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• W2071478415 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 21:125-137 (2000) - doi:10.3354/ame021125 Nutrient stimulation of bacterioplankton growth in Tuamotu atoll lagoons J.-P. Torréton1,*, V. Talbot1, N. Garcia2 1Institut de Recherche pour le Développement, Laboratoire HEA, BP 5045, 34032 Montpellier cedex 1, France 2CNRS, Laboratoire d¹Océanographie et de Biogéochimie UMR 6535 (COM-OSU), Campus de Luminy, 13288 Marseille, France *Present address: Institut de Recherche pour le Développement, Université Montpellier II, UMR 5556, Case 093, 34095 Montpellier cedex 05, France. E-mail: torreton@ird.fr ABSTRACT: Knowledge of the factors regulating bacterioplankton growth is of considerable importance in attempts to understand the functioning of biogeochemical cycles and particularly their evolution after perturbation. We first tested the effect of nutrient additions on the growth of bacterioplankton assemblages collected from 10 atoll lagoons of various morphologies in the Tuamotu Archipelago and in oceanic surface waters surrounding them. Then, we examined these responses in relation to ambient nutrient concentrations and bacterioplankton community turnover rates in these lagoons. The lagoons studied exhibited a range of NH4 (~0 to 0.7 μM), NO2+NO3 (~0 to 0.5 μM), and PO4 (~0 to 0.3 μM) concentrations. Responses were assessed on bacterioplankton grown in seawater cultures during 2 seasons (end of rainy season, end of dry season) and amended with NH4-N, PO4-P or glucose-C in all possible combinations. The 10 lagoons investigated exhibited various responses to nutrient additions. Including co-stimulations, bacterioplankton growth was stimulated by C, N and P additions in 4, 10 and 4 cases, respectively. One atoll lagoon showed inconsistent responses during both cruises. Another one showed no response to any nutrient addition. On the other hand, the oceanic subsurface samples showed a systematic stimulation by glucose, in one case with a concomitant positive effect of N. Expressed as percentages of the unamended controls, responses to ammonium and phosphorus additions in the different lagoons investigated appeared to decrease with increasing ammonium and phosphorus concentrations, respectively. This correspondence suggests that in situ concentrations reflect the nutrient status of bacterioplankton in the sites visited. NH4-N appeared as the most frequently stimulatory nutrient in the atolls investigated. This is in agreement with the close log-log correlation (p < 0.001) observed between bacterioplankton turnover rates and DIN/PO4 ratio. KEY WORDS: Atoll lagoon · Bacterioplankton · Nutrient limitation · Ammonium · Phosphorus Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 21, No. 2. Publication date: March 31, 2000 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2000 Inter-Research." @default.
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• W2071478415 title "Nutrient stimulation of bacterioplankton growth in Tuamotu atoll lagoons" @default.
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