Biogeochemistry of an iron-rich hypersaline microbial mat (Camargue, France)

Wieland, A; Zopfi, J; Benthien, M; Kühl, M

Biogeochemistry of an iron-rich hypersaline microbial mat (Camargue, France)

Wieland, A Zopfi, J Benthien, M Kühl, M

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Publication Type:: Journal Article
Citation:: Microbial Ecology, 2005, 49 (1), pp. 34 - 49
Issue Date:: 2005-01-01

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Field	Value	Language
dc.contributor.author	Wieland, A	en_US
dc.contributor.author	Zopfi, J	en_US
dc.contributor.author	Benthien, M	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.date.available	2003-10-30	en_US
dc.date.issued	2005-01-01	en_US
dc.identifier.citation	Microbial Ecology, 2005, 49 (1), pp. 34 - 49	en_US
dc.identifier.issn	0095-3628	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14902
dc.description.abstract	In situ microsensor measurements were combined with biogeochemical methods to determine oxygen, sulfur, and carbon cycling in microbial mats growing in a solar saltern (Salin-de-Giraud, France). Sulfate reduction rates closely followed the daily temperature changes and were highest during the day at 25°C and lowest during the night at 11°C, most probably fueled by direct substrate interactions between cyanobacteria and sulfate-reducing bacteria. Sulfate reduction was the major mineralization process during the night and the contribution of aerobic respiration to nighttime DIC production decreased. This decrease of aerobic respiration led to an increasing contribution of sulfide (and iron) oxidation to nighttime O2 consumption. A peak of elemental sulfur in a layer of high sulfate reduction at low sulfide concentration underneath the oxic zone indicated anoxygenic photosynthesis and/or sulfide oxidation by iron, which strongly contributed to sulfide consumption. We found a significant internal carbon cycling in the mat, and sulfate reduction directly supplied DIC for photosynthesis. The mats were characterized by a high iron content of 56 μmol Fe cm-3, and iron cycling strongly controlled the sulfur cycle in the mat. This included sulfide precipitation resulting in high FeS contents with depth, and reactions of iron oxides with sulfide, especially after sunset, leading to a pronounced gap between oxygen and sulfide gradients and an unusual persistence of a pH peak in the uppermost mat layer until midnight. © Springer Science+Business Media, Inc. 2004.	en_US
dc.relation.ispartof	Microbial Ecology	en_US
dc.relation.isbasedon	10.1007/s00248-003-2033-4	en_US
dc.subject.classification	Microbiology	en_US
dc.subject.mesh	Cyanobacteria	en_US
dc.subject.mesh	Carbon	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Sulfur	en_US
dc.subject.mesh	Iron	en_US
dc.subject.mesh	Biochemistry	en_US
dc.subject.mesh	Temperature	en_US
dc.subject.mesh	Seawater	en_US
dc.subject.mesh	Photosynthesis	en_US
dc.subject.mesh	Biochemical Phenomena	en_US
dc.subject.mesh	Oxidation-Reduction	en_US
dc.subject.mesh	Hydrogen-Ion Concentration	en_US
dc.subject.mesh	Geology	en_US
dc.subject.mesh	France	en_US
dc.subject.mesh	Geological Phenomena	en_US
dc.title	Biogeochemistry of an iron-rich hypersaline microbial mat (Camargue, France)	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	49	en_US
utslib.for	0605 Microbiology	en_US
utslib.for	0503 Soil Sciences	en_US
utslib.for	0602 Ecology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	49	en_US

Abstract:

In situ microsensor measurements were combined with biogeochemical methods to determine oxygen, sulfur, and carbon cycling in microbial mats growing in a solar saltern (Salin-de-Giraud, France). Sulfate reduction rates closely followed the daily temperature changes and were highest during the day at 25°C and lowest during the night at 11°C, most probably fueled by direct substrate interactions between cyanobacteria and sulfate-reducing bacteria. Sulfate reduction was the major mineralization process during the night and the contribution of aerobic respiration to nighttime DIC production decreased. This decrease of aerobic respiration led to an increasing contribution of sulfide (and iron) oxidation to nighttime O2 consumption. A peak of elemental sulfur in a layer of high sulfate reduction at low sulfide concentration underneath the oxic zone indicated anoxygenic photosynthesis and/or sulfide oxidation by iron, which strongly contributed to sulfide consumption. We found a significant internal carbon cycling in the mat, and sulfate reduction directly supplied DIC for photosynthesis. The mats were characterized by a high iron content of 56 μmol Fe cm-3, and iron cycling strongly controlled the sulfur cycle in the mat. This included sulfide precipitation resulting in high FeS contents with depth, and reactions of iron oxides with sulfide, especially after sunset, leading to a pronounced gap between oxygen and sulfide gradients and an unusual persistence of a pH peak in the uppermost mat layer until midnight. © Springer Science+Business Media, Inc. 2004.

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http://hdl.handle.net/10453/14902