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Table 1 Models describing the distributions of clonal susceptibility for the pre-epidemic, post-epidemic and post-sex clones.

From: Parasite-mediated disruptive selection in a natural Daphnia population

Type of selection

Model

Pre-epidemic

Post-epidemic

Post-sex

n

AIC

evidence ratio

No selection

1) unimodal: null

μ A

σ A

μ A

σ A

μ A

σ A

2

-45.29

2145

 

2) bimodal: null

μ 1A

σ A

μ 2A

σ A

μ 1A

σ A

μ 2A

σ A

μ 1A

σ A

μ 2A

σ A

3

-51.61

90.8

Directional selection

3*) unimodal: mean, var differ

μ A

σ A

μ B

σ B

μ C

σ C

6

-44.74

2817

 

4) unimodal: pre-epidemic differs

μ A

σ A

μ B

σ B

μ B

σ B

4

-47.99

557

 

5*) bimodal: all modes differ

μ 1A

σ A

μ 2A

σ A

μ 1B

σ A

μ 2B

σ A

μ 1C

σ A

μ 2C

σ A

7

-56.96

6.27

 

6) bimodal: pre-epidemic differs

μ 1A

σ A

μ 2A

σ A

μ 1B

σ A

μ 2B

σ A

μ 1B

σ A

μ 2B

σ A

5

-60.55

1.04

Disruptive selection

7) mixed: uni-bi.-bi., same modes

μ A

σ A

μ 1B

σ A

μ 2B

σ A

μ 1B

σ A

μ 2B

σ A

4

-60.63

1

 

8*) mixed: uni.-bi.-bi., modes differ

μ A

σ A

μ 1B

σ A

μ 2B

σ A

μ 1C

σ A

μ 2C

σ A

6

-56.86

6.58

 

9*) mixed: uni.-bi.-uni.

μ A

σ A

μ 1B

σ B

μ 2B

σ B

μ C

σ C

7

-52.02

74

  1. The mean/mode parameter of the unimodal normal distribution is μ and the standard deviation is σ. The central tendency parameters for the modes in the bimodal normal distributions are μ1 and μ2 and the standard deviation for each mode is σ i . Within each model, parameters with the same subscript are constrained to be equal. Parameters for the best fit model (model 7, highlighted in bold) with 95% confidence intervals based on likelihood profile [51] in parentheses are μA = 0.28 (0.24–0.32), μ1B = 0.42 (0.38–0.46), μ2B = 0.10 (0.06–0.15), σA = 0.08 (0.07–0.11). Parameters for model 6 are μ1A = 0.21 (0.11–0.40), μ2A = 0.34 (0.11–0.40), μ1B = 0.42 (0.38–0.45), μ2B = 0.10 (0.06–0.14), σA = 0.07 (0.06–0.10). Model selection is based on Akaike's Information Criteria (AIC) which incorporates the number of estimated parameters (n). "Uni" = unimodal; "bi" = bimodal. The evidence ratio is the odds ratio of support for the best fit model over the listed model [50]; models with evidence ratios close to 1 are well-supported. Models that allow for a change in the distribution after sexual reproduction have an asterisk (*) after the model number.