AUBE, Johanne; SENIN, Pavel; PRINGAULT, Olivier; BONIN, Patricia; DEFLANDRE, Bruno; BOUCHEZ, Olivier; BRU, Noëlle; BIRITXINAGA-ETCHART, Edurne; KLOPP, Christophe; GUYONEAUD, Remy; GOÑI, Marisol

doi:10.1016/j.marpolbul.2016.07.023

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AUBE, Johanne
Université de Brest [UBO]

SENIN, Pavel
Los Alamos National Laboratory [LANL]

PRINGAULT, Olivier
Ecologie des systèmes marins côtiers [Ecosym]

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Article de revue

Ce document a été publié dans

Marine Pollution Bulletin. 2016-10, vol. 111, n° 1-2, p. 115-125

Elsevier

Résumé en anglais

Photosynthetic microbial mats are metabolically structured systems driven by solar light. They are ubiquitous and can grow in hydrocarbon-polluted sites. Our aim is to determine the impact of chronic hydrocarbon contamination on the structure, activity, and functioning of a microbial mat. We compared it to an uncontaminated mat harboring similar geochemical characteristics. The mats were sampled in spring and fall for 2 years. Seasonal variations were observed for the reference mat: sulfur cycle-related bacteria dominated spring samples, while Cyanobacteria dominated in autumn. The contaminated mat showed minor seasonal variation; a progressive increase of Cyanobacteria was noticed, indicating a perturbation of the classical seasonal behavior. Hydrocarbon content was the main factor explaining the differences in the microbial community structure; however, hydrocarbonoclastic bacteria were among rare or transient Operational Taxonomic Units (OTUs) in the contaminated mat. We suggest that in long-term contaminated systems, hydrocarbonoclastic bacteria cannot be considered a sentinel of contamination< Réduire

Mots clés

Microbial mats

Mots clés en anglais

Biogeochemical functioning

Diversity

Hydrocarbonoclastic bacteria