Impact of anthropogenic transformations on the vegetation of selected abiotic types of rivers in two ecoregions (Southern Poland) | Knowledge and Management of Aquatic Ecosystems

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Table 2

Spatial variables, the morphology of the riverbed, the values of the hydromorphological indices, the characteristics of the bottom sediments and the results of the Kruskal–Wallis and Dunn's multiple comparison post hoc tests (superscripts ^{a,b,c,d,e,f,g,h} denote significant differences between the rivers). Abbreviations: see Table 1.

Index/variables	Bolina	Centuria	Mitręga	Mleczna	Dziechcinka	Vistula	Korzenica	Wiercica	H-value	p-value
Altitude [m a.s.l.]	259–357	311–343	300–317	236–248	420–544	415–748	234–242	215–309	12.88	0.075
Stream gradient [‰]	8.43–10.89	3.00–5.73	2.99–3.78	2.83–3.98	76.94–87.17	45.59–177.50	2.14–3.92	2.00–3.17	11.87	0.105
Width of the riverbed [m]	4.405–7.780^g	3.300–5.945	2.866–6.129^h	4.411–9.359^g	3.486–4.550^h	3.473–19.800^g	1.846–4.061^a,d,h	5.969–12.051^c,e,g	37.86	<0.001
Depth of the riverbed [m]	0.214–0.344^d	0.100–0.586	0.400–0.613	0.368–1.092^a,e	0.193–0.316^d	0.262–0.576	0.383–0.850	0.067–0.983	25.06	<0.001
HIR	0.37–0.42	0.74–0.87	0.48–0.56	0.34–0.46	0.43–0.66	0.42–0.93	0.49–0.68	0.65–0.88	9.44	0.223
WRH	33.5–40.0	63.0–73.0	52.5–69.0	31.0–54.5	65.5–75.0	70.5–88.5	49.5–66.5	51.0–87.5	9.18	0.240
WPH	50.0–52.5	1.0–15.0	51.5–53.0	54.0–56.5	41.0–73.5	5.5–79.5	30.0–47.0	13.5–19.5	8.69	0.276
Fraction <0.002 mm [%]	2.00–24.00^{b,c,d,e,f,g,h}	0.00–0.00^a	0.00–0.00^a	0.00–4.90^a	0.00–0.00^a	0.00–0.00^a	0.00–0.00^a	0.00–3.00^a	147.72	<0.001
Fraction 0.002–0.02 mm [%]	4.00–58.00^{b,c,d,e,f,g,h}	0.00–0.00^a	0.00–0.00^a	0.00–11.80^a	0.00–0.00^a	0.00–0.00^a	0.00–0.00^a	0.00–4.00^a	147.30	<0.001
Fraction 0.02–0.1 mm [%]	3.00–13.00^b,c,e,f,g	0.63–1.70^a,d	0.30–2.50^a,d	3.20–22.80^b,c,e,f,g,h	0.17–2.50^a,d	0.09–1.15^a,d,g,h	0.15–15.20^a,d,f	0.10–24.80^d,f	109.65	<0.001
Fraction 0.1–0.25 mm [%]	2.30–32.90^e,f	17.68–32.01^c,e,f	3.67–23.20^b,d,f,h	11.70–52.80^c ^e,f	1.16–7.07^a,b,d,g,h	0.41–3.25^a,b,c,d,g,h	5.36–41.10^e,f	6.20–65.50^c,e,f	123.63	<0.001
Fraction 0.25–0.5 mm [%]	2.20–55.00^b,c	42.65–69.90^s,e,f	45.99–79.70^a,d,e,f,g,h	17.10–59.20^c,e,f	3.13–15.56^b,c,d,g,h	1.28–7.27^b,c,d,g,h	26.03–71.90^c,e,f	11.40–50.86^c,e,f	142.22	<0.001
Fraction 0.5–1 mm [%]	1.50–18.80	0.55–17.30	2.10–21.10^f,h	1.00–19.80	3.29–16.70	1.70–7.10^c	2.10–25.27^h	0.90–52.20^c,g	23.98	0.001
Fraction 1–2 mm [%]	0.00–3.00^c,d,e,f	0.08–1.80^c,d,e,f	0.50–2.20^e,f	0.70–7.80^a,b,e,h	5.26–16.95^a,b,c,d,g,h	2.47–14.72^a,b,c,g,h	0.30–10.18^a,b,e,f,h	0.00–3.90^d,e,f,g	125.34	<0.001
Fraction 2–5 mm [%]	0.00–0.70^c,d,e,f	0.00–0.80^d,e,f	0.10–1.20^a,e,f	0.00–8.45^a,b,e,f	7.24–27.82^a,b,c,d,g,h	3.52–20.26^a,b,c,d,g,h	0.00–9.04^e,f	0.00–1.22^e,f	124.14	<0.001
Fraction 5–10 mm [%]	0.00–0.30^e,f	0.00–1.90^e,f	0.10–0.80^e,f	0.00–10.06^e,f	6.35–21.83^a,b,c,d,g,h	3.16–15.35^a,b,c,d,g,h	0.00–6.77^e,f	0.00–2.61^e,f	114.54	<0.001
Fraction 10–20 mm [%]	0.00–0.00^e,f,h	0.00–6.04^e,f	0.00–1.80^e,f	0.00–18.90^e,f	9.77–28.04^a,b,c,d,g,h	8.49–32.97^a,b,c,d,g,h	0.00–3.39^e,f	0.00–10.78^a,e,f	122.09	<0.001
Fraction >20 mm [%]	0.00–0.00^e,f,g	0.00–20.44^e,f	0.00–28.67^e,f	0.00–6.13^e,f	1.06–37.95^a,b,c,d,h	19.05–72.85^a,b,c,d,g,h	0.00–40.27^a,f	0.00–20.77^e,f	105.35	<0.001

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