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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