Table 2.
Linear mixed effects model results for male and female fitness and egg-to-adult viability. For the cross fixed effect (within- versus between-strain cross), estimated marginal means (emm) are shown with their standard errors (se). All measures of fitness and viability were log ratios. For fitness [egg-to-adult viability], values ~0 imply comparable numbers of brown-eye [dead] and wild-type [alive] offspring; values > 0 imply more wild-type [alive] offspring (higher fitness [viability] of experimental flies); values < 0 imply more brown-eyed [dead] offspring (lower fitness [viability] of experimental flies).
| Trait | Effect | Cross level | emm (se) | Variance (x100) | d.f. | χ2 | P |
|---|---|---|---|---|---|---|---|
| Male fitness | Block (fixed, categorical) | 4 | 154.42 | <0.00001 | |||
| Cross (fixed, categorical) | Within | 0.10 (0.16) | 1 | 12.15 | 0.0005 | ||
| Between | 0.74 (0.10) | ||||||
| Fstrain (random) | 0.22 | 1 | 0.00 | 1 | |||
| Mstrain (random) | 0.00 | 1 | 0.00 | 1 | |||
| Mstrain:Fstrain (random) | 22.12 | 1 | 7.76 | 0.0053 | |||
| Residual | 273.42 | ||||||
| Female fitness | Block (fixed, categorical) | 4 | 799.11 | <0.00001 | |||
| Cross (fixed, categorical) | Within | 0.52 (0.09) | 1 | 2.10 | 0.1472 | ||
| Between | 0.67 (0.05) | ||||||
| Fstrain (random) | 0.00 | 1 | 0.00 | 1 | |||
| Mstrain (random) | 0.00 | 1 | 0.00 | 1 | |||
| Mstrain:Fstrain (random) | 5.25 | 1 | 6.23 | 0.0125 | |||
| Residual | 84.89 | ||||||
| Egg-to-adult viability | Block (fixed, categorical) | 4 | 3.38 | 0.4967 | |||
| Cross (fixed, categorical) | Within | 0.78 (0.16) | 1 | 44.80 | <0.00001 | ||
| Between | 1.65 (0.14) | ||||||
| Fstrain (random) | 22.10 | 1 | 10.57 | 0.0011 | |||
| Mstrain (random) | 3.87 | 1 | 0.52 | 0.4707 | |||
| Mstrain:Fstrain (random) | 4.97 | 1 | 0.78 | 0.3758 | |||
| Residual | 136.20 |