Table 3 Comparison of linear models to test whether demography (in the form of intrinsic growth rate µ, carrying capacity K and interaction coefficient α) can be explained by the response in mean or variance of the strategy index (Δmean and Δvariance, respectively) and if this effect differs among and/or interacts with strains. StrainT indicates only strains of T. thermophila were allowed to have different intercepts while all Colpidium strains were set to have the same intercept and vice versa for StrainC. The best models are in bold

Null

 ~ 1

155.44

-

146.94

-

155.44

-

Mean 1

 ~ Δmean

154.53

0.04

146.89

0.02

153.72

0.05

Mean 2

 ~ Δmean + strain

146.01

0.28

148.45

0.13

131.74

0.45

Mean 3

 ~ Δmean + strainC

159.77

0.02

152.46

0.00

149.15

0.19

Mean 4

 ~ Δmean + strainT

143.57

0.27

145.66

0.12

143.94

0.27

Mean 5

 ~ Δmean * strain

156.81

0.27

161.60

0.08

139.64

0.47

Mean 6

 ~ Δmean * strainC

165.49

0.00

159.95

-0.05

153.61

0.20

Mean 7

 ~ Δmean * strainT

149.56

0.26

151.45

0.11

150.23

0.25

Variance 1

 ~ Δvariance

157.05

-0.01

145.65

0.05

155.23

0.03

Variance 2

 ~ Δvariance + strain

149.12

0.24

151.94

0.07

139.31

0.37

Variance 3

 ~ Δvariance + strainC

163.26

-0.05

151.72

0.01

155.53

0.09

Variance 4

 ~ Δvariance + strainT

145.68

0.24

147.81

0.09

145.80

0.24

Variance 5

 ~ Δvariance * strain

161.06

0.21

160.83

0.09

149.54

0.36

Variance 6

 ~ Δvariance * strainC

167.91

-0.04

154.12

0.06

157.69

0.14

Variance 7

 ~ Δvariance * strainT

151.34

0.23

150.73

0.12

153.61

0.20