Table 3

Linear (β) and quadratic (γ) selection on all morphological traits except burst swimming speed.

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.

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

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