Fisher, N. S.. Marine Sciences Research Center, nfisher@notes.cc.sunysb.edu
Wang, W. S.. Marine Sciences Research Center,
Stupakoff, I. Marine Sciences Research Center,
Sanudo-Wilhelmy, S. Marine Sciences Research Center,
Teyssie, J. IAEA Marine Ecology Laboratory,
Fowler, S. W.. IAEA Marine Environment Laboratory,
Crusius, J. IAEA Marine Environment Laboratory,

 
MODELING AND MEASURING METAL ACCUMULATION IN MARINE COPEPODS
 
To test predictions of a kinetic model regarding metal concentrations in marine zooplankton, we analyzed Cd, Zn, Ag, Co, and Se in surface water, phytoplankton, and zooplankton samples collected in the Mediterranean. Dissolved metal concentrations in surface waters from 10 stations averaged 10.5 +/- 2.4 pM for Ag, 72.3 +/- 16.2 pM for Cd, 260 +/- 43 pM for Co, and 4.3 +/- 1.6 nM for Zn. Kd values for suspended particles were not affected by particle load or phytoplankton abundance and were on the order of 1 e5 for Co, 3 e4 for Ag, 1 e4 for Zn, and 8 e3 for Cd. Mean concentrations in copepods (nmol/g dry wt) were, with the exception of Cd, close to concentrations predicted by a bioenergetic-based kinetic model which used experimentally determined assimilation efficiencies, influx rates from food and water, and efflux rates. This is the first field verification of a kinetic model of contaminant bioaccumulation in marine plankton. The close fit of predicted and measured values suggests that the model takes into account all the major factors which influence metal concentrations in these animals. Further, the model predicts that Se and Zn are obtained primarily from food and Ag, Cd, and Co are obtained about equally from food and water.
 
Day: Friday, Feb. 5
Time: 03:45 - 04:00pm
Location: Sweeney Center
 
Code: SS28FR0345S