Bioaccumulation model (WP5)

Objectives

A generic model for the trophic enrichment of stable toxins (GeMTEST) is being developed within this workpackage. Here, the contaminant tracing is incorporated into an end-to-end food web model of 27 functional groups common to the Baltic Sea ecosystem. The model is based on Baltic Sea data from year 1996 and includes the most important commercial fish species, cod (Gadus morhua), Baltic herring (Clupea harengus membras) and sprat (Sprattus sprattus).

The Ecopath with Ecosim (EwE)-approach has been employed in both, the food web description as well as the contaminant tracing. Ecotracer, the contaminant tracing extension of EwE, is further developed in collaboration with The Fisheries Centre of the University of British Columbia. Hence, the model will be able to evaluate the biomagnification of the toxin as a function of its solubility, organism specific storage and excretion, as well as the food web structure. The model is applied in a 2D model environment for scenario studies to estimate the risks related to the biomagnification of CW products within the food web and the geographic dispersal of potentially CWA containing organisms under different environmental scenarios. Currently, calculated estimates for environmental concentrations of CWAs are used. However, at the end of the project the best available information from WP3 and WP4 is applied in addition to the more theoretical approach. The model results will be validated with available observations of toxin content in different levels of the cascade.

Partner in charge

Finnish Institute of Marine Research (FIMR)

  • Tapani Stipa
  • Anu Hirvonen
  • Susa Niiranen

 

 
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In Bornholm over
35.000 tons were
dumped in water
depths ranging
between 70 and 120 m.