Table 2. Results of general linear mixed models for seven species showing the influence of ice cover, maximum ice extent (km²) in the Baltic Sea (max ice) and season on the percentage of occurrence of bottom-feeders (denoted by B, Scaup, Tufted Duck, Pochard, Goldeneye, Coot) and piscivores (denoted by P, Smew, Goosander) in the Odra River Estuary.

Species, method and month were treated as random effects.

Model Term	Coefficient	Std. Error	t	P
Intercept	26.553	11.619
Ice cover	0.014	0.006	2.375	0.018
Season	−0.013	0.006	−2.204	0.028
Max ice	−0.114	0.040	−2.824	0.005
Feed[B]	−38.751	11.959	−3.240	0.001
Season*Feed[B]	0.019	0.006	3.212	0.001
Ice cover*Feed[B]	−0.044	0.007	−6.623	<0.001
Max ice*Feed[B]	0.094	0.046	2.071	0.039
Species (r)	0.074	0.048
Method (r)	0.015	0.020
Month (r)	0.001	0.002