Table 2.

Intradomain nucleotide signature features for the benthicArchaea 16S rDNA sequencesa

Position(s)bCrencEurycMarine planktonic group IdMarine benthic group:
Group I lineageGroup AeGroup BGroup CGroup DGroup E
27–556C-GG-CCrenCrenCrenCrenCrenEuryEury
28–555C-GG-YCrenCrenCrenCrenCrenEuryEury
30–553G-CY-RCrenCrenCrenCrenEuryEuryEury
501–544C-GR-YEuryEury (G-U)Eury (G-C)Eury (G-U)Eury (G-C)EuryEury
503–542G-CC-GCrenCrenCrenCrenCrenEuryEury
504–541G-YY-REuryEury (U-A)A-UA-UA-UEuryEury/Cren (G-C)f
513–538U-AC-GCrenCrenCrenCrenCrenG-UEury
518UCCrenCrenCrenEuryCrenEuryEury
658–747G-CY-RCrenCrenCrenCrenCrenEuryEury/Crenf
692CUEuryEuryEuryEuryEuryEuryEury
965GYCrenCrengAgEuryCrenEuryEury
1,074–1,083G-UA-CCrenCrengNDCrenCrenEuryEury
1,244–1,293R-YY-RCrenCrengNDCrenCrenEury (U-A)Eury (C-G)
1,252CUEuryEurygNDEuryEuryEuryA/Euryf
  • a Differences between benthic groups A, B, and C and planktonic group I and between benthic groups D and E are indicated in boldface.

  • b Numbering (nucleotide position) is based on the E. coli 16S rRNA sequence.

  • c Signature features of 16S rRNA gene sequences for the two archaeal kingdoms, Crenarchaeota (Cren) andEuryarchaeota (Eury) (59). R and Y represent purines and pyrimidines, respectively.

  • d Group I marine planktonic Archaeasignature features (9).

  • e Undetermined nucleotides are indicated by ND.

  • f Nucleotide signature features detected for clone APA6-17cm.

  • g Nucleotide signature features not detected for the ACA clones.