Morphology of Reimeria ovata (Hust.) Levkov & Ector in comparison with similar Reimeria species

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Values of water physicochemical parameters in the Wołosaty stream and tributaries in 2013-2015, and description of sampling sites together with the most frequent accompanying diatom taxa (* below the limit of detection)

Streams		Wołosatka	Wołosaty	Rzeczyca	Terebowiec
Total number of sampling sites		2	4	1	2
Width	m	3-6	4-20	1.5-3	5-7
Depth		0.1-0.3	0.2-0.4	0.1-0.3	0.2-0.4
Type of the bottom		stones, at the first site stones covered with mosses in 30-40%	stones, at sites 5-6 stones covered with mosses and other algae from the genus Chlorophyta in 20-30%	stones	stones, at site 8, larger stones covered with mosses
Insolation		site 1 – low site 2 – high	high at all sites	low	site 8 – low site 9 – average
physicochemical parameters
Temperature	°C	8.0-12.2	5.6-10.8	7.4-10.0	6.1-9.3
pH		6.4-8.8	6.5-8.6	6.4-8.4	6.4-8.4
Conductivity	µS cm-1	78-254	146-278	97-246	86-284
O2	mg l-1	10.16-10.67	10.65-11.44	10.6-10.24	10.67-11.06
Cl-		0.43-5.33	0.65-5.35	0.60-5.31	0.41-5.59
SO42−<!-- - --> $\text {SO}^{2-}_4$		11.05-20.69	12.79-26.77	16.31-33.34	12.53-27.19
NO3−<!-- - --> $\text {NO}^{-}_3 $		1.67-2.46	1.94-3.15	1.78-3.20	2.01-2.86
PO42−<!-- - --> $\text {PO}^{2-}_4 $		*	*-0.64	*	*
NH4+ $\text {NH}^{+}_4 $		0.06-0.71	0.14-0.88	0.04-0.06	0.06-0.13
Mg2+		5.00-7.82	5.26-10.12	5.33-9.32	5.62-10.10
Ca2+		30.31-34.25	33.72-41.55	38.75-39.72	32.42-35.31
The most frequent taxa		Achnanthidium pyrenaicum, Cocconeis placentula var. lineata, C. placentula var. euglypta, Diatoma ehrenbergii	Achnanthidium pyrenaicum, A. minutissimum var. minutissimum, Cymbella parva, Diatoma ehrenbergii	Achnanthidium pyrenaicum, A. minutissimum var. minutissimum, A. thienemannii, Cymbella parva	Achnanthidium pyrenaicum, Diatoma ehrenbergii

Comparison of the valve morphology and occurrence of Reimeria sinuata with the other taxa from the genus Reimeria, recorded in the Wołosaty stream and tributaries

Taxa	Reimeria ovata (n=30)	Reimeria sinuata (n=30)	Reimeria uniseriata (n=10)
Length (µm)	12.4-31.0	8.9-14.2	16.5-26.5
Width (µm)	4.6-6.3	3.8-4.3	4.2-6.4
Number of striae in 10 µm	9-13 most commonly 10-11	12-15	7-9
Occurrence	Always as single cells, found on stones and most frequent on mosses.	Very rare, found on stones and mosses.	Very rare, found mostly on stones. The rarest of the three taxa found in the analyzed samples.