title: Influence of microorganisms on the removal of nickel in tropical marine sediments (New Caledonia).
abstract: The removal of nickel in marine tropical sediments (New Caledonia) was studied in microcosms. Removal of Ni(2+) was strongly enhanced by the presence of bacteria, with rates up to twofold higher than those observed under sterilized conditions. After 8 days of incubation, Ni(2+) concentration in the water column ranged from 30% to 50% of the initial concentration according to sediment origin. Addition of glucose stimulated bacterial processes and resulted in a complete disappearance of Ni(2+) in the water phase. Incubation under anoxic conditions slightly affects the microbial structure inferred from T-RFLP analysis irrespective of Ni(2+) spiking, whereas incubation under oxic conditions resulted to moderate modification of the microbial structure, changes that might be more marked in the presence of Ni(2+). Five different T-RFs were observed in almost all microcosms with relative abundance between 5% and 30%. Incubation with glucose resulted in the dominance of a common T-RF, with relative abundance up to 39%.
authors.affiliation: Unité de Recherche 103, Centre IRD de Nouméa, Promenade Roger Laroque, BP A5 98848 Nouméa Cedex, Nouvelle Calédonie, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Pringault
authors.forename: Héléna
authors.initials: H
authors.lastname: Viret
authors.forename: Robert
authors.initials: R
authors.lastname: Duran
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D018407:Bacterial Physiological Phenomena / Q000187:drug effects*; D001673:Biodegradation, Environmental / Q000187:drug effects; D044822:Biodiversity; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology*; D005947:Glucose / Q000494:pharmacology; D009510:New Caledonia; D009532:Nickel / Q000378:metabolism* / Q000494:pharmacology*; D012623:Seawater / Q000737:chemistry; D014329:Tropical Climate; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000494:pharmacology
chemical_list: D014874:Water Pollutants, Chemical; D009532:Nickel; D005947:Glucose