Light utilization efficiency in photosynthetic microbial mats

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Show simple item record Al-Najjar, MAA de Beer, D Kühl, M Polerecky, L 2012-10-12T03:33:32Z 2012-04
dc.identifier.citation Environmental Microbiology, 2012, 14 (4), pp. 982 - 992
dc.identifier.issn 1462-2912
dc.identifier.other C1 en_US
dc.description.abstract Based on combined microsensor measurements of irradiance, temperature and O 2, we compared light energy budgets in photosynthetic microbial mats, with a special focus on the efficiency of light energy conservation by photosynthesis. The euphotic zones in the three studied mats differed in their phototrophic community structure, pigment concentrations and thickness. In all mats, <1% of the absorbed light energy was conserved via photosynthesis at high incident irradiance, while the rest was dissipated as heat. Under light-limiting conditions, the photosynthetic efficiency reached a maximum, which varied among the studied mats between 4.5% and 16.2% and was significantly lower than the theoretical maximum of 27.7%. The maximum efficiency correlated linearly with the light attenuation coefficient and photopigment concentration in the euphotic zone. Higher photosynthetic efficiency was found in mats with a thinner and more densely populated euphotic zone. Microbial mats exhibit a lower photosynthetic efficiency compared with ecosystems with a more open canopy-like organization of photosynthetic elements, where light propagation is not hindered to the same extent by photosynthetically inactive components; such components contributed about 40-80% to light absorption in the investigated microbial mats, which is in a similar range as in oceanic planktonic systems. © 2011 Society for Applied Microbiology and Blackwell Publishing Ltd.
dc.language eng
dc.relation.isbasedon 10.1111/j.1462-2920.2011.02676.x
dc.title Light utilization efficiency in photosynthetic microbial mats
dc.type Journal Article
dc.description.version Published
dc.parent Environmental Microbiology
dc.journal.volume 4
dc.journal.volume 14
dc.journal.number 4 en_US
dc.publocation United Kingdom en_US
dc.identifier.startpage 982 en_US
dc.identifier.endpage 992 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0605 Microbiology
dc.personcode 107129
dc.percentage 100 en_US Microbiology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
pubs.embargo.period Not known
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
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Uncategorised (ID: 363)
utslib.collection.history Closed (ID: 3)

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