Modeling metal bioaccumulation in the invasive mussels Dreissena polymorpha and Dreissena rostriformis bugensis in the rivers Rhine and Meuse.
The metal-specific covalent index and the species-specific size-based filtration rate were integrated into a biokinetic model estimating metal bioaccumulation in mussels from the dissolved phase and phytoplankton. The model was validated for zebra (Dreissena polymorpha) and quagga (Dreissena rostriformis bugensis) mussels in the rivers Rhine and Meuse, the Netherlands. The model performed well in predicting tissue concentrations in different-sized zebra mussels from various sampling sites for 55Mn, 56Fe, 59Co, 60Ni, 82Se, 111Cd, 118Sn, and 208Pb (r2=0.71-0.99). Performance for 52Cr, 63Cu, 66Zn, 68Zn, and 112Cd was moderate (r2<0.20). In quagga mussels, approximately 73 to 94% of the variability in concentrations of 82Se, 111Cd, 112Cd, and 208Pb was explained by the model (r2=0.73-0.94), followed by 52Cr, 55Mn, 56Fe, 60Ni, and 63Cu (r2=0.48-0.61). Additionally, in both zebra and quagga mussels, average modeled concentrations were within approximately one order of magnitude of the measured values. In particular, in zebra mussels, estimations of 60Ni and 82Se concentrations were equal to 51 and 76% of the measurements, respectively. Higher deviations were observed for 52Cr, 59Co, 55Mn, 56Fe, 111Cd, 63Cu, and 112Cd (underestimation), and 66Zn, 68Zn, 208Pb, and 118Sn (overestimation). For quagga mussels, modeled concentrations of 66Zn and 68Zn differed approximately 14% from the measured levels. Differences between predictions and measurements were higher for other metals.