Residues, Distributions, Sources, and Ecological Risks of OCPs in the Water from Lake Chaohu, China

Table 2

The statistical characteristics of the log-transformed toxicity data for typical OCPs (𝜇g/L).

	p,p′-DDT			γ-HCH			Heptachlor
	Numbers	Mean	SD	Numbers	Mean	SD	Numbers	Mean	SD
All species	151	1.782	1.148	122	2.323	1.068	48	2.08	1.11
Vertebrates	62	1.802	1.083	60	2.475	0.896	32	2.11	0.65
Invertebrates	89	1.769	1.196	62	2.175	1.201	16	1.79	0.93
Fishes	57	1.678	1.022	54	2.352	0.854	31	2.09	0.65
Crustaceans	28	1.496	1.127	20	2.048	1.151	8	1.67	0.48
Insects and spiders	50	1.516	0.939	28	1.509	0.663	6	1.48	1.14
	Aldrin			Endrin
	Numbers	Mean	SD	Numbers	Mean	SD
All species	55	2.08	1.11	83	83	83
Vertebrates	31	1.72	0.66	46	46	46
Invertebrates	24	2.54	1.39	37	37	37
Fishes	29	1.64	0.58	40	40	40
Crustaceans	13	2.59	1.71	10	10	10
Insects and spiders	6	1.71	0.55	21	21	21

SD = Standard deviation.