Differences in water depth determine leaf-litter decomposition in streams: implications on impact assessment reliability | Knowledge and Management of Aquatic Ecosystems

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Table 1

Results from the linear model analyses for effects of depth and stream on measured variables during autumn-winter and spring. Significant values are highlighted in bold.

		Autumn			Spring

		df	F	p	df	F	P
Decomposition rate (d ^-1 )	Depth	1,36	10.53	0.003	1,39	5.62	0.022
	Stream	2,36	1.36	0.268	2,39	5.52	0.007
	Depth × Stream	2,36	0.75	0.48	2,39	3.69	0.034

log Total density (no. ind)	Depth	1,37	0.37	0.546	1,38	0.19	0.669
	Stream	2,37	0.10	0.906	2,38	11.55	< 0.001
	Depth × Stream	2,37	1.57	0.222	2,38	0.06	0.943

log Shredder density (no. ind)	Depth	1,37	3.62	0.065	1,38	0.18	0.672
	Stream	2,37	1.25	0.299	2,38	2.50	0.095
	Depth × Stream	2,37	2.37	0.107	2,38	0.59	0.561

log Total biomass (mg)	Depth	1,36	12.99	0.001	1,38	2.93	0.095
	Stream	2,36	0.68	0.511	2,38	1.76	0.187
	Depth × Stream	2,36	0.94	0.400	2,38	0.05	0.952

log Shredder biomass (mg)	Depth	1,35	10.66	0.002	1,38	2.32	0.136
	Stream	2,35	0.30	0.745	2,38	3.18	0.053
	Depth × Stream	2,35	0.34	0.714	2,38	0.03	0.972

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