Plant Fitness Assessment for Wild Relatives of Insect Resistant Bt-Crops

Table 1

Mean number of radish or mustard plants surviving to reproduce when the approximate half the mean seed output advantage per plant due to herbivore protection was added to microcosms (𝑛=10 per habitat type) and field plots (𝑛=5 per habitat per field site) compared to microcosms and field plots to which no seeds were added (control). Note that some seeds (whether added or present in the seed bank) exhibit dormancy.

	Disked soil habitat		Grassland habitat
Experiment	Seeds added	Control	Seeds added	Control
Radish microcosms^1	7.4+0.1	0.3+0.2	7.9+2.6	3.9+1.1
Mustard microcosms^2	3.2+0.7	0.0+0.0	0.7+0.3	0.0+0.0
Radish field plots^3	2.0+0.8	0.1+0.07	4.7+1.95	3.6+1.03
Mustard field plots^4	7.0+1.96	1.1+0.68	0.0+0.0	0.0+0.0

¹ANOVA on rank number of flowering radish plants per microcosm, with 𝐹=30.5, 𝑃=0.0001 for seed addition effects, 𝐹=1.4, 𝑃=0.2452 for disked versus natural soil microcosms, and 𝐹=6.7, 𝑃=0.0136 for seed addition by habitat interaction.
²ANOVA on rank number of flowering wild mustard plants per microcosm, with 𝐹=26.6, 𝑃<0.0001 for seed addition effects, 𝐹=7.4, 𝑃=0.0101 for disked versus natural soil, and 𝐹=4.2, 𝑃=0.0485 for seed addition by community interaction.
³Nested ANOVA on ranks for the number of wild radish plants after six months, seed addition treatment (site),𝐹_2,56=4.72, 𝑃=0.0165; habitat (site) 𝐹_2,56=23.13, 𝑃≤0.0001; treatment* habitat (site) 𝐹_2,56=1.63, 𝑃=0.2125.
⁴Nested ANOVA on ranks for the number of wild mustard plants after six months, seed addition treatment (site), 𝐹_2,56=8.0, 𝑃=0.0123; habitat (site) 𝐹_2,56=8.24, 𝑃=0.0114; treatment* habitat (site) 𝐹_2,56=8.0, 𝑃=0.0123.