Table 2

Linear (β) and quadratic (γ) selection on all morphological traits measured in this study in a data set that included all individuals (Full, N = 172), as well as in a second dataset from which we excluded all individuals whose Gosner stage was > 39 at the time of release were excluded (Reduced, N = 151).

Directional selection

Quadratic selection


Data set

Trait

β ± SE

γ ± SE


Full

Head Length

0.08 ± 0.16

- 0.06 ± 0.16

Head Height

0.10 ± 0.12

0.14 ± 0.14

Tail Length

- 0.16 ± 0.13

0.004 ± 0.16

Tail muscle Height

- 0.14 ± 0.15

- 0.10 ± 0.14

Tail Fin Height

0.22 ± 0.09*

- 0.06 ± 0.11

Swimming speed

- 0.01 ± 0.07

- 0.06 ± 0.10

Reduced

Head Length

0.05 ± 0.19

- 0.10 ± 0.17

Head Height

0.09 ± 0.13

0.14 ± 0.15

Tail Length

- 0.17 ± 0.14

0.04 ± 0.19

Tail muscle Height

- 0.08 ± 0.16

- 0.03 ± 0.17

Tail Fin Height

0.21 ± 0.10*

- 0.05 ± 0.12

Swimming speed

- 0.05 ± 0.08

- 0.10 ± 0.11


Asterisks indicate significant (* P < 0.05) 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.

Calsbeek and Kuchta BMC Evolutionary Biology 2011 11:353   doi:10.1186/1471-2148-11-353

Open Data