Diagnosis of the Diatom Community upon Biofilm Development on Stainless Steels in Natural Freshwater

Table 4

Relative abundance of diatom species on the different SS types (“−” = absent; “+” = low; “++” = moderate; “+++” = high; “++++” = very high).

Species	304L	316L	254SMO
Melosira varians	++	+++	+++
Amphora ovalis	+++	++	++
Cocconeis placentula	++++	++++	++++
Cymbella sp.	+	+	+
Gyrosigma sp.	+	+	+
Nitzschia sigmoidea	++	+	+
Placoneis elginensis	−	+	+
Rhoicosphenia abbreviata (Agardh)	+	+	−
Synedra ulna	−	+	+