The influence of feeding ecology and location on total mercury concentrations in Eurasian perch (Perca fluviatilis)

Environmental Sciences Europe

Table 1 Difference in the trophic magnification curves between the perch groups, compared by means of the variation analysis ANCOVA

Compared groups	M1: without interaction¹		M2: with interaction²		ANOVA: M1 vs M2³
Compared groups	F value	p-value	F value	p-value	F value	p-value
1. vs 2	0.009	0.926	0.187	0.669	0.187	0.669
1. vs 3	8.569	0.005	0.011	0.916	0.011	0.916
1. vs 4	0.000	0.990	13.480	< 0.001	13.484	< 0.001
2. vs 3	9.943	0.002	0.771	0.383	0.771	0.382
2. vs 4	0.785	0.381	10.410	0.003	10.414	0.003
3. vs 4	6.859	0.011	15.110	< 0.001	15.110	< 0.001

Bold text indicates significant differences between the curves
¹The regression model M1 includes independent variable δ¹⁵N, independent factor “Group” and dependent variable LOG THg concentrations
²The regression model M2 includes interaction between independent variable δ¹⁵N and independent factor “Group” and dependent variable LOG THg concentrations
³One-way analysis of variance of the regression models M1 and M2