Light utilization efficiency in photosynthetic microbial mats

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Show simple item record Al-Najjar, Mohammad en_US De Beer, Dirk en_US Kuhl, Michael en_US Polerecky, Lubos en_US
dc.contributor.editor en_US 2012-10-12T03:33:32Z 2012-10-12T03:33:32Z 2012 en_US
dc.identifier 2011003801 en_US
dc.identifier.citation Al-Najjar Mohammad et al. 2012, 'Light utilization efficiency in photosynthetic microbial mats', Wiley-Blackwell Publishing Ltd., vol. 14, no. 4, pp. 982-992. en_US
dc.identifier.issn 1462-2912 en_US
dc.identifier.other C1 en_US
dc.description.abstract Based on combined microsensor measurements of irradiance, temperature and O2, 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. en_US
dc.language en_US
dc.publisher Wiley-Blackwell Publishing Ltd. en_US
dc.relation.isbasedon en_US
dc.title Light utilization efficiency in photosynthetic microbial mats en_US
dc.parent Environmental Microbiology en_US
dc.journal.volume 14 en_US
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 060500 en_US
dc.personcode 0000061183 en_US
dc.personcode 0000061184 en_US
dc.personcode 107129 en_US
dc.personcode 0000061186 en_US
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
dc.staffid en_US

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