Table 2.
Results from (a) MANCOVA and (b) ANCOVA models analysing attributes of dyadic male aggressive interactions in Experiment 2 (lab-reared males). F-ratios were approximated using Wilk's λ. Partial variance was estimated using Wilk's partial η 2. Significant effects are in bold typeface.
| df | F | P | Partial variance explained [%] | |
|---|---|---|---|---|
| (a) MANCOVA (number of aggressive behaviours) | ||||
| Light (absent/present) | 3,62 | 8.97 | <0.001 | 0.30 |
| Sulphide (absent/present) | 3,62 | 2.45 | 0.072 | 0.10 |
| Light × sulphide | 3,62 | 3.77 | 0.015 | 0.15 |
| Male body size difference | 3,62 | 3.35 | 0.025 | 0.14 |
| Mean pair body size | 3,62 | 2.81 | 0.044 | 0.12 |
|
| ||||
| (b) ANCOVA (fight duration) | ||||
| Light (absent/present) | 1 | 8.44 | 0.005 | 0.12 |
| Sulphide (absent/present) | 1 | 7.07 | 0.010 | 0.10 |
| Light × sulphide | 1 | 2.48 | 0.120 | 0.04 |
| Male body size difference | 1 | 0.25 | 0.622 | <0.01 |
| Mean pair body size | 1 | 0.71 | 0.403 | 0.01 |
| Error | 64 | |||