Table 2.
Analysis of genetic variation in disease tolerance using parasite spore load as measure of infection intensity. The two-way interactions between monarch family and parasite spore load were not statistically significant, indicating no genetic variation in tolerance. Other non-significant two-way interactions are not represented. Significance (p < 0.05) is indicated by asterisks.
| χ2 | d.f. | p | |
|---|---|---|---|
| adult lifespan | |||
| spore load | χ2 = 81.52 | d.f. = 1 | p < 0.001* |
| (spore load)2 | χ2 = 155 | d.f. = 1 | p < 0.001* |
| monarch family | χ2 = 29.2 | d.f. = 18 | p = 0.039* |
| monarch sex | χ2 = 0.09 | d.f. = 1 | p = 0.77 |
| monarch family × spore load | χ2 = 27.9 | d.f. = 18 | p = 0.064 |
| monarch family × (spore load)2 | χ2 = 28.1 | d.f. = 18 | p = 0.056 |
| adult mass | |||
| spore load | χ2 = 3.37 | d.f. = 1 | p = 0.066 |
| (spore load)2 | χ2 = 1.7 | d.f. = 1 | p = 0.2 |
| monarch family | χ2 = 30 | d.f. = 18 | p = 0.04* |
| monarch sex | χ2 = 6.14 | d.f. = 1 | p = 0.01* |
| monarch family × spore load | χ2 = 26.6 | d.f. = 18 | p = 0.11 |
| monarch family × (spore load)2 | χ2 = 29 | d.f. = 18 | p = 0.059 |