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Table 2 Comparison of seasonal and long-term variations in metal burdens (given as ng g−1 wet weight and dry weight) of blue mussels (Mytilus edulis) from the North Sea sampling site Koenigshafen

From: Seasonal variability in metal and metalloid burdens of mussels: using data from the German Environmental Specimen Bank to evaluate implications for long-term mussel monitoring programs

KoenigshafenMonths of annual minimum conc.Months of annual maximum conc.Annual range (ng g−1) ww/dwRange over 17 years (ng g−1) ww/dw
CobaltDec.–Feb.Apr.–Aug.57.9/79827.8/478
CopperOct.–Feb. (except 2013)April261/1953296/1984
CadmiumNo clear seasonality, n.c.26.5/61128.3/723
NickelAug.–Oct.June133/187286.2/1469
LeadOct.April50.4/99688.7/1487
MercuryAug.–Oct.Dec.–April10.6/1278.73/132
MethylmercuryJune–Aug.Oct.–April5.41/46.74.99/33.2
ArsenicJune–Oct.Dec.–April975/95381062/9830
SeleniumAug.–Oct.Dec.–April276/2003194/1095
TributyltinAug.–Dec.April1.81/20.61.04/16.6