Table 3.

The most abundant operational taxonomic units (OTUs) per niche: (a) supragingival plaque, (b) buccal mucosa, (c) tongue dorsum mucosa and (d) saliva

OTU	Assigned Taxonomy (Family/Genus/Species)	Percentage identity	Total Number of Sequence Reads	Proportion of total sequence reads (%)
(a) Supragingival plaque
1431	Filifactor villosus	100.0	77,015	5.16
11,671	Porphyromonas cangingivalis	100.0	72,538	4.86
31,443	unclassified Proteocatella sp. [novel 1]	100.0	63,923	4.28
4989	unclassified Bergeyella sp. [novel 1]	100.0	61,339	4.11
26,919	Peptostreptococcaceae bacterium COT-005/004	100.0	50,964	3.41
30,902	Clostridiales bacterium FOT-072	100.0	50,429	3.38
9772	Peptostreptococcaceae bacterium COT-047	100.0	48,193	3.23
2753	Synergistales bacterium COT-178	100.0	45,641	3.06
12,643	unclassified Capnocytophaga sp. [novel]	100.0	43,829	2.94
28,248	Peptostreptococcaceae bacterium COT-019	100.0	40,047	2.68
1876	unclassified TM7/Saccharibacteria sp. [novel 3]		35,634	2.39
30,023	TM7 phylum sp. COT-305	100.0	34,574	2.32
(b) Buccal mucosa
21,524	unclassified Pasteurellaceae sp. [novel 1]	100.0	164,340	12.87
21,526	Conchiformibius steedae [novel 1]	99.77	105,564	8.26
10,354	Conchiformibius sp. COT-286	100.0	47,684	3.73
4989	unclassified Bergeyella sp. [novel 1]	100.0	45,849	3.59
11,671	Porphyromonas cangingivalis	100.0	37,199	2.91
9478	Cloacibacterium sp. COT-320	99.76	36,618	2.87
31,690	unclassified Porphyromonas sp. [novel 1]	100.0	30,684	2.40
14,028	Streptococcus sp. COT-297	100.0	30,222	2.37
12,584	unclassified Moraxella sp. [novel]	99.07	26,517	2.08
9619	Porphyromonas canoris	100.0	26,133	2.05
10,651	Moraxella sp. FOT-350	100.0	24,867	1.95
404	unclassified Abiotrophia sp. [novel]	100.0	24,011	1.88
25,705	Capnocytophaga sp. COT-339	100.0	18,703	1.47
1431	Filifactor villosus	100.0	18,253	1.43
(c) Tongue dorsum mucosa
10,354	Conchiformibius sp. COT-286	100.0	86,824	17.27
15,352	unclassified Conchiformibius sp. [novel 3]	100.0	28,290	5.63
21,524	unclassified Pasteurellaceae [novel 1]	100.0	24,193	4.81
1774	Streptococcus sp. COT-279	100.0	21,251	4.23
4989	unclassified Frederiksenia [novel 1]	100.0	18,416	3.66
25,622	unclassified Frederiksenia [novel 1]	100.0	18,370	3.65
16,272	Conchiformibius sp. COT-289	100.0	17,915	3.56
10,651	Moraxella sp. FOT-350	100.0	17,208	3.42
11,671	Porphyromonas cangingivalis	100.0	15,897	3.16
(d) Saliva
30,042	unclassified Escherichia-Shigella sp. [novel 1]	100.0	95,822	20.46
1382	Streptococcus minor	100.0	72,087	15.40
11,144	unclassified Neisseria sp. [novel 1]	100.0	62,356	13.32

Represent approximately 50% of the total respective sequence reads in each niche. (a) supragingival plaque, (b) buccal mucosa, (c) tongue dorsum mucosa and (d) saliva