TABLE 3.

Frequencies and phylogenetic affiliations of North Sea 16S rRNA clones^a

Phylogenetic group	No. (%) of clones	Next relative to cloneb	% 16S rRNA similarity
Bacteria	54 (100)
α-Proteobacteria	4 (7.5)
SAR116 clusterc	3	Unidentified alpha proteobacterium clone OM25d	95.5
Roseobacter	1	Marine bacterium strain SFR1e	97.9
γ-Proteobacteria	49 (92.5)
SAR86 clusterc	44 (83)
Group A	17	Unidentified gamma proteobacterium clone OM10d	97.8–99.2
Group B	27	Unidentified gamma proteobacterium clone OCS5 AF001651d	96.9–98.1
Thiomicrospira	2	Coxiella burnetiiD89795	88.4
Unknown affiliation	2	Clone of macroaggregate clone 44f	99.2
Unknown affiliation	1	Unidentified gamma proteobacterium clone OM60d	95.3
ɛ-Proteobacteria	1 (2)
Arcobacter	1	A. butzleri	92.2

^aObtained in September and November. 

^bIn the ARB database. 

^cReference 35. 

^dReference 42. 

^eReference 18. 

^fReference 12.