highly significantp < 0.0001
Nematode feeding groups When all samples were assigned into four groups by feeding type ( Table 1 ), analysis of variance showed highly significant differences in δ 15 N ( p < 0.0001) between the plant feeder and other feeders and in δ 13 C (F 3;33 = 24.18 p < 0.0001) between all groups.