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Table 2 Results of the analyses describing the effects of host genotype, and density manipulation on the disease characteristics of infected animals

From: The trans-generational impact of population density signals on host-parasite interactions

 

Direct effect (F0)

Maternal effect (F1)

Infection rate

χ 2 1

Partial-η2

χ 2 1

Partial-η2

 Pathogen clone (GP)

–

–

2.08

0.013

 Host clone (GH)

–

–

7.25**

0.042

 Density effect (E)

–

–

8.22**

0.048

 GP x GH

–

–

0.40

0.002

 GP x E

–

–

2.40

0.015

 GH x E

–

–

0.27

0.002

 GP x GH x E

–

–

0.31

0.002

Pathogen spore loads

F 1, 220

Partial-η2

F 1, 224

Partial-η2

 Pathogen clone (GP)

42.28***

0.161

3.77#

0.017

 Host clone (GH)

8.75**

0.038

4.89*

0.021

 Density effect (E)

0.53

0.002

4.15*

0.018

 GP x GH

0.05

<0.001

6.16*

0.027

 GP x E

0.08

<0.001

0.01

<0.001

 GH x E

23.41***

0.096

0.12

0.001

 GP x GH x E

0.73

0.003

3.19#

0.014

Host body size

F 1, 241

Partial-η2

F 1, 229

Partial-η2

 Pathogen clone (GP)

6.36*

0.026

7.52**

0.032

 Host clone (GH)

45.45***

0.159

1.25

0.005

 Density effect (E)

0.17

0.001

25.78***

0.101

 GP x GH

0.11

<0.001

4.53*

0.019

 GP x E

0.57

0.002

2.60

0.011

 GH x E

103.02***

0.299

22.84***

0.091

 GP x GH x E

0.76

0.003

0.60

0.003

Overall host fecundity

F 1, 241

Partial-η2

F 1, 230

Partial-η2

 Pathogen clone (GP)

89.26***

0.270

14.84***

0.061

 Host clone (GH)

200.18***

0.454

35.82***

0.135

 Density effect (E)

2.47

0.010

17.00***

0.069

 GP x GH

1.05

0.004

0.73

0.003

 GP x E

6.18*

0.025

3.08

0.013

 GH x E

0.13

0.001

0.34

0.001

 GP x GH x E

1.41

0.006

2.02

0.009

  1. Direct effect refers to the treatment where animals were raised directly in conditioned water, whereas the maternal effect refers to the offspring of these manipulated mothers. Traits measured include the proportion of animals infected overall, plus the pathogen spore loads, body size, and lifetime fecundity of animals that survived until the end of the experimental period. Presented are the appropriate test statistics (# p < 0.1, *p < 0.05, **p < 0.01, ***P < 0.001), and relative effect sizes (partial-η2) that estimate the proportion of variability associated with a particular effect