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Table 4 Linear (β) and quadratic (γ) selection on morphological traits used in a model chosen based on AIC scores.

From: Predator mediated selection and the impact of developmental stage on viability in wood frog tadpoles (Rana sylvatica)

  

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***

 
  1. 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.
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