A. E. Allen, M. H. Howard-jones, M. G. Booth, M. E. Frischer, P. G. Verity et al., Importance of heterotrophic bacterial assimilation of ammonium and nitrate in the Barents Sea during summer, Journal of Marine Systems, vol.38, issue.1-2, pp.93-108, 2002.
DOI : 10.1016/S0924-7963(02)00171-9

M. Altabet, Organic C, N, and stable isotopic composition of particulate matter collected on glass-fiber and aluminum oxide filters, Limnology and Oceanography, vol.35, issue.4, pp.902-909, 1990.
DOI : 10.4319/lo.1990.35.4.0902

A. K. Aufdenkampe, J. J. Mccarthy, M. Rodier, C. Navarrette, J. Dunne et al., Estimation of new production in the tropical Pacific, Global Biogeochemical Cycles, vol.32, issue.C1, pp.101-113, 2001.
DOI : 10.1029/2000GB001268

A. K. Aufdenkampe, J. J. Mccarthy, C. Navarrette, M. Rodier, J. Dunne et al., Biogeochemical controls on new production in the tropical Pacific, Deep Sea Research Part II: Topical Studies in Oceanography, vol.49, issue.13-14, pp.2619-2648, 2002.
DOI : 10.1016/S0967-0645(02)00051-6

M. Bianchi, F. Feliatra, P. Tréguertr´tréguer, M. Vincendeau, and J. Morvan, Nitrification rates, ammonium and nitrate distribution in upper layers of the water column and in sediments of the Indian sector of the Southern Ocean, Deep Sea Research Part II: Topical Studies in Oceanography, vol.44, issue.5, pp.1017-1032, 1997.
DOI : 10.1016/S0967-0645(96)00109-9

A. Bode, C. Castro, M. D. Doval, and M. Varela, New and regenerated production and ammonium regeneration in the western Bransfield Strait region (Antarctica) during phytoplankton bloom conditions in summer, Deep Sea Research Part II: Topical Studies in Oceanography, vol.49, issue.4-5, pp.787-804, 2002.
DOI : 10.1016/S0967-0645(01)00124-2

D. A. Bronk and P. Glibert, A 15N tracer method for the measurement of dissolved organic nitrogen release by phytoplankton, Marine Ecology Progress Series, vol.77, pp.171-182, 1991.
DOI : 10.3354/meps077171

D. A. Bronk, P. Glibert, and B. B. Ward, Nitrogen Uptake, Dissolved Organic Nitrogen Release, and New Production, Science, vol.265, issue.5180, pp.1843-1846, 1994.
DOI : 10.1126/science.265.5180.1843

E. I. Buttler, S. Knos, and M. I. Liddicoat, The relationship between inorganic and organic nutrients in sea water, Journal of the Marine Biological Association of the United Kingdom, vol.57, issue.01, pp.239-250, 1979.
DOI : 10.1016/S0003-2670(00)88444-5

D. M. Karl, Nutrient dynamics in the deep blue sea, Trends in Microbiology, vol.10, issue.9, pp.410-418, 2002.
DOI : 10.1016/S0966-842X(02)02430-7

D. M. Karl, R. Letelier, L. Tupas, J. Dore, C. et al., The role of nitrogen fixation in biochemical cycling in the subtropical North Pacific Ocean Marine dissolved organic matter: can its C:N ratio explain carbon over consumption?, Deep-sea Res. I, Nature, vol.386, issue.48, pp.533-538, 1997.

A. B. Kustka, E. J. Carpenter, S. Sanudo-wilhelmy, J. Burns, D. Capone et al., Iron requirements for N 2 and NH 4 supported growth in cultures of Trichodesmium (IMS 101): Comparison with nitrogen fixation rates and Fe:C ratios of field populations

E. Laws, N, Limnology and Oceanography, vol.29, issue.2, pp.379-386, 1984.
DOI : 10.4319/lo.1984.29.2.0379

P. S. Libby and P. A. Wheeler, Particulate and dissolved organic nitrogen in the central and eastern Equatorial Pacific, Deep-Sea Res, pp.345-361, 1996.

F. Lipschultz, N. R. Bates, C. Carlson, and D. A. Hansell, New production in the Sargasso Sea: History and current status, Global Biogeochemical Cycles, vol.289, issue.1, pp.10-1029, 2002.
DOI : 10.1029/2000GB001319

S. E. Lohrenz, S. A. Knauer, V. L. Asper, M. Tuel, A. F. Michaels et al., Seasonal variability in primary production and particle flux in the northwestern Sargasso Sea: U.S. JGOFS Bermuda Atlantic time-series study, Deep Sea Research Part A. Oceanographic Research Papers, vol.39, issue.7-8, pp.1373-1391, 1992.
DOI : 10.1016/0198-0149(92)90074-4

A. R. Longhurst, Ecological geography of the Sea, 1998.

T. H. Mague, E. Friberg, D. J. Hugues, M. , and I. , Extracellular release of carbon by marine phytoplankton; a physiological approach1, Limnology and Oceanography, vol.25, issue.2, pp.262-279, 1980.
DOI : 10.4319/lo.1980.25.2.0262

Y. Maita and M. Yanada, Vertical distribution of total dissolved nitrogen and dissolved organic nitrogen in seawater., GEOCHEMICAL JOURNAL, vol.24, issue.4, pp.245-254, 1990.
DOI : 10.2343/geochemj.24.245

D. W. Menzel and J. H. Ryther, The annual cycle of primary production in the Sargasso Sea off Bermuda, of N 2 fixation by unicellular diazotrophs in the oligotroph Pacific, pp.351-367, 1960.
DOI : 10.1016/0146-6313(59)90095-4

J. K. Moore, S. C. Doney, D. M. Glover, and I. Y. Fung, Iron cycling and nutrient limitation patterns in surface waters of the world ocean. Deep-sea res., part II, pp.463-507, 2002.

A. Morel and S. Maritorena, Bio-optical properties of oceanic waters: a reappraisal, J. Geo- 10 phys, Res, vol.106, issue.C4, pp.7163-7180, 2001.

A. Morel, B. Gentili, H. Clauster, M. Babin, A. Bricuad et al., Optical properties of the ???clearest??? natural waters, Limnology and Oceanography, vol.52, issue.1, pp.217-229, 2007.
DOI : 10.4319/lo.2007.52.1.0217

S. W. Nixon, Coastal marine eutrophication: A definition, social causes, and future concerns, Ophelia, vol.7, issue.1, pp.199-220, 1995.
DOI : 10.1080/00785236.1995.10422044

E. T. Peltzer and N. A. Hayward, Spatial and temporal variability of total organic carbon along the 140 ? W in the equatorial Pacific ocean in 1992, Global Biogeochem. Cycles, vol.6, pp.45-76, 1996.

J. C. Priscu and M. T. Downes, Nitrogen uptake, ammonium oxidation and nitrous oxide (N2O) levels in the coastal waters of western Cook Strait, New Zealand, Estuarine, Coastal and Shelf Science, vol.20, issue.5, pp.529-542, 1985.
DOI : 10.1016/0272-7714(85)90105-2

L. M. Procter and J. A. Fuhrman, Viral mortality of marine bacteria and cyanobateria, Nature, vol.343, pp.1327-1332, 1990.

P. Raimbault, G. Slawyk, B. Coste, and J. Fry, Feasibility of using an automated colorimetric procedure for the determination of seawater nitrate in the 0 to 100 nM range: Examples from field and culture, Marine Biology, vol.167, issue.2, pp.347-351, 1990.
DOI : 10.1007/BF01313277

P. Raimbault, N. Garcia, and C. , Distribution of inorganic and organic nutrients in the South Pacific Ocean – evidence for long-term accumulation of organic matter in nitrogen-depleted waters, Biogeosciences Discussions, vol.4, issue.4, pp.3041-3087, 2007.
DOI : 10.5194/bgd-4-3041-2007

P. Raimbault, G. Slawyk, B. Boudjellal, C. Coatanoan, P. Conan et al., Carbon and nitrogen uptake and export in the equatorial pacific at 150 ? W: Evidence of an efficient regenerated production cycle, C2, in the subtropical South pacific Ocean: a comparison between in situ and modelled data, Biogesciences Discuss, pp.3409-3451, 2007.

J. A. Raven, The iron and molybdenum use efficiencies of plant growth with different energy, carbon and nitrogen sources, New Phytologist, vol.213, issue.3, pp.279-287, 1988.
DOI : 10.1038/329710a0

A. C. Redfield, B. H. Ketchum, and F. A. Richards, The influence of organisms on the com- 10 position of seawater, pp.26-77, 1963.

A. P. Rees, I. Joint, D. , and D. M. , Early spring bloom phytoplankton-nutrient dynamics at the Celtic Sea Shelf Edge, Deep Sea Research Part I: Oceanographic Research Papers, vol.46, issue.3, pp.483-510, 1999.
DOI : 10.1016/S0967-0637(98)00073-9

J. H. Ryther and D. W. Menzel, The seasonal and geographical range of primary production in the Western Sargasso Sea, Deep Sea Research (1953), vol.6, pp.235-238, 1960.
DOI : 10.1016/0146-6313(59)90077-2

E. Sahlsten, Nitrogenous nutrition in the euphotic zone of the Central North Pacific Gyre, Marine Biology, vol.31, issue.3, pp.433-439, 1987.
DOI : 10.1007/BF00412528

G. Slawyk and Y. Collos, 13 C and 15 N uptake by marine phytoplankton III. Interactions in 20 euphotic zone profiles of stratified oceanic areas, Mar. Ecol. Prog. Series, vol.19, pp.223-231, 1984.

G. Slawyk and P. Raimbault, Simple procedure for simultaneous recovery of dissolved inorganic and organic nitrogen in 15N-tracer experiments and improving the isotopic mass balance, Marine Ecology Progress Series, vol.124, issue.64, pp.289-299, 1983.
DOI : 10.3354/meps124289

J. P. Zehr, E. J. Carpenter, and T. A. Villareal, New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans, Trends in Microbiology, vol.8, issue.2, pp.68-73, 2000.
DOI : 10.1016/S0966-842X(99)01670-4