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Appendix 1

Species	Acronyms	S1	S2	S3	S4	S5	S6
Achnanthes brevipes Ag.	AB	+				+	+
Achnanthes coarctata (Breb).	AC						+
Achnanthes longipes Ag.	AL	+	+				+
Achnanthes trinodis	AT					+
Amphiprora alata, Kutz.	AA			+	+
Amphora cymbifera	AC1
Amphora ovalis, Kutz. var. affinis	AO	+	+		+	+	+
Amphora salina Wm. Sm.	AS		+			+
Aulacoseira granulata (Ehr.) Simonsen	AUG	+	+
Bacillaria paradoxa Gmelin	BP	+	+	+
Biddulphia laevis forma minor	BL					+
Campylodiscus hibernicus, Ehr.	CH			+	+
Cocconeis scutellum, Ehr.	COS	+				+
Cocconeis placentula	COP	+	+
Coscinodiscus radiatus. Ehr.	CR				+	+	+
Coscinodiscus subtilis, var. Normanii	CS		+
Cyclotella operculata	CO					+	+
Cyclotella meneghiniana, Kutz.	CM	+	+	+	+	+	+
Cymbella cymbiformis, Ehr.	CC		+
Cymbella obtusa Greg.	CO1				+
Cymbella parva (Smith) Wolle	CP			+
Cymbella tumida (Brebisson) Van Heurck	CT		+
Dictyoca sp.	DT				+
Diploneis ovalis (Hilse) Cleve	DO	+	+
Encyonema prostratum Ralfs.	EP			+	+
Epithema argus, Kutz.	EA			+	+
Epithema gibberula, var. producta	EG			+	+
Eunotia flexuosa, Kutz.	EF			+
Eunotia lunaris (Ehr.), Grun.	EL			+
Gomphonema affine Kutzing	GA	+	+
Gomphonema constricta	GC	+				+
Gomphonema gracile, var. dichotomum	GG		+
Gomphonema intricatum, Kutz.	GI		+
Licomophora paradoxa (Lyng).	LP					+
Licomophora tincta (Ag.), Grun.	LT					+
Mastogloia lanceolata, Thwaites.	ML		+
Melosira jurgensii var. octogona, Grun.	MJ	+			+	+	+
Melosira lineata (Dillwyn) C. Agardh	MLI		+
Melosira varians Agardh	MVR			+
Navicula ambigua, Kutz.	NAG				+	+
Navicula amphisbaena	NAM			+
Navicula amphisbaena, var. subsalina	NAV				+
Navicula atomoides, Grun.	NAT		+
Navicula bacillum Ehr.	NBC		+
Navicula bicapitata Lagerstedt	NBI	+
Navicula cuspidata, Kutz.	NCU		+
Navicula forcipata, Grev.	NFO	+	+	+	+	+	+
Navicula fusiformis Grun.	NFU			+
Navicula granulata, Breb.	NGN						+
Navicula gregaria, Donk.	NGR	+
Navicula integra (W. Smith) Ralfs	NIN	+	+
Navicula johnsonii (Wm. Sm.), var. belgica	NJO					+
Navicula lanceolata Kutz, forma curta	NLN		+
Navicula mutica, var. quinquenodis	NMU			+			+
Navicula permagna, Bailey	NPM	+	+
Nitzschia acicularis. Wm. Sm.	NIAC	+	+
Nitzschia apiculata (Greg.) Grun.	NIAP	+	+				+
Nitzschia atomoides	NIAT	+
Nitzschia compressa (Bailey) Boyer	NICM	+	+
Nitzschia constricta	NICT	+	+	+
Nitzschia fasciculata, Grun.	NIFS	+	+
Nitzschia linearis (Ag.) Wm. Sm.	NILI		+				+
Nitzschia obtusa, var. scalpelliformis	NIOB	+	+	+	+	+	+
Nitzschia palea (Kutz.) Wm. Sm.	NIPA		+
Nitzschia panduriformis Grun.	NIPN			+	+
Nitzschia sigma var. rigida	NISG	+	+				+
Nitzschia sigma var. rigida var. Intercedens	NISV	+
Nitzschia vermicularis (Kutz), Grun.	NIVR	+	+
Pinnularia joculata (Manguin) Krammer	PJ	+	+
Pinnularia sp.	PSP	+	+
Pleurosigma acutum norman	PAC	+
Pleurosigma angulatum, var. quadratum	PAN	+	+
Pleurosigma balticum, Wm. Sm.	PBL		+
Pleurosigma distortum	PDS		+
Pleurosigma elongatum, Wm. Sm.	PEL					+
Pleurosigma fasciola Wm. Sm.	PFS			+
Pleurosigma sp.	PSP.1					+	+
Raphoneis amphiceros	RAM		+		+
Spermatogonia sp.	SPR			+	+
Surirella robusta var. tenera	SUR			+	+
Surirella striatula, Turpin	SST	+		+	+
Synedra ulna (Nitzsch), Ehr.	SUL	+	+
Triceratium reticulatum	TR		+