|  | Directional selection | Quadratic selection |
---|
Data set | Trait | β ± SE | γ ± SE |
---|
Full | Head Length | 0.05 ± 0.09 | - 0.20 ± 0.07* |
 | Tail Length | - 0.17 ± 0.07* | - 0.16 ± 0.06* |
 | Tail Fin Height | 0.27 ± 0.05*** |  |
Reduced | Head Length | - 0.007 ± 0.10 | - 0.20 ± 0.08* |
 | Tail Length | - 0.11 ± 0.08 | - 0.10 ± 0.08 |
 | Tail Fin Height | 0.20 ± 0.07*** |  |
- Two identical analyses are presented: the first included all individuals (Full, N = 381), the second is from a censured dataset (Reduced, N = 325) from which all individuals whose Gosner stage was > 39 at the time of release were excluded. Asterisks indicate significant (* P < 0.05, ***P < 0.005) selection, as determined by a generalized linear model with a logit link function and survival (0 or 1) as the response variable. A term for Gosner stage was included in these models, but because development stage is not a "trait" on which one can measure selection, is not shown here. A factor for tank was also included. See text for details.