Table 2.
Results of the generalized linear model analysis for the sperm competition assay. There was strong second-male precedence overall, as well as superiority of non-inbred males in both first- and second-male sperm competition treatments. The male type × mating order interaction was also highly significant, as the difference between inbred and non-inbred males was greater in the second-male (P2) treatment. Statistically significant factors (p < 0.05) are marked in italic. See also figure 1 for the illustration of the experimental design and figure 3 for means and standard errors.
| source | d.f. | G2 | F | p |
|---|---|---|---|---|
| male (inbred/non-inbred) | 1 | 721.7 | 25.5 | <0.001 |
| mating order (first/second) | 1 | 8656.2 | 306.6 | <0.001 |
| male × mating order | 1 | 204.2 | 7.6 | 0.006 |