Table 1.

F values and levels of significance from linear mixed-effects models relating food web metrics (linkage density, interaction diversity, interaction evenness, vulnerability and generality), (hyper)parasitism rates and aphid density for aphid–primary parasitoid webs and primary–hyperparasitoid webs to two predictive factors: (1) agricultural intensification and (2) sampling week (including polynomial terms for “Week”)

	AI	Week	Week2	Week3	AI:Week	AI: WeekP
Aphid–primary parasitoid
Linkage density	NS	23.42***	14.20**	NS	6.52*	NS
Interaction diversity	10.38*	32.05***	18.19**	NS	7.52*	NS
Interaction evenness	NS	4.35*	NS	NS	NS	NS
Vulnerability	NS	NS	8.88***	6.48*	7.86**	NS
Generality	NS	4.49*	NS	NS	NS	5.31*
Primary parasitism rate	NS	9.82**	NS	NS	5.88*	NS
Primary–hyperparasitoid
Linkage density	NS	NS	NS	NS	NS	NS
Interaction diversity	NS	7.17*	NS	NS	NS	NS
Interaction evenness	NS	45.76***	NS	NS	NS	NS
Vulnerability	NS	NS	NS	NS	NS	NS
Generality	NS	8.69**	NS	NS	NS	13.63**
Hyperparasitism rate	NS	53.82***	NS	NS	4.60*	NS
Aphid density	NS	NS	NS	5.41*	5.67*	NS

A strict interpretation (corrected for multiple testing) would render only P values <0.003 significant (but see “Materials and methods” section for arguments against correcting for multiple testing)

* p < 0.05; ** p < 0.01; *** p < 0.001; NS p > 0.05

^PPolynomial, i.e. 2 or 3