Table 1.

Mean nutrient concentrations (±standard deviation of mean) for ammonium (NH₄⁺), nitrite + nitrate (NO_X), and phosphate (PO₄^3-) recorded in the overlying water taken weekly in each environmental treatment for muddy and sandy sediments.

			Mud	Sand	Mud	Sand	Mud	Sand
CO2	Temperature	Week	NH4+	NH4+	(NOX)	(NOX)	PO43-	PO43-
(ppm)	(°C)		(μmol dm-3)	(μmol dm-3)	(μmol dm-3)	(μmol dm-3)	(μmol dm-3)	(μmol dm-3)
		1	10.02 ± 8.05	10.68 ± 6.46	10.41 ± 7.14	2.99 ± 3.62	0.13 ± 0.05	0.23 ± 0.17
380	12	2	18.19 ± 13.09	4.73 ± 5.15	24.98 ± 22.17	0.45 ± 0.52	0.16 ± 0.14	0.12 ± 0.16
		3	5.57 ± 8.06	5.23 ± 7.53	21.22 ± 10.61	0.72 ± 0.78	0.04 ± 0.03	0.12 ± 0.08
		4	6.47 ± 10.42	7.54 ± 10.23	27.52 ± 24.38	0.40 ± 0.32	0.05 ± 0.04	0.07 ± 0.04
		1	25.35 ± 16.42	8.28 ± 8.00	12.63 ± 6.60	21.40 ± 23.62	0.09 ± 0.03	0.94 ± 0.54
380	16	2	28.33 ± 45.25	6.04 ± 3.66	38.08 ± 10.30	15.52 ± 15.09	0.19 ± 0.05	0.71 ± 0.64
		3	3.67 ± 4.99	2.20 ± 3.18	49.73 ± 29.70	1.26 ± 2.70	0.26 ± 0.10	0.88 ± 0.80
		4	1.65 ± 3.47	1.43 ± 2.64	43.00 ± 30.98	2.39 ± 3.60	0.24 ± 0.17	1.15 ± 0.67
		1	15.47 ± 15.14	10.30 ± 8.76	6.03 ± 3.94	14.10 ± 20.05	0.07 ± 0.04	0.87 ± 0.51
750	12	2	18.58 ± 15.95	8.08 ± 8.10	22.79 ± 6.65	4.80 ± 5.64	0.10 ± 0.06	0.36 ± 0.54
		3	22.57 ± 16.70	9.00 ± 9.23	37.02 ± 15.70	1.02 ± 2.11	0.08 ± 0.08	0.47 ± 0.69
		4	4.14 ± 5.33	6.86 ± 10.58	39.47 ± 17.97	1.37 ± 2.12	0.09 ± 0.05	0.92 ± 0.59
		1	7.58 ± 8.77	5.46 ± 6.43	14.48 ± 14.33	1.09 ± 1.08	0.20 ± 0.11	0.18 ± 0.13
750	16	2	13.92 ± 23.29	2.58 ± 5.23	20.92 ± 22.04	0.40 ± 0.63	0.12 ± 0.14	0.28 ± 0.48
		3	5.26 ± 7.72	4.98 ± 8.24	31.25 ± 33.39	0.73 ± 0.42	0.04 ± 0.03	0.06 ± 0.05
		4	2.32 ± 2.94	2.94 ± 3.12	34.34 ± 39.46	0.59 ± 0.39	0.08 ± 0.10	0.08 ± 0.06

Observations are shown for the light period only, as the means in the light and dark phase did not show any significant difference.