Journal
BMC MICROBIOLOGY
Volume 11, Issue -, Pages -Publisher
BMC
DOI: 10.1186/1471-2180-11-137
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Funding
- Ghent University [BOF08/DOC/016, BOF09/GOA/005]
- National High-Tech Program of China [2007AA091904]
- China State Key Laboratory of Ocean Engineering [AE010802]
- Fonds voor Wetenschappelijk Onderzoek [506G.0656.05]
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Background: Anaerobic oxidation of methane coupled to sulphate reduction (SR-AOM) prevents more than 90% of the oceanic methane emission to the atmosphere. In a previous study, we demonstrated that the high methane pressure (1, 4.5, and 8 MPa) stimulated in vitro SR-AOM activity. However, the information on the effect of high-pressure on the microbial community structure and architecture was still lacking. Results: In this study we analysed the long-term enrichment (286 days) of this microbial community, which was mediating SR-AOM in a continuous high-pressure bioreactor. 99.7% of the total biovolume represented cells in the form of small aggregates (diameter less then 15 mu m). An increase of the total biovolume was observed (2.5 times). After 286 days, the ANME-2 (anaerobic methanotrophic archaea subgroup 2) and SRB (sulphate reducing bacteria) increased with a factor 12.5 and 8.4, respectively. Conclusion: This paper reports a net biomass growth of communities involved in SR-AOM, incubated at high-pressure.
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