Composition of Periphyton Community on Water Hyacinth (Eichhornia crassipes): In Analysis of Environmental Characteristics at Ejirin Part of Epe Lagoon in Southwestern Nigeria

Table 1

Status of physicochemical parameters at Ejirin, part of Epe Lagoon, from December 2012 to May 2013.

Parameters	December	January	February	March	April	May	Mean	Standard deviation
Water temp. (^°C)	29.3	28.3	29	30.6	29.3	33.1	29.93	1.72
Transparency (cm)	43	57	41.5	38.5	34	31	40.8	9.11
Depth (cm)	25	28	30	27	30	26	27.7	2.07
pH	6.639	6.15	6.22	6.45	6.6	6.5	6.39	0.17
Conductivity (µs/cm)	0.192	0.154	0.2	0.006	0.2	0.35	0.18	0.11
TSS (mg/L)	55	66	170	73	1	1.1	61.01	62.09
TDS (mg/L)	0.65	79	87	141	119	161	97.94	56.95
Rainfall (mm)	13.2	0	28	50.1	165.3	340.8	99.57	132.25
Salinity ()	0	0	0	0.01	0	0	0.002	0.004
Nitrate (mg/L)	0.32	0.11	0.08	0.08	0.12	0.07	0.13	0.095
Phosphate (mg/L)	0.78	0.65	0.59	1.08	0.71	0.59	0.73	0.18
Sulphate (mg/L)	1.20	0.80	1.26	1.30	1.21	1.26	1.17	0.19
Silicate (mg/L)	0.40	0.80	0.11	0.05	0.05	0.06	0.25	0.30
Periphyton chl. a (mg/L)			0.003	0.001	0.003	0.003	0.0023	0.00096
Biological oxygen demand (mg/L)	4.8	0.4	2	3.7	2.2	0.8	2.32	1.68
Chemical oxygen demand (mg/L)	15	16	20	37	32	32	25.33	9.46
Dissolved oxygen (mg/L)	6.13	10	4.5	5	5.8	6	6.24	1.95