Table 3.
Reproductive variance and opportunity for selection in a cohort of same-aged males followed for six years of adulthood. (Detailed histories of these 21 individuals are presented in figure 3.)
| all males in same-aged cohort identified in 2000 | cohort males surviving until 2006 | |
|---|---|---|
| number of males | 21 | 9 |
| proportion ever alpha | 0.24 | 0.56 |
| total chicks sired | 15 | 15 |
| average number of chicks per male | 0.71 | 1.67 |
| average chicks per alpha | 3 | 3 |
| average chicks per non-alpha | 0 | 0 |
| Vtotal | 2.82 | 5.00 |
| Vwithin-status | 1.19 | 2.78 |
| Vbetween-status | 1.63 | 2.22 |
| Itotal | 5.53 | 1.80 |
| Ibetween-status | 3.20 | 0.80 |
| Iwithin-status | 2.33 | 1.00 |
| Ibetween-status/Iwithin-status | 0.58 | 0.44 |