Table 1 Tests of the effects of soil collection latitude on plants grown in rhizosphere soil of A. philoxeroides or A. sessilis and beetles fed their leaves

Overall	Plant mass		# of seeds		Sqrt (# of knots)		Beetle mass
Factor	F _{1, 232}	P			F _{1, 232}	P	F _{1, 464}	P
Soil	0.01	0.9957			0.29	0.5939	0.34	0.5621
Species	1.79	0.1824			43.93	<0.0001	11.39	0.0008
Soil × species	0.50	0.4785			0.16	0.6907	0.02	0.8998
Latitude	16.57	<0.0001			116.37	<0.0001	9.93	0.0017
Soil × latitude	0.02	0.8939			0.54	0.4643	0.24	0.6220
Species × latitude	8.64	0.0036			31.46	<0.0001	8.99	0.0029
Soil × species × latitude	0.50	0.4781			0.25	0.6199	0.02	0.8768
A. philoxeroides plants
Factor	F _{1, 116}	P			F _{1, 116}	P	F _{1, 237}	P
Soil	0.22	0.6416			0.03	0.8557	0.10	0.7529
Latitude	0.55	0.4618			48.48	<0.0001	0.01	0.9147
Soil × latitude	0.30	0.5828			0.10	0.7511	0.06	0.8138
A. sessilis plants
Factor	F _{1, 116}	P	F _{1, 116}	P	F _{1, 116}	P	F _{1, 227}	P
Soil	0.30	0.5847	0.24	0.6252	0.25	0.6165	0.26	0.6112
Latitude	29.75	<0.0001	19.17	<0.0001	78	<0.0001	19.47	<0.0001
Soil × latitude	0.20	0.6542	0.19	0.6632	0.44	0.5091	0.22	0.6422

Overall models included species of plants, soil type (rhizosphere of A.sessilis vs. rhizosphere of A. philoxeroides), latitude, and their interactions. Response variables are: mass of invasive A. philoxeroides or native A. sessilis plants, the number of seeds of the native plant, the number of nematode root knots on the invasive or native plants, and the mass of A. hygrophila beetles fed leaves of the invasive or native plants. Significant results are shown in bold.

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