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Auteur (up) Bonilla-Findji, O.; Rochelle-Newall, E.; Weinbauer, M.G.; Pizay, M.D.; Kerros, M.E.; Gattuso, J.P. url  doi
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  Titre Effect of seawater-freshwater cross-transplantations on viral dynamics and bacterial diversity and production Type Article scientifique
  Année 2009 Publication Revue Abrégée Aquat. Microb. Ecol.  
  Volume 54 Numéro 1 Pages 1-11  
  Mots-Clés aquatic systems; Bacterial production; Bacterial richness; bacterioplankton; batch cultures; chesapeake bay; Communities; community composition; dissolved organic-matter; estuarine salinity gradient; growth efficiency; marine; microbial; population-dynamics; Transplantation; Virus  
  Résumé Dilution experiments were carried out to investigate the community composition and the metabolic response of seawater and freshwater bacteria to cross-transplantation, and the effects of nor.-indigenous bacterial hosts on viral dynamics. Changes in viral and bacterial abundance and production, as Well as bacterial respiration, carbon demand and diversity were regularly monitored over a 6 d period. Bacterial production in the transplanted seawater (SB-t) and freshwater (FB-t) bacteria treatments was stimulated up to 256 and 221 %, respectively, compared to controls. The stimulation of bacterial production and carbon demand was accompanied by a decrease in bacterial richness. Net viral production was stimulated by 81% in SB-t and repressed by 75% in FB-t. Transplantation increased the virus-induced mortality of marine bacteria, but decreased it for freshwater bacteria. These results suggest that (1) marine bacteria can readily oxidize freshwater dissolved organic matter, and (2) freshwater viruses might be able to infect marine hosts, thus highlighting their potential role in fueling bacterial growth under resource stress or nutrient-depleted conditions.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0948-3055 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 546  
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Auteur (up) Pringault, O.; Lafabrie, C.; Avezac, M.; Bancon-Montigny, C.; Carré, C.; Chalghaf, M.; Delpoux, S.; Duvivier, A.; Elbaz-Poulichet, F.; Gonzalez, C.; Got, P.; Leboulanger, C.; Spinelli, S.; Hlaili, A.S.; Bouvy, M. doi  openurl
  Titre Consequences of contaminant mixture on the dynamics and functional diversity of bacterioplankton in a southwestern Mediterranean coastal ecosystem Type Article scientifique
  Année 2016 Publication Revue Abrégée Chemosphere  
  Volume 144 Numéro Pages 1060-1073  
  Mots-Clés aquatic systems; Bacterial growth efficiency; Bacterial production; bizerte lagoon; Community level physiological profiles; growth efficiency; Herbicides; heterotrophic bacteria; Metals; microbial communities; Microcosms; organic-carbon; polycyclic aromatic-hydrocarbons; sediment resuspension; substrate utilization pattern; surface sediments  
  Résumé 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. (C) 2015 Elsevier Ltd. All rights reserved.  
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  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0045-6535 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1507  
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