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Updated: Jul 11, 2026

Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
Published on: November 5, 2014
Microbial community structure in three deep-sea carbonate crusts.
S K Heijs1, G Aloisi, I Bouloubassi
1Department of Microbiology, Center of Ecological and Evolutionary Studies, University of Groningen, P.O. Box 14, 9750 AA, Haren, The Netherlands. sander@house-of-media.nl
Marine carbonate crusts sequester carbon dioxide. Microbial communities in Mediterranean mud volcano crusts reveal diverse bacteria and archaea, some potentially involved in carbonate formation and methane cycling.
Area of Science:
- Marine geology
- Microbial ecology
- Biogeochemistry
Background:
- Marine carbonate crusts are significant carbon sinks.
- Understanding their formation is crucial for climate change research.
- Deep-sea mud volcanoes host unique microbial ecosystems.
Purpose of the Study:
- Characterize microbial communities in Mediterranean carbonate crusts.
- Investigate the role of prokaryotes in carbonate formation.
- Explore potential links to methane cycling.
Main Methods:
- 16S ribosomal RNA (rRNA) gene sequencing of directly retrieved DNA.
- Analysis of mineralogical composition.
- Lipid analyses.
Main Results:
- Highly diverse and distinct microbial communities found in each crust.
- Abundant bacterial sequences classified as alpha-, gamma-, and delta- Proteobacteria.
- Presence of Proteobacteria linked to carbonate mineral formation (Halomonas, Halovibrio).
- Archaeal sequences suggest potential involvement in anaerobic oxidation of methane (AOM), with novel diversity.
- Negative delta 13C values in archaeal lipids support novel metabolic roles.
Conclusions:
- Microbial communities in carbonate crusts are diverse and unique.
- Specific bacteria play a role in carbonate mineral formation.
- Archaeal diversity in AOM may be underestimated.
- Distinct microbial communities can perform similar biogeochemical processes in crust formation.
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