Table 2.

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

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