Table 2. Summary of ANOVAs for the effects of Hydrocotyle vulgaris invasion and nutrient level on biomass and evenness of the native communities (A) and biomass of each native species (B).

Traits	Invasion (I)		Nutrient (N)		I × N
	F1,20	P	F1,20	P	F1,20	P
(A) Native plant communities
Total massb	0.06	0.808	17.84	0.001	3.05	0.100
Aboveground massb	0.01	0.942	20.41	<0.001	3.17	0.094
Underground mass	0.55	0.467	7.35	0.015	2.58	0.128
Evenness of mass	1.49	0.240	9.39	0.007	1.53	0.233
(B) Native species
Setaria viridis	0.05	0.819	19.21	<0.001	2.25	0.152
Festuca arundinacea	0.01	0.930	0.48	0.495	0.76	0.397
Poa pratensis	0.03	0.859	2.46	0.136	0.75	0.398
Bromus inermis	0.31	0.588	0.25	0.623	1.60	0.224
Trifolium repens	1.17	0.293	0.02	0.889	0.36	0.556
Astragalus sinicus	4.78	0.049	0.10	0.756	0.20	0.661
Plantago asiatica	1.89	0.188	0.84	0.374	0.14	0.711
Oxalis corniculata	1.12	0.305	0.93	0.350	0.00	0.986

Values are in bold if P < 0.01 and in italics if P < 0.05. See Figs 2 and 5 for data.

^bIndicates square root-transformed data.