Table 1.

ANOVA results for effects of heterogeneity of soil nutrients and density of plants on measures of growth and morphology of Alternanthera philoxeroides

	Heterogeneity (H)		Density (D)		H × D
	F1,28	P	F1,28	P	F1,28	P
Total mass	7·8	0·009	24·6	< 0·001	2·2	0·14
Root mass	8·4	0·007	23·3	< 0·001	2·1	0·16
Stolon mass	5·1	0·03	17·6	< 0·001	1·5	0·2
Leaf mass	7·7	0·01	29·2	< 0·001	2·9	0·10
Leaf area	4·6	0·04	23·4	< 0·001	1·5	0·2
Number of ramets	4·9	0·04	37·3	< 0·001	1·3	0·3
Stolon length	4·5	0·04	25·2	< 0·001	0·9	0·4
Number of new stolons	6·4	0·02	48·5	< 0·001	1·5	0·3
Internode length	0·7	0·4	0·6	0·4	0·009	0·9
Specific internode length	3·5	0·07	0·3	0·6	1·1	0·3
Specific leaf area	0·9	0·4	1·1	0·3	0·9	0·3
Root/shoot ratio	0·2	0·6	0·3	0·6	0·3	0·6

Values for which P < 0·01 are in bold type; values for which P < 0·05 are in italics. See Figs 2 and 3 for data.