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Biodynamic modelling and the prediction of accumulated trace metal concentrations in the polychaete Arenicola marina |
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| Authors: | M. Carmen Casado-Martinez Brian D. Smith Samuel N. Luoma |
| Affiliation: | a Department of Zoology, The Natural History Museum, Cromwell Rd, London SW7 5BD, UK b Unesco UNITWIN Wicop Chair, Department of Physical-Chemistry, University of Cadiz, Poligono Industrial Rio San Pedro s/n, C.P. 11510 Puerto Real (Cadiz), Spain c John Muir Institute of the Environment, University of California at Davis, Davis, CA 95616, USA |
| Abstract: | The use of biodynamic models to understand metal uptake directly from sediments by deposit-feeding organisms still represents a special challenge. In this study, accumulated concentrations of Cd, Zn and Ag predicted by biodynamic modelling in the lugworm Arenicola marina have been compared to measured concentrations in field populations in several UK estuaries. The biodynamic model predicted accumulated field Cd concentrations remarkably accurately, and predicted bioaccumulated Ag concentrations were in the range of those measured in lugworms collected from the field. For Zn the model showed less but still good comparability, accurately predicting Zn bioaccumulation in A. marina at high sediment concentrations but underestimating accumulated Zn in the worms from sites with low and intermediate levels of Zn sediment contamination. Therefore, it appears that the physiological parameters experimentally derived for A. marina are applicable to the conditions encountered in these environments and that the assumptions made in the model are plausible. |
| Keywords: | Ag Cd Zn Biodynamic model Deposit-feeder |
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