Table 3

Results of a generalized linear model of spore load in a randomly collected subsample of eight beetles per experimental block.

Factor

Df

Deviance

Resid. Df

Resid. Dev

P(> |Chi|)


Null deviance

379

10657902

Individual mortality (Dead/Alive)

1

8698191

378

1959711

< 0.001

factor(Line)

4

113410.1

374

1846301

< 0.001

Parasite

4

199320.9

370

1646980

< 0.001

Selection

1

77375.2

369

1569605

< 0.001

Line:Parasite

16

191614.9

353

1377990

< 0.001

Line:Selection

4

22822.19

349

1355168

0.303

Parasite:Selection

4

139426.9

345

1215741

< 0.001

Line:Parasite:Selection

16

146398.9

329

1069342

0.013

Results of post hoc contrast analysis of spore load

Within host (coevolved lines)

Within parasite (coevolved lines)

Within host (control lines)

Within parasite (control lines)

Line/Isolate

Z value

P

Z value

P

Z value

P

Z value

P

1

-0.29

0.939

-0.07

1.000

0.48

0.983

0.60

0.982

3

0.47

0.822

0.38

0.998

-0.55

0.973

2.09

0.169

4

0.11

0.998

0.52

0.990

3.02

0.012

-1.21

0.726

5

0.03

1.000

0.04

1.000

1.28

0.618

-0.29

0.999

6

0.56

0.753

0.52

0.990

-0.61

0.961

0.06

1.000


Levels of significance of GLM model fits were tested using analysis of deviance with chi-square distribution. Post hoc test results for contrasts between sympatric and allopatric combinations are shown below. Positive Z values indicate combinations where were local antagonists show higher spore load than foreign antagonists.

Bérénos et al. BMC Evolutionary Biology 2012 12:11   doi:10.1186/1471-2148-12-11

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