Aubé J. auteur aut IRD Senin P. auteur aut IRD Pringault Olivier auteur aut IRD Bonin P. auteur aut IRD Deflandre B. auteur aut IRD Bouchez O. auteur aut IRD Bru N. auteur aut IRD Biritxinaga-Etchart E. auteur aut IRD Klopp C. auteur aut IRD Guyoneaud R. auteur aut IRD Goni-Urriza M. auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Biogeochemical functioning Diversity Hydrocarbonoclastic bacteria Microbial mats FRANCE MEDITERRANNEE BERRE ETANG 036 084 038 111 1-2 115-125 2016 0025-326X https://www.documentation.ird.fr/hor/fdi:010068229 10.1016/j.marpolbul.2016.07.023 0025-326X [F B010068229] https://www.documentation.ird.fr/hor/fdi:010068229 https://www.documentation.ird.fr/intranet/publi/2016/11/010068229.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-12-06 2017-08-23 fdi:010068229 fre