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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.