Macrophytes as a tool for assessing the trophic status of a river: a case study of the upper Oum Er Rbia Basin (Morocco)

Nouri, Ayoub; Soumaya, Hammada; Lahcen, Chillasse; Abdelmajid, Haddioui

doi:10.2478/oandhs-2021-0008

Figures & Tables

Canonical correspondence analysis (CCA) diagram showing the correlation between Macrophytes distribution and physicochemical parameters. AgroSto – Agrostis stolonifera, PersAmph – Persicaria amphibia, GroDen – Groenlandia densa, MyrSpic – Myriophyllum spicatum, NastOffc – Nasturtium officinale, RanAqua – Ranunculus aquatilis, SpirSp – Spirogyra sp., DiatSp – Diatoma sp., CladSp – Cladophora sp., UlvaSp – Ulva sp., StuPect – Stuckenia pectinata, TyphAng – Typha angustifolia, TyphLng – Typha latifolia, ZanPal – Zannichelia palustris, NostcSp – Nostoc sp., VauchSp – Vaucheria sp., BrachyRv – Brachythecium rivulare

Graph showing the IBMR values for each site and the trophic level thresholds

The IBMR ranges with the corresponding trophic status (AFNOR 2003)

IBMR	> 14		12 < X ≤ 14		10 < X ≤ 12		8 < X ≤ 10		≤ 8
trophic status	very low		low		moderate		high		very high

Pearson's correlation coefficients between IBMR values and physico-chemical parameters of water (n = 36)

	IBMR
	r	p
NO₂-N	−0.696^*	0.012
PO₄-P	−0.230	0.472
NO₃-N	0.696^*	0.012
WT	−0.844^**	0.001
DO	0.694^*	0.012
pH	0.372	0.234
EC	−0.806^**	0.002
COD_Mn	−0.854^**	0.000
NH₃-N	−0.330	0.295

List of macrophyte contributive species that were recorded in the upper Oum Erbia basin

Scientific Name	Family	Amg01	Amg02	Amg03	Amg04	Orb01	Orb02	Orb03	Orb04	Orb05	Orb06	Sru01	Sru02
Vascular plants
Myriophyllum spicatum	Haloragaceae	x	x	x	x			x
Ranunculus aquatilis	Ranunculaceae	x	x
Groenlandia densa	Potamogetonaceae	x	x	x	x
Potamogeton pectinatus	Potamogetonaceae						x	x		x	x
Nasturtium officinale	Brassicaceae	x	x	x	x	x	x	x	x	x
Zannichellia palustris	Zannichelliaceae	x	x		x	x	x	x	x	x
Persicaria amphibia	Polygonaceae			x
Typha angustifolia	Typhaceae											x
Typha longifolia	Typhaceae											x
Agrostis stolonifera	Poaceae			x
Algae
Cladophora sp.	Cladophoraceae		x	x	x		x	x	x	x	x	x	x
Spirogyra sp.	Zygnemataceae		x	x		x		x		x	x		x
Vaucheria sp.	Vaucheriaceae		x	x	x	x	x	x	x	x	x	x	x
Nostoc sp.	Nostocaceae					x		x
Diatoma sp.	Tabellariaceae	x	x				x	x		x	x	x	x
Ulva sp.	Ulvaceae						x	x	x	x	x	x	x
Bryophytes
Brachythecium rivulare	Brachytheciaceae					x	x	x	x	x	x	x	x
Total number of species in each site		6	9	8	6	6	8	11	5	8	6	6	5

Descriptive statistics of the physicochemical parameters of the surveyed sites in the upper Oum Erbia basin

		pH	WT (°C)	EC (μS cm⁻¹)	DO (mgO₂ l⁻¹)	COD (Mn) (mgO₂ l⁻¹)	NH₃-N (μg l⁻¹)	NO₂-N (μg l⁻¹)	NO₃-N (mg l⁻1)	PO₄-P (μg l⁻¹)
Amg01	Mean	8.12	12.50	283.50	10.53	3.68	105	74.02	5.98	330
	Range	6.3–9.98	7.1–17.9	259–308	8.53–12.53	0.32–7.04	60–150	72.38–75.67	3.63–8.32	130–530
	SD	0.75	7.64	34.65	2.82	4.75	63.64	2.33	3.31	282.84
Amg02	Mean	7.92	12.98	380.50	9.65	5.04	12.5	69.19	7.51	430
	Range	7.41–8.72	8.0–16.8	321–421	7.16–13.56	0.00–11.52	0.00–30	55.93–82.64	3.73–12.47	0.00–1460
	SD	0.60	3.65	44.25	2.74	4.86	15	13.56	3.80	696.32
Amg03	Mean	7.91	15.15	404.75	8.23	5.52	62.50	126.76	9.97	485
	Range	7.51–8.59	10.3–19.6	323–459	6.30–10.54	0.00–10.88	0.00–230	85.93–171	6.24–14.64	140–870
	SD	0.48	3.80	58.64	1.75	4.49	112.06	35.23	3.47	301.16
Amg04	Mean	7.86	17.30	772.75	7.95	6.00	20	117.12	7.23	415
	Range	7.47–8.24	10.3–23.0	516–1348	6.09–10.14	0.32–10.56	0.00–80	72.38–154.6	3.16–15.60	160–850
	SD	0.33	5.24	390.63	1.67	4.28	40	41.11	5.74	319.84
Orb01	Mean	7.70	14.98	1781.50	8.87	3.60	0.00	25.50	6.64	50
	Range	7.45–8.10	13.2–15.7	1587–1974	7.72–10.67	1.92–5.12	0.00	0.00–62.51	3.33–10.50	0.00–140
	SD	0.28	1.19	162.49	1.31	1.60	0.00	26.91	3.06	66.33
Orb02	Mean	7.78	15.23	1961.50	8.77	5.92	0.00	110.86	5.88	280
	Range	7.46–8.22	12.8–16.4	1646–2308	8.0–10.32	0.96–9.60	0.00	52.64–175.7	3.31–10.02	170–510
	SD	0.32	1.65	292.73	1,07	4,23	0.00	53.50	2.99	157.06
Orb03	Mean	7.89	16.45	2188.25	8.52	6.40	32.50	124.09	6.33	162.50
	Range	7.40–8.58	13.4–19.2	1695–2597	6.71–10.83	0.96–11.52	0.00–70	39.48–239.5	4.95–8.96	60–290
	SD	0.51	2.44	371.51	1.71	4.47	37.75	84.65	1.85	96.40
Orb04	Mean	7.88	17.58	2225.25	7.46	7.60	10	156.72	4.49	395
	Range	7.68–8.26	13.5–22.2	1687–2651	6.75–8.81	1.92–10.88	0.00–40	123.03–198.6	3.85–4.97	40–630
	SD	0.26	3.70	400.76	0.92	4.16	20	31.65	0.51	264.90
Orb05	Mean	7.80	18.13	2286.67	7.56	6.82	3.33	161.63	4.56	280
	Range	7.58–8.15	13.2–21.1	1989–2763	6.50–9.02	3.20–10.24	0.00–10	129.6–178.9	4.24–4.73	20–640
	SD	0.30	4.30	416.79	1.31	3.52	5.77	27.76	0.27	321.87
Orb06	Mean	7.9	19.97	2339.33	7.21	6.29	45	113	7.55	487.50
	Range	7.77 – 8.12	12.4 – 24.4	1829–2959	6.50–7.98	1.92–10.88	10–90	19.74–175.7	2.36–11.23	150 –1100
	SD	0.19	6.59	572.88	0.74	4.48	34.16	72.37	4.62	419.07
Sru01	Mean	7.89	19.03	1695.67	7.39	6.93	22.50	54.28	2.39	190
	Range	7.61–8.44	10.6–23.8	695–2708	6.68–8.33	4.16–11.52	0.00–50	0.00–82.25	1.89–2.92	20–490
	SD	0.48	7.32	1006.55	0.85	4.00	20.62	37.07	0.51	223.16
Sru02	Mean	8.11	22.97	4100.00	7.77	10.35	200	213.85	4.90	520
	Range	7.71–8.63	12.3–29.2	2340–6504	6.30–9.98	5.12–13.76	160–270	62.51–417.8	0.18–9.17	350–860
	SD	0.47	9.28	2090.28	1.95	4.59	60.83	183.41	4.50	294.45

Macrophytes as a tool for assessing the trophic status of a river: a case study of the upper Oum Er Rbia Basin (Morocco)

Figures & Tables

Figure 1

Figure 2

Figure 3

The IBMR ranges with the corresponding trophic status (AFNOR 2003)

Pearson's correlation coefficients between IBMR values and physico-chemical parameters of water (n = 36)

List of macrophyte contributive species that were recorded in the upper Oum Erbia basin

Descriptive statistics of the physicochemical parameters of the surveyed sites in the upper Oum Erbia basin

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