Table 1.

Summary of 16S rRNA-based clonal analyses of diversity of uncultivated bacteriaa

Habitat typeNo. of studiesBacterial divisionb
No. of sequencescProteobacteriad
αcβγδdɛeCytophagalesActinobacteriaLow-G+C gram positiveseAcidobacteriumVerrucomicrobiaSpirochetesNitrospiraGNSOP11PlanctomycetesGreen sulfurTM7TM6Thermus/DeinococcusCyanobacteriacSynergistesOP8Termite group IOS-KChlamydiaOP3OP10WS1OP5Marine group AFibrobacterFlexistipesDictyoglomusThermotogalesThermodesulfobacteriumAquificales
Geothermal10212
Soil16743
Marine23687
Freshwater4107
Wastewater5430
Pollutant associated7202
Acid metal leaching221
Subsurface6229
Symbionts and commensals10280
Disease associated37
 Totals862,918
  • a An expanded version of this table detailing individual studies is available athttp://crab2.berkeley.edu/∼pacelab/176.htm.

  • b Incidence of division-level representatives in studies of particular habitat types ranked from most represented to least represented divisions: >75% (•), 25 to 75% (○), or <25% (no symbol) of studies have representatives of division.

  • c Excluding organelles.

  • d Proteobacteria are presented at the subdivision level due to the extensive sequence representation of this division.

  • e Cannot establish as a monophyletic group in all analyses.