Physicochemical Process, Crustacean, and Microcystis Biomass Changes In Situ Enclosure after Introduction of Silver Carp at Meiliang Bay, Lake Taihu

Table 1

pH, dissolved oxygen (DO), total dissolved solids (TDS), and Secchi depth () were measured during this experiment among each treatment. Significant differences compared between treatments and control groups were presented as means ± STDEV with different minuscules.

Parameters	Treatments	Means ± STDEV	Levene’s test of variance of homogenous		-test of means compared with control group
				Sig.		df	(two tails)
pH	CG	8.19 ± 0.42 (a)	—	—	—	—	—
	LDG	8.00 ± 0.40 (a)	0.506	0.481	1.602	46	0.116
	MDG	7.93 ± 0.36 (b)	1.508	0.226	2.284	46	0.027
	HDG	8.03 ± 0.39	0.400	0.530	1.319	46	0.194
DO (mg/L)	CG	7.72 ± 3.42 (a)	—	—	—	—	—
	LDG	6.21 ± 1.71 (a)	5.258	0.026	1.930	33.872$	0.062
	MDG	5.73 ± 2.23 (b)	2.099	0.154	2.384	46	0.021
	HDG	6.03 ± 2.17 (b)	2.129	0.151	2.036	46	0.048
TDS (g/L)	CG	0.42 ± 0.06	—	—	—	—	—
	LDG	0.45 ± 0.11	1.520	0.224	−1.004	46	0.321
	MDG	0.44 ± 0.10	1.010	0.320	−0.606	46	0.547
	HDG	0.40 ± 0.10	0.402	0.529	1.208	46	0.233
(cm)	CG	68.7 ± 9.9 (a)	—	—	—	—	—
	LDG	83.3 ± 12.7 (b)	0.088	0.768	−4.390	46	0.000
	MDG	75.2 ± 12.9 (b)	1.704	0.198	−1.950	46	0.057
	HDG	65.6 ± 12.7 (a)	0.856	0.360	0.956	46	0.344

$, variance was not equal.