Pringault Olivier auteur aut IRD Lafabrie Céline auteur aut IRD Avezac M. auteur aut IRD Bancon-Montigny C. auteur aut IRD Carré Claire auteur aut IRD Chalghaf M. auteur aut IRD Delpoux S. auteur aut IRD Duvivier A. auteur aut IRD Elbaz-Poulichet F. auteur aut IRD Gonzalez C. auteur aut IRD Got P. auteur aut IRD Leboulanger Christophe auteur aut IRD Spinelli S. auteur aut IRD Hlaili A. S. auteur aut IRD Bouvy Marc auteur aut IRD text journalArticle eng text/pdf born digital access Contamination of coastal environments is often due to a complex mixture of pollutants, sometimes in trace levels, that may have significant effects on diversity and function of organisms. The aim of this study was to evaluate the short-term dynamics of bacterioplankton exposed to natural and artificial mixtures of contaminants. Bacterial communities from a southwestern Mediterranean ecosystem, lagoon and the bay (offshore) of Bizerte were exposed to i) elutriate from resuspension of contaminated sediment, and ii) an artificial mixture of metals and herbicides mimicking the contamination observed during sediment resuspension. Elutriate incubation as well as artificial spiking induced strong enrichments in nutrients (up to 18 times), metals (up to six times) and herbicides (up to 20 times) relative to the in situ concentrations in the offshore station, whereas the increases in contaminants were less marked in the lagoon station. In the offshore waters, the artificial mixture of pollutants provoked a strong inhibition of bacterial abundance, production and respiration and significant modifications of the potential functional diversity of bacterioplankton with a strong decrease of the carbohydrate utilization. In contrast, incubation with elutriate resulted in a stimulation of bacterial activities and abundances, suggesting that the toxic effects of pollutants were modified by the increase in nutrient and DOM concentrations due to the sediment resuspension. The effects of elutriate and the artificial mixture of pollutants on bacterial dynamics and the functional diversity were less marked in the lagoon waters, than in offshore waters, suggesting a relative tolerance of lagoon bacteria against contaminants. specialized Metals Herbicides Community level physiological profiles Bacterial production Bacterial growth efficiency Microcosms MEDITERRANEE TUNISIE BIZERTE 036 038 144 1060-1073 2016 0045-6535 https://www.documentation.ird.fr/hor/fdi:010066097 10.1016/j.chemosphere.2015.09.093 0045-6535 [F B010066097] https://www.documentation.ird.fr/hor/fdi:010066097 https://www.documentation.ird.fr/intranet/publi/2016/02/010066097.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-02-26 2017-08-23 fdi:010066097 fre