Effect of culture and extract solutions of macrophytes on the growth of three common algae

Figures & data

Table 1. Results of the two-way ANOVA on the relative growth rate of three common algae.

Source of variation	Df	F	p
C. pyrenoidosa
Solution (A)	1	73.31	<0.001
Macrophyte (B)	6	8.21	<0.001
Interaction of A × B	6	7.08	<0.001
Error	28
Total	42
S. obliquus
Solution (A)	1	24.44	<0.001
Macrophyte (B)	6	20.14	<0.001
Interaction of A × B	6	15.02	<0.001
Error	28
Total	42
M. aeruginosa
Solution (A)	1	73.70	<0.001
Macrophyte (B)	6	72.33	<0.001
Interaction of A × B	6	11.77	<0.001
Error	28
Total	42
Note: The two factors were solution type (culture and extract) and macrophyte species (six treatments plus a control). df = degrees of freedom; F = F-ratio; p = level of significance.

Figure 1. The effect of culture solutions (a) and extract solutions (b) of six macrophytes on the growth of Chlorella pyrenoidosa (a: H. sibthorpioides; b: H. verticillata; c: V. natans; d: I. aquatica; e: M. verticillatum; f: J. repens; g: control).

Table 2. Mean relative growth rate of C. pyrenoidosa grown for 15 d in culture and extract solutions derived from six macrophytes (mean ± SE, n = 3).

Macrophyte treatment	RGR in culture solution		RGR in extract solution
Control	0.192 ± 0.021	a	0.192 ± 0.021	d
M. verticillatum	0.180 ± 0.022	ab	0.228 ± 0.009	cd
I. aquatica	0.171 ± 0.011	ab	0.322 ± 0.030	ab
V. natans	0.165 ± 0.018	ab	0.229 ± 0.041	cd
H. verticillata	0.136 ± 0.019	bc	0.289 ± 0.024	bc
J. repens	0.132 ± 0.014	bc	0.385 ± 0.031	a
H. sibthorpioides	0.086 ± 0.010	c	0.146 ± 0.025	d
Note: Different letters indicate significant differences at p < 0.05 amongst different species within the same solution.

Figure 2. The effect of culture solutions (a) and extract solutions (b) of six macrophytes on the growth of Scenedesmus obliquus. The legends are the same as in Figure 1.

Table 3. Mean relative growth rate of S. obliquus grown for 15 d in culture and extract solutions derived from six macrophytes (mean ± SE, n = 3).

Macrophyte treatment	RGR in culture solution		RGR in extract solution
Control	0.072 ± 0.011	c	0.072 ± 0.011	d
M. verticillatum	0.119 ± 0.013	a	0.140 ± 0.005	b
H. sibthorpioides	0.105 ± 0.004	ab	0.099 ± 0.002	c
V. natans	0.087 ± 0.004	bc	0.064 ± 0.007	d
I. aquatica	0.069 ± 0.004	c	0.101 ± 0.006	c
H. verticillata	0.066 ± 0.006	c	0.078 ± 0.008	d
J. repens	0.065 ± 0.007	c	0.165 ± 0.003	a
Note: Different letters indicate significant differences at p < 0.05 amongst different species within the same solution.

Figure 3. The effect of culture solutions (a) and extract solutions (b) of six macrophytes on the growth of Microcystis aeruginosa. The legends are the same as in Figure 1.

Table 4. Mean relative growth rate of M. aeruginosa grown for 15 d in culture and extract solutions derived from six macrophytes (mean ± SE, n = 3).

Macrophyte treatment	RGR in culture solution		RGR in extract solution
Control	0.054 ± 0.001	abc	0.054 ± 0.001	c
J. repens	0.070 ± 0.004	a	0.145 ± 0.001	a
I. aquatica	0.065 ± 0.003	ab	0.104 ± 0.011	b
M. verticillatum	0.064 ± 0.008	ab	0.128 ± 0.007	a
V. natans	0.046 ± 0.010	bc	0.060 ± 0.002	c
H. verticillata	0.038 ± 0.007	c	0.056 ± 0.008	c
H. sibthorpioides	− 0.008 ± 0.002	d	− 0.009 ± 0.002	d
Note: Different letters indicate significant differences at p < 0.05 amongst different species within the same solution.