Table 4.

Major 16S rDNA phylotypes associated with sulfate-reducing bacteria

δ-ProteobacteriaPresence in or absence from indicated sample in 16S rDNA library (reference):
Eel-TE Eel-BEEel-36eaSB-24eaODPB (3) GCAbJTB (26) TAYNAYA (6) sva (47)
Eel-Hpc4 (0–4 cm)Eel-Hpc4 (22 cm)Eel-pc36 (4–7 cm)SB-pc24 (13–16 cm)Gas hydrate sediment from
the Cascadia Margin
Hydrocarbon seep sedimentsJapan Trench cold seep sedimentsAntarctic fjord sedimentsShelf sediment from the Arctic Ocean
Desulfosarcina + + ++ + + + + +
Seep Eel-1 + + +
Desulfobulbus + + + +
Seep Eel-2 + + +
Seep Eel-3 + + +
Myxobacterium + ++
  • a Fatty acids associated with sulfate-reducing bacteria (10, 40) detected in methane seep sediment samples included n-C14:0, n-C16:1 (ω:5), and 10Me-C16:0. Levels of δ-13C in sedimentary fatty acids ranged from −52 to −103‰. Note that δ-13C levels in photosynthetically derived lipids are approximately −25‰.

  • b Data are from K. R. O'Neill (GenBank database accession no. AF154080 to AF154106).