Table 5.

Inter-colony dissimilarity (in percent) (SIMPER analyses; dissimilarity measure: Bray-Curtis, above the diagonal) and differences (Bonferroni-corrected P values, ANOSIM analysis; dissimilarity measure: Bray-Curtis, below the diagonal) in the concentrations of elements found in the eggshells of black-headed gulls in four breeding colonies in northern Poland

	Skoki Duże	Koronowo	Bydgoszcz	Pakość	Kusowo
Skoki Duże	–	5.23	5.48	4.48	6.99
Koronowo	0.03	–	5.02	5.03	6.07
Bydgoszcz	0.001	0.002	–	4.54	6.59
Pakość	0.002	0.01	0.002	–	6.97
Kusowo	0.001	0.001	0.001	0.001	–