Table 2.

Glycoside Hydrolase (GH) families that were significantly different between biofilms at the level of individual transcripts (based on Rank Product fold change and p-value).

Greatest abundance	GH family	Substrate	Alpha- or Beta-linked sugars	Potential cellulase
Floating biofilms	GH3	β-glucans; cellulose; xylan; peptidoglycan	Beta	Yes
	GH5	β-glucans; mannose; cellulose; xylan	Beta	Yes
	GH7	β-glucans; cellulose; xylan	Beta	Yes
	GHII	xylan	Beta	n/a
	GHI6	β-glucans and β-galactans	Beta	n/a
	GH 16	β-glucans and β-galactans	Beta	n/a
	GH25	peptidoglycan	Beta	n/a
	GH27	α-galactose; α-N-acetylgalactosamine	Alpha	n/a
	GH35	β-galactose	Beta	n/a
	GH47	α-mannose	Alpha	n/a
	GH55	β-1,3-glucan	Beta	n/a
	GH72	β-1,3-glucan	Beta	n/a
	GH78	α-rhamnose	Alpha	n/a
	GH79	β-glucuronoside	Beta	n/a
	GH81	β-1,3-glucan	Beta	n/a
	GH92	α-mannose	Alpha	n/a
Streamer biofilms	GH I	β-glucosides; β-galactose; cellulose	Beta	Yes
	GH3	β-glucans; cellulose; xylan; peptidoglycan	Beta	Yes
	GH7	β-glucans; cellulose; xylan	Beta	Yes
	GH31	α-glucans	Alpha	n/a
	GHII 4	α-galactosamine	Alpha	n/a