Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species
11 pages, 2 tables, 4 figures.
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2008-08-31
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| Subjects: | Crude-oil pollution, Biodegradation, Marine environment, Cyanobacteria, Confocal Laser Scanning Microscopy, Microbial mats, Microcosms, |
| Online Access: | http://hdl.handle.net/10261/11953 |
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dig-idaea-es-10261-119532020-07-03T12:19:44Z Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species Llirós, Marc Gaju, Nuria Grimalt, Joan O. Esteve, Isabel Martínez-Alonso, Maira Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms 11 pages, 2 tables, 4 figures. The influence of microbial mats on the degradation of two crude oils (Casablanca and Maya) and the effect of oil pollution on the mat structure were assessed using model ecosystems, prepared under laboratory conditions subject to tidal movements, from pristine Ebro Delta microbial-mat ecosystems. Both selected oils are examples of those currently used for commercial purposes. Casablanca crude oil is aliphatic with a low viscosity; Maya represents a sulphur-rich heavy crude oil that is predominantly aromatic. In the unpolluted microcosms, Microcoleus chthonoplastes-, Phormidium- and Oscillatoria-like were the dominant filamentous cyanobacterial morphotypes, whilst Synechoccocus-, Synechocystis- and Gloeocapsa-like were the most abundant unicellular cyanobacteria. After oil contamination, no significant changes of chlorophyll a and protein concentrations were observed, though cyanobacterial diversity shifts were monitored. Among filamentous cyanobacteria, M. chthonoplastes-like morphotype was the most resistant for both oils, unlike the other cyanobacteria, which tolerated Casablanca but not Maya. Unicellular cyanobacteria seemed to be resistant to pollution with both essayed oils, with the exception of the morphotype resembling Gloeocapsa, which was sensitive to both oils. The crude-oil addition also had a significant effect on certain components of the heterotrophic microbial community. Casablanca oil induced an increase in anaerobic heterotrophic bacteria, whereas the opposite effect was observed in those heterotrophs when polluted with Maya oil. The overall results, microbiological and crude-oil transformation analysis, indicate that the indigenous community has a considerable potential to degrade oil components by means of the metabolic cooperation of phototrophic and heterotrophic population We would like to thank the Salines de la Trinitat and Parc Natural del Delta de l’Ebre (Generalitat de Catalunya) for permission to access the sampling site, and REPSOL-YPF for providing samples of Casablanca and Maya crude oils. We also thank members of the Servei de Microscòpia at the Autonomous University of Barcelona (UAB) for support with CLSM. We are grateful to Lidia Hernandez and Carol Egea for technical assistance with the microcosms and sample processing. This research was funded by the European Union MATBIOPOL project EVK3-CT-1999-00010. Peer reviewed 2009-03-31T07:47:54Z 2009-03-31T07:47:54Z 2008-08-31 artículo http://purl.org/coar/resource_type/c_6501 Science of the Total Environment 393(1): 39-49 (2008) 0048-9697 http://hdl.handle.net/10261/11953 10.1016/j.scitotenv.2007.11.034 en http://dx.doi.org/10.1016/j.scitotenv.2007.11.034 none 19968 bytes application/msword Elsevier |
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English |
| topic |
Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms |
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Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms Llirós, Marc Gaju, Nuria Grimalt, Joan O. Esteve, Isabel Martínez-Alonso, Maira Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| description |
11 pages, 2 tables, 4 figures. |
| format |
artículo |
| topic_facet |
Crude-oil pollution Biodegradation Marine environment Cyanobacteria Confocal Laser Scanning Microscopy Microbial mats Microcosms |
| author |
Llirós, Marc Gaju, Nuria Grimalt, Joan O. Esteve, Isabel Martínez-Alonso, Maira |
| author_facet |
Llirós, Marc Gaju, Nuria Grimalt, Joan O. Esteve, Isabel Martínez-Alonso, Maira |
| author_sort |
Llirós, Marc |
| title |
Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| title_short |
Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| title_full |
Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| title_fullStr |
Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| title_full_unstemmed |
Microcosm experiments of oil degradation by microbial mats. II. The changes in microbial species |
| title_sort |
microcosm experiments of oil degradation by microbial mats. ii. the changes in microbial species |
| publisher |
Elsevier |
| publishDate |
2008-08-31 |
| url |
http://hdl.handle.net/10261/11953 |
| work_keys_str_mv |
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| _version_ |
1777669146839875584 |