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Sources of variability in the concentrations of elements [log(x + 1)-transformed] (average percentage dissimilarity) in the eggshells of black-headed gulls from the studied colonies according to a SIMPER analysis
| Element | Average dissimilarity | Contribution (%) |
|---|---|---|
| Al | 0.942 | 16.68 |
| Fe | 0.858 | 15.19 |
| Zn | 0.805 | 14.25 |
| Cr | 0.602 | 10.66 |
| Cu | 0.562 | 9.96 |
| Mn | 0.528 | 9.35 |
| Sr | 0.333 | 5.90 |
Only elements with a contribution of >5% are presented
