Table 2. Average ± sd of sediment chlorophyll-a, measured and estimated sediment processes and macrobenthic parameters for each of the factors (pH treatment, Month, Sediment or their interactions) with a significant effect.

	pH		Month	Month×pH		Sediment	Sediment×Month		Sediment×Month×pH
Chlorophyll- a	-		-			-			Permeable	February	Control	0.05±0.07
											Acidified	0.02±0.03
										April	Control	0.13±0.07
											Acidified	0.13±0.04
									Fine sandy	February	Control	0.29±0.04
											Acidified	0.68±0.33
										April	Control	0.81±0.47
											Acidified	11.03±4.48
SCOC (mmol O2 m−2 d−1)	Control	11.73±8.09	-			Permeable	February	5.87±4.98	-
	Acidified	6.63±7.45					April	1.25±2.36
						Fine sandy	February	10.33±3.57
							April	19.26±3.21
NHx efflux (mmol N m−2 d−1)	-		February		1.09±1.55	Permeable		0.31±0.39	-
			April		1.00±1.00	Fine sandy		1.79±1.41
NOx efflux (mmol N m−2 d−1)	-		-			Permeable	February	8.66±1.22	-
							April	0.25±0.47
						Fine sandy		3.04±2.53
Nitrification (mmol N m−2 d−1)	-		February	Control	3.74±2.21	Permeable	February	3.15±2.36	-
				Acidified	0.22±1.14		April	0.02±0.87
			April		0.87±1.24	Fine sandy		1.17±1.72
N mineralization (mmol N m−2 d−1)	-		-			Permeable	February	4.88±1.23	-
							April	0.42±0.64
						Fine sandy		2.97±0.84
Density (ind. m−2)	-		February		725±879	Permeable		44±41	-
			April		370±412	Fine sandy		1050±659
Biomass (g m−2)	-		-			Permeable		3±5	-
						Fine sandy		189±137
Species richness (core−1)*	-		-			Permeable	*per 283.53 cm2	1.13±0.99	-
						Fine sandy	*per 78.54 cm2	3.13±1.25
BPc (m−2)	-		February		898±1102	Permeable		57±51	-
			April		601±671	Fine sandy		1442±785