Table 2.

(a) Summary of the linear mixed-effect model conducted on the Shannon parasite index with individual average amino acid p-distance between alleles [corrected for the number of Major histocompatibility complex (MHC) alleles] and habitat of exposure as predictors. (b) Summary of the linear mixed-effect model conducted on the fish weight with Gyrodactylus load, MHC origin and habitat of exposure as predictors. Weight is expressed as residuals from a linear model with sex as predictor

	d.f.	F	P
(a) Shannon parasite index
Average p-distance	1,271	5.6130	0.0185
MHC origin	3,255	0.5166	0.6712
Habitat of exposure	1,25	40.4518	< 0.0001
Average p-distance × MHC origin	3,243	2.6102	0.0521
MHC origin × Habitat of exposure	3,269	1.3267	0.2660
(b) Fish weight
Gyrodactylus load	1,87	1.5610	0.2149
Habitat of exposure	1,8	17.2869	0.0030
MHC origin	1,140	0.2090	0.6482
Gyrodactylus × MHC origin	1,81	4.8635	0.0303

Mesocosm ID and family were set as random factors. Significant values (p < 0.05) are in bold.