Table 2.
Results of generalized linear model of host mortality after exposure to N.whitei using binomial error distribution. A)
| Factor | Df | Deviance | Resid. Df | Resid. Dev | P(> |Chi|) | |||
|---|---|---|---|---|---|---|---|---|
| Null deviance | 1125 | 1276.171 | ||||||
| Host line | 4 | 91.71 | 1121 | 1184.459 | < 0.001 | |||
| Parasite isolate | 4 | 45.98 | 1117 | 1138.484 | < 0.001 | |||
| Selection regime | 1 | 40.12 | 1116 | 1098.366 | < 0.001 | |||
| Line:Parasite | 16 | 8.25 | 1100 | 1090.116 | 0.941 | |||
| Line:Selection | 4 | 4.73 | 1096 | 1085.386 | 0.316 | |||
| Parasite:Selection | 4 | 15.41 | 1092 | 1069.976 | 0.004 | |||
| Line:Parasite:Selection | 16 | 27.58 | 1076 | 1042.396 | 0.035 | |||
| Results of post hoc contrast analysis of mortality | ||||||||
| 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 | -2.54 | 0.049 | -0.65 | 0.974 | -2.65 | 0.039 | 2.03 | 0.194 |
| 3 | 1.81 | 0.272 | -0.55 | 0.988 | 1.64 | 0.378 | -1.96 | 0.225 |
| 4 | 0.12 | 0.999 | 2.14 | 0.153 | 2.93 | 0.016 | 2.38 | 0.084 |
| 5 | 0.56 | 0.969 | 0.58 | 0.948 | -1.19 | 0.686 | -0.03 | 1.000 |
| 6 | 2.75 | 0.028 | -0.08 | 1.000 | -1.38 | 0.551 | -1.72 | 0.361 |
Levels of significance for the 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 local antagonists show higher mortality than foreign antagonists.