistry

KW - Tissue Distribution

KW - Water Pollutants/pharmacokinetics

U2 - 10.1016/j.marenvres.2004.07.003

DO - 10.1016/j.marenvres.2004.07.003

M3 - Article

C2 - 15603770

VL - 59

SP - 473

EP - 491

JO - Marine Environmental Research

JF - Marine Environmental Research

SN - 0141-1136

IS - 5

ER -