Factors associated with blooms of cyanobacteria in a large shallow lake, China

Li, Di; Wu, Naicheng; Tang, Song; Su, Guanyong; Li, Xuwen; Zhang, Yong; Wang, Guoxiang; Zhang, Junyi; Liu, Hongling; Hecker, Markus; Giesy, John P.; Yu, Hongxia

doi:10.1186/s12302-018-0152-2

Environmental Sciences Europe

Table 4 Results of the best approximating generalized linear model (GLM), with Gaussian error distribution to explain the variation in phytoplankton indices (n = 84) and densities of dominant taxa

From: Factors associated with blooms of cyanobacteria in a large shallow lake, China

Chl a	Variables	Intercept	WT	DO	Conductivity	BOD₅	TP	As
	t value	− 3.279**	4.387***	3.349**	− 2.381*	4.59***	3.87***	− 3.379**
	AIC	869.64
S	Variables	Intercept	WT	pH	DO	BOD₅	TP	As	NPR
	t value	2.447*	2.829**	− 2.509*	1.841	1.508	− 1.827	1.471	1.787
	AIC	495.25
D _s	Variables	Intercept	WT	DO	BOD₅	TP	F⁻
	t value	2.593*	− 1.543	− 1.848	− 1.375	− 2.654**	1.752
	AIC	− 9.23
H′	Variables	Intercept	BOD₅	MC-LR	NPR
	t value	9.066***	− 2.264*	− 2.482*	3.024**
	AIC	136.04
J	Variables	Intercept	BOD₅	MC-LR	NPR
	t value	10.15***	− 2.524*	− 2.439*	2.02*
	AIC	− 135.33
D _b	Variables	Intercept	BOD₅	MC-LR	NPR
	t value	6.044***	− 1.966	− 2.401*	3.676***
	AIC	− 71.62
Total density	Variables	Intercept	WT	SD	DO	Conductivity	COD_Mn	BOD₅	NH₄⁺− N	TP	As	MC-LR
	t value	− 2.304*	4.467***	− 1.875	4.078***	− 1.607	− 4.226***	8.436***	− 1.628	1.836	− 2.322*	1.868
	AIC	2169.30
Microcystis sp.	Variables	Intercept	WT	SD	DO	Conductivity	COD_Mn	BOD₅	NH₄⁺− N	TP	As	MC-LR
	t value	− 2.246*	4.366***	− 1.828	3.938***	− 1.722	− 4.133***	8.402***	− 1.786	1.825	− 2.24*	1.854
	AIC	2163.82
Anabaena flos-aquae	Variables	Intercept	COD_Mn	BOD₅	TP	F⁻
	t value	− 2.65**	− 2.662**	2.514*	2.152*	3.893***
	AIC	1860.70
Planctonema sp.	Variables	Intercept	WT	BOD₅	TN	As
	t value	1.045	1.955	− 2.176*	1.42	− 1.523
	AIC	1624.20
Melosira sp.	Variables	Intercept	WT	pH	DO	TN	TP
	t value	− 0.195	3.929***	− 1.533	3.394**	2.375*	− 2.529*
	AIC	1245.40
Cyanophyta	Variables	Intercept	WT	SD	DO	Conductivity	COD_Mn	BOD₅	NH₄⁺–N	TP	As	MC-LR
	t value	− 2.288*	4.357***	− 1.794	4.019***	− 1.654	− 4.185***	8.422***	− 1.662	1.874	− 2.233*	1.829
	AIC	2170.00
Chlorophyta	Variables	Intercept	WT	BOD₅	As
	t value	1.969	2.468*	− 1.444	− 2.189*
	AIC	1626.10
Bacillariophyta	Variables	Intercept	TN
	t value	0.748	1.627
	AIC	1503.20
P.Microcystis sp.	Variables	Intercept	WT	BOD₅	TN	COD_Cr	F⁻	Pb	MC-LR
	t value	3.071**	1.976	3.08**	− 2.409*	− 1.926	− 1.63	− 1.483	2.538*
	AIC	807.26
P.Anabaena flos-aquae	Variables	Intercept	WT	SD	COD_Cr	F
	t value	− 1.77	− 3.129**	− 2.739**	2.466*	4.945***
	AIC	712.85

Selected variables, t values and AIC are given. Significance was expressed as p < 0.1, * p < 0.05, ** p < 0.01, and *** p < 0.001. The best approximating model was selected by Akaike’s information criterion (AIC)

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