Table 1 Effects of phenotypic traits and genetic structure on the fitness of the defector.

From: Evolutionary history predicts the stability of cooperation in microbial communities

 

df

F

P-value

Phenotypic traits

 Initial defector frequency (IF)

Linear term

1

0.36

n.s.

Quadratic term

1

15.73

<0.001

 Public good production (PG)

Linear term

1

3.10

0.080

Quadratic term

1

0.05927

n.s.

 Defector inhibition (DI)

Linear term

1

3.91

0.049

Quadratic term

1

0.085

n.s.

 IF (linear) × DI

1

17.94

<0.001

 IF (linear) × PG

1

3.40

0.067

Genetic structure

 Genotypic richness

3

0.36

0.553

 Initial defector frequency (IF)

Linear term

1

4.20

0.043

Quadratic term

1

23.41

<0.001

 Genetic distance to defector (GD)

Linear term

1

33.02

<0.001

 IF (linear) × GD

1

66.90

<0.001

 IF (quadratic) × GD

 

28.52

<0.001

 Bacterial composition

33

1.36

0.112

  1. Effect of phenotypic traits (protease activity and defector inhibition) and genetic structure (genotypic richness and mean genetic distance between defector and the cooperators) of cooperating Pseudomonas fluorescens communities on the relative fitness of the defector strain P. fluorescens CHA0ΔgacS (generalized linear model, the two analyses were carried out independently). Initial defector frequency was fitted as linear and quadratic terms to account for hump-shaped frequency-dependent fitness. Effects of genotypic richness and genetic distance of the defector to the community of cooperators were tested against bacterial composition. Significant effects are given in bold.
  2. n.s.=not significant, P>0.05.
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