Magnetotactic Bacteria in Microcosms Originating from the French Mediterranean Coast Subjected to Oil Industry Activities - Archive ouverte HAL Access content directly
Journal Articles Microbial ecology Year : 2012

Magnetotactic Bacteria in Microcosms Originating from the French Mediterranean Coast Subjected to Oil Industry Activities

Anne Postec
Nicolas Tapia
  • Function : Author
Alain Bernadac
  • Function : Author
Manon Bartoli
Long-Fei Wu
Nathalie Pradel

Abstract

Magnetotactic bacteria (MTB) mineralize nanosized magnetite or greigite crystals within cells and thus play an important role in the biogeochemical process. Despite decades of research, knowledge of MTB distribution and ecology, notably in areas subjected to oil industry activities, is still limited. In the present study, we investigated the presence of MTB in the Gulf of Fos, French Mediterranean coast, which is subjected to intensive oil industry activities. Microcosms containing sediments/water (1:2, v/v) from several sampling sites were monitored over several weeks. The presence of MTB was revealed in five of eight sites. Diverse and numerous MTB were revealed particularly from one site (named CAR), whilst temporal variations of a homogenous magnetotactic cocci population was shown within the LAV site microcosm over a 4-month period. Phylogenetic analysis revealed that they belonged to Alphaproteobacteria, and a novel genus from the LAV site was evidenced. Among the physicochemical parameters measured, a correlation was shown between the variation of MTB abundance in microcosms and the redox state of sulphur compounds.

Dates and versions

hal-00687453 , version 1 (13-04-2012)

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Anne Postec, Nicolas Tapia, Alain Bernadac, Manon Bartoli, Sylvain Davidson, et al.. Magnetotactic Bacteria in Microcosms Originating from the French Mediterranean Coast Subjected to Oil Industry Activities. Microbial ecology, 2012, 63, pp.1-11. ⟨10.1007/s00248-011-9910-z⟩. ⟨hal-00687453⟩
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