Regulation of photosynthesis and oxygen consumption in a hypersaline cyanobacterial mat (Camargue, France) by irradiance, temperature and salinity

Wieland, A; Kühl, M

Regulation of photosynthesis and oxygen consumption in a hypersaline cyanobacterial mat (Camargue, France) by irradiance, temperature and salinity

Wieland, A Kühl, M

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Publication Type:: Journal Article
Citation:: FEMS Microbiology Ecology, 2006, 55 (2), pp. 195 - 210
Issue Date:: 2006-02-01

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Field	Value	Language
dc.contributor.author	Wieland, A	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.date.issued	2006-02-01	en_US
dc.identifier.citation	FEMS Microbiology Ecology, 2006, 55 (2), pp. 195 - 210	en_US
dc.identifier.issn	0168-6496	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13237
dc.description.abstract	Short-term effects of irradiance (0-1560 μmol photons m-2 s-1), temperature (10-25°C), and salinity (40-160) on oxygenic photosynthesis and oxygen consumption in a hypersaline mat (Salin-de-Giraud, France) were investigated with microsensors under controlled laboratory conditions. Dark O2 consumption rates were mainly regulated by the mass transfer limitations imposed by the diffusive boundary layer. Areal rates of net photosynthesis increased with irradiance and saturated at irradiances >400 μmol photons m-2 s-1. At low irradiances, oxygen consumption increased more strongly with temperature than photosynthesis, whereas the opposite was observed at saturating irradiances. Net photosynthesis vs. irradiance curves were almost unaffected by decreasing salinity (100 to 40), whereas increasing salinities (100 to 160) led to a decrease of net photosynthesis at each irradiance. Dark O2 consumption rates, maximal gross and net photosynthesis at light saturation were relatively constant over a broad salinity range (60-100) and decreased at salinities above the in situ salinity of 100. Within the range of natural variation, temperature was more important than salinity in regulating photosynthesis and oxygen consumption. At higher salinities the inhibitory impact of salinity on these processes and therefore the importance of salinity as a regulating environmental parameter increased, indicating that in more hypersaline systems, salinity has a stronger limiting effect on microbial activity. © 2005 Federation of European Microbiological Societies Published by Blackwell Publishing Ltd. All rights reserved.	en_US
dc.relation.ispartof	FEMS Microbiology Ecology	en_US
dc.relation.isbasedon	10.1111/j.1574-6941.2005.00031.x	en_US
dc.subject.classification	Microbiology	en_US
dc.subject.mesh	Cyanobacteria	en_US
dc.subject.mesh	Sodium Chloride	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Adaptation, Physiological	en_US
dc.subject.mesh	Photosynthesis	en_US
dc.subject.mesh	Oxygen Consumption	en_US
dc.subject.mesh	Light	en_US
dc.subject.mesh	Darkness	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.title	Regulation of photosynthesis and oxygen consumption in a hypersaline cyanobacterial mat (Camargue, France) by irradiance, temperature and salinity	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	55	en_US
utslib.for	0605 Microbiology	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	11 Medical and Health Sciences	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	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	55	en_US

Abstract:

Short-term effects of irradiance (0-1560 μmol photons m-2 s-1), temperature (10-25°C), and salinity (40-160) on oxygenic photosynthesis and oxygen consumption in a hypersaline mat (Salin-de-Giraud, France) were investigated with microsensors under controlled laboratory conditions. Dark O2 consumption rates were mainly regulated by the mass transfer limitations imposed by the diffusive boundary layer. Areal rates of net photosynthesis increased with irradiance and saturated at irradiances >400 μmol photons m-2 s-1. At low irradiances, oxygen consumption increased more strongly with temperature than photosynthesis, whereas the opposite was observed at saturating irradiances. Net photosynthesis vs. irradiance curves were almost unaffected by decreasing salinity (100 to 40), whereas increasing salinities (100 to 160) led to a decrease of net photosynthesis at each irradiance. Dark O2 consumption rates, maximal gross and net photosynthesis at light saturation were relatively constant over a broad salinity range (60-100) and decreased at salinities above the in situ salinity of 100. Within the range of natural variation, temperature was more important than salinity in regulating photosynthesis and oxygen consumption. At higher salinities the inhibitory impact of salinity on these processes and therefore the importance of salinity as a regulating environmental parameter increased, indicating that in more hypersaline systems, salinity has a stronger limiting effect on microbial activity. © 2005 Federation of European Microbiological Societies Published by Blackwell Publishing Ltd. All rights reserved.

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http://hdl.handle.net/10453/13237