Table 1. Sample sizes and descriptive statistics of δ 15N (‰) and Hg concentrations (ng/g in dry weight) in feathers of European shag chicks sampled at three affected colonies from 2004 to 2009 and in feathers from juvenile carcasses collected during the Prestige accident representing pre-spill values from 2002.
| Hg(ng/g) | δ15N(‰) | |||||
|---|---|---|---|---|---|---|
| Colony | Year | N | mean±S.D | median | min-max | mean±S.D |
| Cíes | 2002 | 10 | 3893.6±2090.2 | 3742.3 | 899.0-7765.8 | 14.5±0.4 |
| 2004 | 20 | 543.0±193.6 | 505.2 | 293.9-1054.9 | 13.1±0.3 | |
| 2005 | 12 | 1103.9±578.5 | 1012.6 | 369.4-2307.7 | 13.4±0.2 | |
| 2006 | 14 | 1658.1±431.9 | 1603.0 | 922.2-2396.7 | 14.2±0.2 | |
| 2007 | 12 | 4368.1±1377.1 | 3952.1 | 2673.2-7267.8 | 14.4±0.4 | |
| 2008 | 11 | 3081.3±2059.4 | 2714.7 | 724.3-6458.5 | 14.4±0.2 | |
| 2009 | 10 | 3646.8±1395.5 | 3126.7 | 2162.8-6534.6 | 14.4±0.4 | |
| Ons | 2004 | 15 | 771.4±496.7 | 754.1 | 121.9-1740.7 | 13.4±0.3 |
| 2005 | 10 | 1785.3±818.2 | 1604.8 | 592.9-3804.7 | 13.5±0.3 | |
| 2006 | 12 | 1780.9±995.0 | 1846.7 | 268.1-3466.6 | 14.4±0.5 | |
| 2007 | 10 | 3402.1±1076.1 | 3059.3 | 2212.1-5353.4 | 14.6±0.5 | |
| Sagres | 2004 | 15 | 1412.9±826.6 | 1168.7 | 357.7-3341.3 | 13.6±0.2 |
| 2005 | 13 | 2355.5±925.6 | 2409.2 | 1268.1-4682.8 | 13.8±0.3 | |
| 2006 | 15 | 1797.6±464.5 | 1989.1 | 964.5-2520.1 | 14.4±0.3 | |
| 2007 | 10 | 4734.8±1036.5 | 5052.8 | 2524.7-6099.2 | 14.5±0.3 |