Table 2 Statistical results of the various mixed effect models performed

Infection rate

Variable

D.F.

F

P

Stickleback origin

3

20.290

<0.001

Parasite origin

1

5.570

0.018

Stickleback origin × Parasite origin

3

3.136

0.277

Relative S. solidus growth rate

Variable

D.F.

F

P

Stickleback origin

3

33.764

<0.001

Parasite origin

1

295.371

<0.001

Stickleback origin × Parasite origin

3

4.472

0.004

Fish standard length

Variable

D.F.

F

P

Stickleback origin

3

3.930

0.048

Stickleback origin × Parasite origin

8

2.118

0.032

Fish hepatosomatic index (HSI)

Variable

D.F.

F

P

Stickleback origin

3

2.158

0.170

Stickleback origin × Parasite origin

8

3.842

<0.001

Fish splenosomatic index (SSI)

Variable

D.F.

F

P

Stickleback origin

3

6.010

0.016

Stickleback origin × Parasite origin

8

5.799

<0.001