Pringault Olivier, Lafabrie Céline, Avezac M., Bancon-Montigny C., Carré Claire, Chalghaf M., Delpoux S., Duvivier A., Elbaz-Poulichet F., Gonzalez C., Got P., Leboulanger Christophe, Spinelli S., Hlaili A. S., Bouvy Marc. (2016). Consequences of contaminant mixture on the dynamics and functional diversity of bacterioplankton in a southwestern Mediterranean coastal ecosystem. Chemosphere, 144, p. 1060-1073. ISSN 0045-6535.
Titre du document
Consequences of contaminant mixture on the dynamics and functional diversity of bacterioplankton in a southwestern Mediterranean coastal ecosystem
Année de publication
2016
Auteurs
Pringault Olivier, Lafabrie Céline, Avezac M., Bancon-Montigny C., Carré Claire, Chalghaf M., Delpoux S., Duvivier A., Elbaz-Poulichet F., Gonzalez C., Got P., Leboulanger Christophe, Spinelli S., Hlaili A. S., Bouvy Marc
Source
Chemosphere, 2016,
144, p. 1060-1073 ISSN 0045-6535
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.
Plan de classement
Ecologie, systèmes aquatiques [036]
;
Pollution [038]
Description Géographique
MEDITERRANEE ; TUNISIE ; BIZERTE
Localisation
Fonds IRD [F B010066097]
Identifiant IRD
fdi:010066097
