Table 1. Variance components of South Georgia shag dive depths of based on the trip nested within individual random effects model, calculated for each sex separately.
| Variance component | Male (n = 33) |
Female (n = 19) |
||||
|---|---|---|---|---|---|---|
| σ2 | σ | σ2 % | σ2 | σ | σ2 % | |
| Individual | 313.8 | 17.7 | 41.5 | 221.6 | 14.9 | 82.0 |
| Trip | 246.3 | 15.7 | 32.6 | 23.1 | 4.8 | 8.5 |
| Dive | 196.5 | 14.0 | 26.0 | 25.5 | 5.0 | 9.4 |
σ2 % represents the proportion of the total variance within each sex that is explained by the given variance component: the value for the individual level gives an estimate of individual repeatability or specialisation.