Table 2 The dominant species (mean % for the growth season) in phytoplankton density (A) and biomass (B) in the Kuźnica clarification pond in 2014–2019.

Species	Phylum	FGs	2014	2015	2016	2017	2018	2019
(A) Relative density
Cyclotella meneghiniana	Bacillariophyta	C	35	13	39	49	15	65
Nitzschia palea	Bacillariophyta	D	23	6	3	1	2	2
Chlamydomonas reinhardtii	Chlorophyta	X2	–	56	–	13	14	4
Kirchneriella irregularis	Chlorophyta	F	–	19	26	16	11	1
Monoraphidium contortum	Chlorophyta	X1	10	–	–	2	1	37
Cryptomonas erosa	Cryptophyta	Y	3	1	9	1	3	1
Plagioselmis nannoplanctica	Cryptophyta	X2	–	3	17	14	41	16
Uroglenopsis americana	Ochrophyta	U	–	–	–	–	–	8
(B) Relative biomass
Cyclotella meneghiniana	Bacillariophyta	C	39	10	34	54	9	40
Staurosira construens	Bacillariophyta	MP	18	–	–	–	1	–
Ulnaria ulna	Bacillariophyta	MP	–	1	1	1	25	3
Nitzschia palea	Bacillariophyta	D	10	2	1	1	1	2
Chlamydomonas reinhardtii	Chlorophyta	X2	–	60	–	18	2	1
Cryptomonas erosa	Cryptophyta	Y	7	2	16	1	15	14
Plagioselmis nannoplanctica	Cryptophyta	X2	–	1	4	4	7	6
Trachelomonas armata	Euglenozoa	W2	21	–	–	–	–	–
Ceratium hirundinella	Miozoa	L_O	–	–	27	-	14	–
Peridinium cinctum	Miozoa	L_O	–	19	6	9	1	–
Uroglenopsis americana	Ochrophyta	U	–	–	–	–	–	11

FGs functional groups (Reynolds et al. 2002, Padisák et al. 2009) and habitat template of coda, C eutrophic small- and medium sized lakes with species sensitive to the onset of stratification, D shallow turbid waters including rivers, F clear, deeply mixed meso-eutrophic lakes, X1 shallow, eu hypertrophic environments, X2 shallow, meso-eutrophic environments, Y this codon, mostly including large cryptomonads but also small dinoflagellates, refers to a wide range of habitats, which reflect the ability of its representative species to live in almost all lentic ecosystems when grazing pressure is low, MP frequently stirred up, inorganically turbid shallow lakes, W2 meso-eutrophic ponds, even temporary, shallow lakes, L_O deep and shallow, oligo to eutrophic, medium to large lakes, U stratifying oligotrophic and mesotrophic lakes, where nutrient resources are exhausted in the upper layers but still available in the darker deep ones, the essential adaptation under these conditions is the combination of motility with large size, – not observed.

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