Table 3. Summary of ANOVAs for the effects of Hydrocotyle vulgaris invasion and nutrient level on biomass of each functional group.

Traits	Invasion (I)		Nutrient (N)		I × N
	F1,20	P	F1,20	P	F1,20	P
(A) Grasses
Total mass	0.54	0.470	22.82	<0.001	3.01	0.100
Aboveground mass	0.40	0.533	25.61	<0.001	2.69	0.117
Underground mass	1.10	0.307	9.63	0.006	3.51	0.077
(B) Legumes
Total mass	1.13	0.302	0.27	0.609	0.75	0.397
Aboveground mass	0.87	0.364	0.30	0.590	0.78	0.388
Underground mass	0.69	0.416	0.00	0.991	0.12	0.732
(C) Forbs
Total mass	0.54	0.473	0.05	0.832	0.03	0.856
Aboveground mass	0.52	0.479	0.11	0.741	0.10	0.753
Underground mass	0.86	0.366	0.00	0.953	0.21	0.655

Values are in bold if P < 0.01 and in italics if P < 0.05. See Fig. 3 for data.