TABLE 3.

Distribution of phylogenetic groups among bacterial 16S rRNA gene clone libraries for three red water samples and a normal water sample^a

Phylum	Class	Order	Family	Genus	No. of clones (no. of OTUs) in sampleb:
					Z	J	S	D
Proteobacteria	Alphaproteobacteria	Caulobacterales	Caulobacteraceae	Caulobacter	1 (1)		1 (1)
				Brevundimonas			1 (1)
		Rhodospirillales	Unclassified		1 (1)	1 (1)
		Sphingomonadales	Sphingomonadaceae	Sphingomonas	4 (3)	2 (2)	7 (5)	1 (1)
				Novosphingobium	2 (1)
				Sphingopyxis	2 (1)	1 (1)	3 (2)
				Unclassified		1 (1)	3 (3)
		Rhodobacterales	Rhodobacteraceae	Rhodobacter	1 (1)
		Rhizobiales	Bradyrhizobiaceae	Afipia	1 (1)
			Hyphomicrobiaceae	Hyphomicrobium	1 (1)
			Brucellaceae	Ochrobactrum				1 (1)
			Unclassified		10 (3)		2 (2)	2 (1)
		Unclassified			2 (2)	4 (2)	5 (5)
	Betaproteobacteria	Rhodocyclales	Rhodocyclaceae	Rhodocyclus	2 (1)		2 (1)
				Ferribacterium			3 (1)	2 (2)
				Propionivibrio				4 (1)
				Unclassified	40 (7)	8 (5)	16 (9)	5 (5)
		Nitrosomonadales	Gallionellaceae	Gallionella	42 (15)	27 (13)	20 (11)
		Burkholderiales	Comamonadaceae	Curvibacter	1 (1)
				Rhodoferax			1 (1)	1 (1)
				Comamonas				1 (1)
				Simplicispira				1 (1)
				Unclassified	1 (1)			3 (3)
			Oxalobacteraceae	Herbaspirillum	14 (2)	2 (2)	6 (4)
		Unclassified			10 (7)	2 (2)	2 (2)	1 (1)
	Gammaproteobacteria	Legionellales	Legionellaceae	Legionella	1 (1)
			Coxiellaceae	Coxiella		1 (1)	1 (1)
		Pseudomonadales	Pseudomonadaceae	Pseudomonas	1 (1)	57 (11)		14 (6)
		Xanthomonadales	Xanthomonadaceae	Nevskia	4 (2)
				Hydrocarboniphaga			1 (1)
				Thermomonas				2 (2)
				Unclassified		1 (1)	3 (2)	1 (1)
		Unclassified			3 (1)		1 (1)
	Deltaproteobacteria	Desulfovibrionales	Desulfovibrionaceae	Desulfovibrio			1 (1)
				Unclassified			1 (1)
	Epsilonproteobacteria	Campylobacterales	Helicobacteraceae	Sulfuricurvum		2 (1)	16 (6)
	Unclassified				2 (2)	5 (1)	5 (5)	2 (2)
Bacteroidetes	Flavobacteria	Flavobacteriales	Flavobacteriaceae	Empedobacter	1 (1)
				Flavobacterium				9 (7)
				Cloacibacterium				1 (1)
				Unclassified				1 (1)
	Sphingobacteria	Sphingobacteriales	Sphingobacteriaceae	Sphingobacterium				3 (2)
				Pedobacter				1 (1)
			Flexibacteraceae	Dyadobacter				1 (1)
			Unclassified				1 (1)	5 (4)
Actinobacteria	Actinobacteria	Actinomycetales	Actinomycetaceae	Actinomyces		1 (1)
			Micrococcaceae	Arthrobacter				1 (1)
			Microbacteriaceae	Microbacterium				1 (1)
Planctomycetes	Planctomycetacia	Planctomycetales	Planctomycetaceae	Unclassified			1 (1)
Unclassified							4 (4)
Total					147 (57)	115 (45)	107 (72)	64 (48)

^aClassification was based on match results of RDP and the GenBank database.

^bA blank indicates that no related clones were obtained.