Relationships between benthic diatom assemblages’ structure and selected environmental parameters in Slovak water reservoirs (Slovakia, Europe) | Knowledge and Management of Aquatic Ecosystems

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Table 6

Results of ANOSIM and SIMPER analyses showing the differences between a priori defined groups, defining average similarity within each group and average dissimilarity between pairs of pre-defined groups; n = 156; sp – spring samples, su – summer samples, au – autumn samples.

Examined	A priori	Average	Compared	Average	ANOSIM	p	ANOSIM	p
parameter	defined groups	similarity (%)	pairs of groups	dissimilarity (%)	statistical R		global R
Groups of reservoirsdefined based on themain aim of usage	Multipurpose	18.23	Multipurpose/	88.69
	Multipurpose		Multipurpose/				0.534	***
	reservoirs		water-supply reservoirs

	Drinking water-	50.90
	supply reservoirs	50.90

	group (1)	26.86	1/2	83.62	0.174	***	0.376	***

	group (2)	18.22	2/3	93.43	0.757	***

	group (3)	58.87	1/3	79.94	0.557	***

Groups of reservoirs	group (4)	56.68	4/5	59.46	0.566	***

defined based on the	group (5)	52.75	1/4	77.93	0.324	**

results of CCA analyses			1/5	79.50	0.321	**

			2/4	91.91	0.656	***

			2/5	92.63	0.681	***

			3/4	54.43	0.451	***

			3/5	51.51	0.315	*

Seasonal variability	sp	17.48	sp/au	82.71	0.109	***	0.082	**

in multi-purpose	su	17.72	sp/su	83.32	0.058	ns

reservoirs	au	20.53	su/au	80.25	0.033	ns

Seasonal variability in	sp	50.27	sp/au	57.75	0.090	**	0.064	ns

drinking water-supply	su	52.97	sp/su	51.90	0.070	ns

reservoirs	au	54.05	su/au	45.25	–0.026	ns

Seasonal variability			sp/au		0.153	**	0.066	ns
Seasonal variability
in group 1			sp/su		–0.238	ns
in group 1
			su/au		0.016	ns

Seasonal variability			sp/au		0.129	***	0.113	***
Seasonal variability
in group 2			sp/su		0.162	∗
in group 2
			su/au		0.032	ns

Seasonal variability			sp/au		0.133	*	0.123	ns
Seasonal variability
in group 3			sp/su		0.109	ns
in group 3
			su/au		0.119	ns

Seasonal variability			sp/au		0.850	**	0.631	***
Seasonal variability
in group 4			sp/su		0.563	ns
in group 4
			su/au		–0.021	ns

Seasonal variability			sp/au		0.074	ns	0.022	ns
Seasonal variability
in group 5			sp/su		0.111	ns
in group 5
			su/au		–0.333	ns

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