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Table 2 Effects of ontogeny, treatments, their interactions, and body mass on bufadienolide synthesis of common toads

From: Age- and environment-dependent changes in chemical defences of larval and post-metamorphic toads

 

N

df

F

P

Number of bufadienolide compounds (NBC)

159

   

intercept

 

1, 80

860.495

<0.0001

 developmental stage

 

3, 80

2.222

0.092

 food level

 

1, 82

0.018

0.894

 predation treatment

 

1, 82

0.442

0.508

 developmental stage × food level

 

3, 76

1.882

0.140

 developmental stage × predation treatment

 

3, 76

0.249

0.862

 food level × predation treatment

 

1, 80

0.266

0.608

 developmental stage × food level × predation treatment

 

3, 68

0.368

0.777

Total bufadienolide quantity (TBQ, ng)

158

   

intercept

 

1, 78

3726.423

<0.0001

 body mass

 

1, 77

2.342

0.130

developmental stage

 

3, 78

18.313

<0.0001

food level

 

1, 78

9.646

0.003

 predation treatment

 

1, 77

0.495

0.484

 developmental stage × food level

 

3, 75

2.360

0.078

 developmental stage × predation treatment

 

3, 74

0.358

0.784

 food level × predation treatment

 

1, 76

0.493

0.485

 developmental stage × food level × predation treatment

 

3, 67

0.754

0.524

  1. Terms present in the final models are highlighted in bold. Statistics for non-significant terms that were dropped during model selection were calculated by re-entering the removed variables one by one into the final models