| Light utilization efficiency in photosynthetic microbial mats. | |
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MedLine Citation:
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PMID: 22176769 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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Mohammad A A Al-Najjar; Dirk de Beer; Michael Kühl; Lubos Polerecky |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-19 |
Journal Detail:
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Title: Environmental microbiology Volume: - ISSN: 1462-2920 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100883692 Medline TA: Environ Microbiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2011 Society for Applied Microbiology and Blackwell Publishing Ltd. |
Affiliation:
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Max-Planck Institute for Marine Microbiology, Celsiusstr.1, 28359 Bremen, Germany Marine Biological Section, Department of Biology, University of Copenhagen, Copenhagen, Denmark Plant Functional Biology and Climate Change Cluster, Department of Environmental Sciences, University of Technology Sydney, Sydney, New South Wales, Australia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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