NDLI: Identities of Epilithic Hydrocarbon-Utilizing Diazotrophic Bacteria from the Arabian Gulf Coasts, and Their Potential for Oil Bioremediation Without Nitrogen Supplementation

Content Provider	Springer Nature Link
Author	Radwan, Samir Mahmoud, Huda Khanafer, Majida Al Habib, Aamar Al Hasan, Redha
Copyright Year	2010
Abstract	Gravel particles from four sites along the Arabian Gulf coast in autumn, winter, and spring were naturally colonized with microbial consortia containing between 7 and 400 × 102 cm−2 of cultivable oil-utilizing bacteria. The 16S rRNA gene sequences of 70 representatives of oil-utilizing bacteria revealed that they were predominantly affiliated with the Gammaproteobacteria and the Actinobacteria. The Gammaproteobacteria comprised among others, the genera Pseudomonas, Pseudoalteromonas, Shewanella, Marinobacter, Psychrobacter, Idiomarina, Alcanivorax, Cobetia, and others. Actinobacteria comprised the genera Dietzia, Kocuria, Isoptericola, Rhodococcus, Microbacterium, and others. In autumn, Firmicutes members were isolated from bay and nonbay stations while Alphaproteobacteria were detected only during winter from Anjefa bay station. Fingerprinting by denaturing gradient gel electrophoresis of amplified 16S rRNA genes of whole microbial consortia confirmed the culture-based bacterial diversities in the various epilithons in various sites and seasons. Most of the representative oil-utilizing bacteria isolated from the epilithons were diazotrophic and could attenuate oil also in nitrogen-rich (7.9–62%) and nitrogen-free (4–54%) cultures, which, makes the microbial consortia suitable for oil bioremediation in situ, without need for nitrogen supplementation. This was confirmed in bench-scale experiments in which unfertilized oily seawater was bioremediated by epilithon-coated gravel particles.
Starting Page	354
Ending Page	363
Page Count	10
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	60
Issue Number	2
e-ISSN	1432184X
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-22
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Nature Conservation Geoecology/Natural Processes Microbial Ecology Ecology Microbiology
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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