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  Lipid biomarkers as indicators for environmental stress in cyanobacterial mats of Abu Dhabi, United Arab Emirates

Scherf, A. K., Abed, R. M. M., & Rullkötter, J. (2007). Lipid biomarkers as indicators for environmental stress in cyanobacterial mats of Abu Dhabi, United Arab Emirates. Geochimica et Cosmochimica Acta, 71(15 Suppl. Suppl. S), A888-A888.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-CE22-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-A4F6-A
Genre: Journal Article

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Scherf, A. K., Author
Abed, R. M. M.1, Author              
Rullkötter, J.2, Author              
Affiliations:
1Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              
2Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              

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 Abstract: Variations in morphology, fatty acids, pigments and cyanobacterial community composition were studied in microbial mats across intertidal flats of the arid Arabian Gulf coast. These mats experience combined extreme conditions of salinity, temperature, UV radiation and desiccation depending on their tidal position. Different mat forms were observed depending on the topology of the coast and location. The mats contained 63 fatty acids in different proportions. The increased amounts of unsaturated fatty acids (12-39%) and the trans/cis ratio (0.6-1.6%) of the cyanobacterial fatty acid n-18:1omega9 in the higher tidal mats suggested an adaptation of the mat microorganisms to environmental stress. Chlorophyll a concentrations suggested lower cyanobacterial abundance in the higher than in the lower intertidal mats. Scytonemin concentrations were dependent on the increase in solar irradiation, salinity and desiccation. The mats showed richness in cyanobacterial species, with Microcoleus chthonoplastes and Lyngbya aestuarii morphotypes as the dominant cyanobacteria. Denaturing gradient gel electrophoresis patterns suggested shifts in the cyanobacterial community dependent on drainage efficiency and salinity from lower to higher tidal zones. We conclude that the topology of the coast and the variable extreme environmental conditions across the tidal flat determine the distribution of microbial mats as well as the presence or absence of different microorganisms.

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Language(s): eng - English
 Dates: 2007-08
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 344358
ISI: 000248789902148
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Title: Geochimica et Cosmochimica Acta
  Alternative Title : Geochim. Cosmochim. Acta
Source Genre: Journal
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Pages: - Volume / Issue: 71 (15 Suppl. Suppl. S) Sequence Number: - Start / End Page: A888 - A888 Identifier: ISSN: 0016-7037