Diurnal and seasonal variations of nitrogen fixation and photosynthesis in cyanobacterial mats |
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Authors: | M Villbrandt W E Krumbein L J Stal |
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Institution: | (1) Geomicrobiology Division/ICBM, University of Oldenburg, P.O. Box 2503, DW-2900 Oldenburg, Germany;(2) Laboratory for Microbiology, University of Amsterdam, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands |
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Abstract: | In situ measurements of nitrogenase activity and photosynthesis were performed simultaneously in cyanobacterial mats of intertidal sand flats of the Southern North Sea. Two types of cyanobacterial mats, which differed in species composition and biomass content, were investigated. The measurements were done monthly during 3 years to detect seasonal variations of nitrogen fixation and photosynthesis. Diurnal variations were investigated as well. The results showed that (i) freshly colonized sediment with the cyanobacteriumOscillatoria limosa as the dominant organism revealed the highest specific nitrogenase activities (ii) nitrogenase activities were highest in spring and summer, when mat development was initiated and (iii) diurnal fluctuations of nitrogenase activity indicated that it occurred temporally separated from oxygenic photosynthesis. |
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Keywords: | cyanobacteria microbial mats nitrogen fixation Oscillatoria limosa |
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