Table 1. ANCOVA for the specific growth rate of Lymnaea stagnalis snails during the experiment.

Source	df	MS	F	η2 (%)	p
Feeding treatment (F)	1	0.063	498.195	32.8	< 0.001
Infection status of focal individual (IF)	2	0.006	49.357	6.5	< 0.001
Infection status of competitor (IC)	2	0.001	5.210	0.7	0.006
Size	1	0.061	484.366	31.9	< 0.001
F×IF	2	0.000	1.985	0.3	0.139
F×IC	2	0.000	1.897	0.2	0.151
IF×IC	4	0.000	0.832	0.2	0.505
F×IF×IC	4	0.000	0.145	0.0	0.965
Error	415	0.000

Factors are feeding treatment [ad libitum food supply, reduced food supply (i.e. half of the average food consumption)], infection status of focal individual (unexposed, exposed but unparasitized, exposed and parasitized; parasite: Diplostomum pseudospathaceum) and infection status of competitor (unexposed, exposed but unparasitized, exposed and parasitized; parasite: D. pseudospathaceum). Snail size (ln of geometric mean of initial and final size) was used as a covariate. η² shows the proportion of total variance explained by each factor.