Table 1 Model selection summary of six candidate regression models.

From: Extrinsic factors, endocrine mechanisms, and behavioral indicators of migratory restlessness in wintering whooper swans (Cygnus cygnus)

Model

k

logLik

AICc

∆AICc

wi

R2

FGM ~ temperature2

3

− 47.61

103.4

0.00

0.85

0.88

FGM ~ temperature + temperature2

4

− 47.48

107.0

3.57

0.14

0.88

FGM ~ daylength + daylength2

4

− 51.29

114.6

11.18

0.00

0.81

FGM ~ temperature

3

− 54.10

116.4

12.98

0.00

0.72

FGM ~ daylength2

3

− 56.12

120.4

17.02

0.00

0.63

FGM ~ daylength

3

− 56.62

121.4

18.02

0.00

0.61

Null

2

− 63.60

132.2

28.79

0.00

–

  1. The fecal glucocorticoid metabolite (FGM) concentration of wintering whooper swans was used as the dependent variable, while day length, mean air temperature as well as their quadratic terms were used as independent variables. Models were ranked by Akaike Information Criterion values corrected for small sample size (AICc) and weights (wi), whereby higher weighted models received more support. K number of parameters included in the model, R2 regression coefficient.
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