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- W2092022691 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 17:267-278 (1999) - doi:10.3354/ame017267 Nitrification rates in the NW Mediterranean Sea Micheline Bianchi1,*, Christine Fosset1, Pascal Conan2 1Laboratoire de Microbiologie Marine, CNRS/INSU UPR 223, Université de la Méditerranée, Campus de Luminy, Case 907, F-13288 Marseille Cedex 9, France 2COM-LOB, Campus de Luminy, Case 901, F-13288 Marseille Cedex 9, France *E-mail: m-bianchi@luminy.univ-mrs.fr ABSTRACT: During spring, ammonium oxidation and nitrite oxidation rates were measured in the NW basin of the Mediterranean Sea, from mesotrophic sites (Ligurian Sea and Gulf of Lions) to oligotrophic sites (Balearic Islands). Nitrification rates (average values for 37 measurements) ranged from 72 to 144 nmol of N oxidised l-1 d-1, except in the Rhône River plume area where the rates increased to 264-504 nmol l-1 d-1 because of the riverine inputs of nitrogen. Maximal rates were located around the peak of nitrite within the nitracline at about 40 to 60 m and just above the phosphacline. At 1 station, relatively high values of nitrification (50 to 130 nmol l-1 d-1) were also measured deep in the water column (240 m). Day-to-day variations were measured demonstrating the response within a few hours to hydrological stress (wind-induced mixing of the water column) and showing the role of hydrological characteristics on the distribution of nitrification rates. Because of the homogenous temperature (13°C) in the Mediterranean Sea, the spatial (geographical and vertical) fluctuations of nitrifying rates were linked to the presence of substrate due to mineralisation processes and/or Rhône River inputs. We estimate the contribution of nitrate produced by nitrification to the N demand of phytoplankton to range from 16% at mesotrophic to 61% at oligotrophic stations. KEY WORDS: Mediterranean Sea · Nitrification · Spatial variability · Short-term fluctuation · N budget Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 17, No. 3. Publication date: June 18, 1999 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 1999 Inter-Research." @default.
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- W2092022691 title "Nitrification rates in the NW Mediterranean Sea" @default.
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