Table 1 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 Eckwarderhoerne
Eckwarderhoerne | Months of annual minimum conc. | Months of annual maximum conc. | Annual range (ng g−1) ww/dw | Range over 17 years (ng g−1) ww/dw |
|---|---|---|---|---|
Cobalt | Oct.–Feb. | June | 102/1174 | 54.2/852 |
Copper | Oct.–April | Aug. | 451/3314 | 383/2850 |
Cadmium | No clear seasonal variability | 31.2/833 | 62.5/1125 | |
Nickel | Aug.–Dec. | June | 167/2216 | 111/1580 |
Lead | June–Oct. (2013 Dec.) | April | 105/2301 | 196/1871 |
Mercury | No clear seasonal variability | 8.42/176 | 10.5/137 | |
Methylmercury | No clear seasonal variability | 2.52/43.9 | 2.39/34.1 | |
Arsenic | No clear seasonal variability | 644/8493 | 585/7697 | |
Selenium | Aug.–Oct. | April–June | 166/2966 | 215/3053 |
Tributyltin | Aug.–Oct. | April | 1.29/17.5 | 5.15/58.0 |