Table 1 Results of Cox proportional hazard model for survival, and the linear models for maturity and reproduction of generation G3 respectively.

From: Variable stressor exposure shapes fitness within and across generations

Generation

Dependent variable

Explanatory variable

χ2

d.f

p value

G3

Survival

Genotype

0.77

1

0.38

Treatment

13.82

2

0.001

Treatment × Genotype

8.16

2

0.017

Reproduction

Genotype

6.51*

2

0.006

Treatment

0.17*

1

0.69

Treatment × Genotype

4.15*

2

0.028

Maturity

Genotype

18.98*

2

 < 0.001

Treatment

6.71*

1

0.016

Treatment × Genotype

2.07*

2

0.15

G4

Survival†

Treatment

7.64

1

0.006

Ancestry

4.83

1

0.028

Treatment × Ancestry

0.23

1

0.63

Mother ID

Variance = 0.087; standard deviation = 0.295

Reproduction

Treatment

43.37

1

 < 0.001

Ancestry

8.58

1

0.003

Treatment × Ancestry

0.96

1

0.33

Mother ID

Variance = 0.018; standard deviation = 0.136

Maturity

Treatment

6.34

1

0.012

Ancestry

0.01

1

0.91

Treatment × Ancestry

0.17

1

0.67

Mother ID

Variance = 0.47; standard deviation = 0.68

  1. Mixed effects versions of the same models were employed to analyse the G4 generation with the Mother ID serving as the random effect. Significant explanatory variables (α < 0.05) are emboldened
  2. *Values shown here relate to the F statistic and not to χ2
  3. †This analysis involves only genotype ‘D’
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