Influence of microorganisms on the removal of nickel in tropical marine sediments (New Caledonia).
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%.
Pringault
Olivier
O
Unité de Recherche 103, Centre IRD de Nouméa, Promenade Roger Laroque, BP A5 98848 Nouméa Cedex, Nouvelle Calédonie, France.
Viret
Héléna
H
Duran
Robert
R
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
D014874:Water Pollutants, Chemical; D009532:Nickel; D005947:Glucose