Abstract
Heavy metal bioaccumulation models are important for interpreting water quality data, predicting bioaccumulation in organisms, and investigating the provenance of contaminants. To date they have been predominantly used as single-issue models, under steady-state conditions and in isolation of the biogeochemical processes that control metal bioaccumulation. Models that incorporate these processes would allow a more holistic approach to bioaccumulation modeling and contaminant assessment; however, this has been rarely undertaken, probably because it requires the integration of inter-disciplinary areas. In this study, we have developed such a model that integrates three key multi-disciplinary areas (biological, metal speciation, and bioaccumulation processes) and responds to variations in temporal external and internal forcing. Furthermore, spatial context is provided by developing the model within a simple hydrodynamic box-modeling framework. The calibrated model was able to predict with reasonable accuracy the temporal and spatial trends of soft-tissue copper bioaccumulation in a coastal oyster. This exploratory model was also used to highlight the importance of phytoplankton as an important vector of copper uptake dynamics by an oyster, therefore reinforcing the importance of the integrated approach. Finally, our model provides a framework for greater application beyond this specific example such as in the areas of waterway restoration, which has been shown to be an important area of ecological and environmental research.
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Acknowledgments
We thank the CRC for Coastal Zone Estuary and Waterway Management for providing financial assistance. We are also grateful to the Ecosystem Health Monitoring Program (EHMP) project team for their help in providing access to EHMP water quality data. Finally we thank the comments of two anonymous reviewers who significantly strengthened this manuscript.
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RGR conceived and designed study, performed research, analyzed data, contributed model and wrote the paper. MC conceived and designed study, performed research, analyzed data, contributed model and wrote the paper. RT performed research, analyzed data and assisted in writing the paper.
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Richards, R.G., Chaloupka, M. & Tomlinson, R. Towards an Integrated Ecosystem-Based Bioaccumulation and Metal Speciation Model. Ecosystems 13, 1303–1318 (2010). https://doi.org/10.1007/s10021-010-9392-8
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DOI: https://doi.org/10.1007/s10021-010-9392-8