|  | Directional selection | Quadratic selection |
---|
Data set | Trait | β ± SE | γ ± SE |
---|
Full | Head Length | - 0.01 ± 0.11 | - 0.18 ± 0.10 |
 | Head Height | 0.10 ± 0.09 | 0.04 ± 0.09 |
 | Tail Length | - 0.19 ± 0.07* | - 0.16 ± 0.06* |
 | Tail muscle Height | 0.02 ± 0.09 | - 0.03 ± 0.09 |
 | Tail Fin Height | 0.24 ± 0.06*** | - 0.07 ± 0.06 |
Reduced | Head Length | - 0.08 ± 0.12 | - 0.24 ± 0.11* |
 | Head Height | 0.07 ± 0.10 | 0.07 ± 0.10 |
 | Tail Length | - 0.14 ± 0.08 | - 0.11 ± 0.08 |
 | Tail muscle Height | 0.07 ± 0.10 | -0.03 ± 0.10 |
 | Tail Fin Height | 0.16 ± 0.07* | -0.08 ± 0.08 |
- The results of two analyses are presented: a Full dataset that included all individuals (N = 381), as well as in a second dataset in data set (Reduced, N = 324), from which we excluded all individuals whose Gosner stage was > 39 at the time of release. 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.