Shaping of macroinvertebrate structures in a small fishless lowland stream exposed to anthropopressure, including the environmental conditions | Knowledge and Management of Aquatic Ecosystems

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Table 1

Mean value and SD of abiotic and biotic factors observed on the sampling sites. O₂–oxygen dissolved, Cond − conductivity, NO₃–nitrates, NO₂–nitrites, NH₃–ammonia, N_TOT − total amount of nitrogen, PO₄–phosphates, P_TOT − total amount of phosphorus, Chla − chlorophyll a, Bottom − type of bottom: S − sandy, M − muddy, Veget − bottom cover by macrophytes, Macrophytes: most common macrophytes on site (ST − number of site, LR − Left Tributary, RT − Right Tributary).

	S1		S2		S3		S4		S5		S6		LT		RT

	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Width (m)	0.85	0.20	0.56	0.22	0.70	0.27	0.95	0.10	1.63	0.34	3.56	0.55	0.40	0.15	0.50	0.14
Depth (m)	0.20	0.06	0.23	0.13	0.24	0.17	0.29	0.16	0.34	0.07	0.32	0.11	0.11	0.05	0.14	0.09
Veloc (cm s⁻¹)	0.05	0.04	0.06	0.03	0.05	0.03	0.04	0.02	0.03	0.01	0.03	0.01	0.01	0.01	0.03	0.02
Disch (cm³ s⁻¹)	0.01	0.02	0.01	0.02	0.02	0.03	0.01	0.02	0.02	0.02	0.03	0.03	<0.01	0.00	<0.01	0.00
Temp (°C)	11.29	4.25	12.78	4.62	14.06	5.25	14.41	5.44	15.59	6.73	14.81	6.03	17.38	7.22	13.94	4.70
O₂ (mg l⁻¹)	10.24	1.97	10.77	2.29	8.79	3.17	10.51	2.36	8.48	1.94	6.91	2.74	7.25	1.27	2.87	1.13
pH	7.71	0.32	7.50	0.63	7.74	0.39	7.62	0.29	7.49	0.28	7.47	0.26	7.39	0.26	7.11	0.36
Cond (µS cm⁻¹)	964	181	1031	208	1039	223	1056	224	1073	235	1023	226	1052	372	931	147
NO₃ (mg l⁻¹)	0.89	0.43	1.00	0.69	1.05	0.66	0.90	0.58	0.89	0.43	0.81	0.31	0.77	0.24	0.62	0.23
NO₂ (mg l⁻¹)	0.01	0.00	0.01	0.00	0.01	0.00	0.01	0.00	0.01	0.00	0.01	0.01	0.01	0.01	0.01	0.01
NH₃ (mg l⁻¹)	0.04	0.05	0.04	0.03	0.04	0.04	0.06	0.03	0.05	0.02	0.43	0.57	0.05	0.03	1.64	1.40
N_TOT (mg l⁻¹)	1.29	0.69	1.36	0.93	1.41	0.96	1.18	0.69	1.13	0.49	1.64	0.81	1.03	0.24	2.66	1.82
PO₄ (mg l⁻¹)	1.66	1.56	1.49	1.27	1.32	0.88	0.99	0.76	1.18	0.81	1.68	1.02	1.40	1.02	2.77	1.24
P_TOT (mg l⁻¹)	4.41	4.60	4.34	4.21	3.40	2.69	2.63	2.02	3.03	2.03	4.62	3.05	3.48	2.83	7.25	3.56
Chla (µg l⁻¹)	25.48	4.92	28.76	6.40	28.70	6.33	36.09	5.94	63.01	17.13	73.29	23.65	69.33	15.34	46.19	9.04
Bottom %	100 % S		95% S, 5% M		70% S, 30% M		40% S, 60% M		50% S, 50% M		95% M, 5% S		100% S		90% M, 10%S
Veget (%)	48	38.12	94	10.94	85	25.79	73	35.54	48	29.89	39	25.23	87	22.51	62	27.57

Macrophytes	Nasturtium officinale		Nasturcium officinale, Carex sp., Glyceria maxima		Carex sp., Phragmites australis, Acorus calamus, Glyceria maxima, Typha latifolia		Phragmites australis, Acorus calamus, Glyceria maxima, Typha latifolia		Phragmites australis, Acorus calamus, Glyceria maxima, Typha latifolia, Callitriche palustris,		Acorus calamus, Glyceria maxima, Typha latifolia		Veronica beccabunga, Glyceria maxima, Phragmites australis		Glyceria maxima, Phragmites australis

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