N. S. Agawin, M. Benavides, A. Busquets, P. Ferriol, L. J. Stal et al., Dominance of unicellular cyanobacteria in the diazotrophic community in the Atlantic Ocean, Limnol. Oceanogr, vol.59, pp.623-637, 2014.
URL : https://hal.archives-ouvertes.fr/hal-00999277

I. Ambar and A. F. Fiúza, Some features of the Portugal Current System: a poleward slope undercurrent, an upwellingrelated summer southward flow and an autumn-winter poleward coastal surface current, Proceedings of the Second International Conference on Air-Sea Interaction and on Meteorology and Oceanography of the Coastal Zone, pp.286-287, 1994.

M. Benavides, N. Agawin, J. Arístegui, P. Ferriol, and L. Stal, Nitrogen fixation by Trichodesmium and small diazotrophs in the subtropical northeast Atlantic, Aquat. Microb. Ecol, vol.65, pp.43-53, 2011.
URL : https://hal.archives-ouvertes.fr/hal-00999284

M. Blais, J. Tremblay, A. D. Jungblut, J. Gagnon, J. Martin et al., Nitrogen fixation and identification of potential diazotrophs in the Canadian Arctic, Global Biogeochem. Cy, vol.26, pp.1-13, 2012.

D. Bombar, R. W. Paerl, L. Riemann, S. Bonnet, J. Dekaezemacker et al., Aphotic N 2 fixation in the Eastern Tropical South Pacific Ocean, Marine Non-Cyanobacterial Diazotrophs: Moving beyond Molecular Detection, vol.24, pp.1-14, 2013.

S. T. Braun, L. M. Proctor, S. Zani, M. T. Mellon, and J. P. Zehr, Molecular evidence for zooplankton-associated nitrogenfixing anaerobes based on amplification of the nifH gene, FEMS Microbiol. Ecol, vol.28, pp.273-279, 1999.

E. Breitbarth, A. Oschlies, and J. Laroche, Physiological constraints on the global distribution of Trichodesmium -effect of temperature on diazotrophy, Biogeosciences, vol.4, pp.53-61, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00297814

A. M. Cabello, F. M. Cornejo-castillo, N. Raho, D. Blasco, M. Vidal et al., Global distribution and vertical patterns of a prymnesiophyte-cyanobacteria obligate symbiosis, ISME J, vol.10, pp.693-706, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01289124

D. G. Capone, Trichodesmium, a Globally Significant Marine Cyanobacterium, Science, vol.276, pp.1221-1229, 1997.

D. G. Capone, J. A. Burns, J. P. Montoya, A. Subramaniam, C. Mahaffey et al.,

D. Fonseca-batista, Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical and subtropical North Atlantic Ocean, Global Biogeochem. Cy, vol.19, pp.1-17, 2005.

J. G. Caporaso, J. Kuczynski, J. Stombaugh, K. Bittinger, F. D. Bushman et al., QIIME allows analysis of highthroughput community sequencing data Intensity normalization improves color calling in SOLiD sequencing, Aquat. Microb. Ecol, vol.7, pp.3-14, 2005.

A. M. Comeau, G. M. Douglas, M. G. Langille, D. Turner, and K. A. Hunter, Microbiome Helper: a Custom and Streamlined Workflow for Microbiome Research, mSystems, The Biogeochemistry of Iron in Seawater, vol.2, pp.123-253, 2001.

C. De-boyer-montégut, G. Madec, A. S. Fischer, A. Lazar, and D. Iudicone, Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology, J. Geophys. Res, vol.109, pp.1-20, 2004.

T. O. Delmont, C. Quince, A. Shaiber, Ö. C. Esen, S. T. Lee et al., Nitrogen-fixing populations of Planctomycetes and Proteobacteria are abundant in surface ocean metagenomes, Spatial coupling of nitrogen inputs and losses in the ocean, vol.3, pp.163-167, 2007.

J. E. Dore, J. R. Brum, L. Tupas, K. , and D. M. , Seasonal and interannual variability in sources of nitrogen supporting export in the oligotrophic subtropical North Pacific Ocean, Limnol. Oceanogr, vol.47, pp.1595-1607, 2002.

S. T. Dyhrman and S. T. Haley, Phosphorus scavenging in the unicellular marine diazotroph Crocosphaera watsonii phosphorus scavenging in the unicellular marine diazotroph Crocosphaera watsonii, Appl. Environ. Microbiol, vol.72, pp.1452-1458, 2006.

S. T. Dyhrman, P. D. Chappell, S. T. Haley, J. W. Moffett, E. D. Orchard et al., Phosphonate utilization by the globally important marine diazotroph Trichodesmium, Nature, vol.439, pp.68-71, 2006.

P. G. Falkowski, Evolution of the nitrogen cycle and its influence on the biological sequestration of CO 2 in the ocean, Nature, vol.387, pp.272-275, 1997.

H. Farnelid, A. F. Andersson, S. Bertilsson, W. A. Al-soud, L. H. Hansen et al., Nitrogenase gene amplicons from global marine surface waters are dominated by genes of non-cyanobacteria, PLOS One, vol.6, pp.1-9, 2011.

H. Farnelid, M. Bentzon-tilia, A. F. Andersson, S. Bertilsson, G. Jost et al., Active nitrogen-fixing heterotrophic bacteria at and below the chemocline of the central Baltic Sea, ISME J, vol.7, pp.1413-1423, 2013.

A. Fernández, B. Mouriño-carballido, A. Bode, M. Varela, and E. Marañón, Latitudinal distribution of Trichodesmium spp. and N 2 fixation in the Atlantic Ocean, Biogeosciences, vol.7, pp.3167-3176, 2010.

I. Fernández, C. Raimbault, P. Garcia, N. Rimmelin, P. Fernández-gómez et al., An estimation of annual new production and carbon fluxes in the northeast Atlantic Ocean during, J. Geophys. Res, vol.110, pp.1026-1037, 2001.

A. F. Fiúza, D. Fonseca-batista, F. Dehairs, V. Riou, F. Fripiat et al., Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean, Hidrologia e dinâmica das águas costeiras de Portugal (Hydrology and dynamics of the Portuguese coastal waters), vol.294, pp.517-532, 1984.

R. Frouin, A. F. Fiúza, I. Ambar, and T. J. Boyd, Observations of a poleward surface current off the coasts of Portugal and Spain during winter, J. Geophys. Res, vol.95, pp.679-691, 1990.

H. E. Garcia, R. A. Locarnini, T. P. Boyer, J. I. Antonov, O. K. Baranova et al., Dissolved Inorganic Nutrients (phosphate, nitrate, silicate), vol.4, 2013.

M. I. García-ibáñez, P. C. Pardo, L. I. Carracedo, H. Mercier, P. Lherminier et al., Structure, transports and transformations of the water masses in the Atlantic Subpolar Gyre, Prog. Oceanogr, vol.135, pp.18-36, 2015.

K. Grasshoff, M. Ehrhardt, and K. Kremling, Methods of Seawater Analysis. Second, Revised and Extended Edition, 1983.

T. Großkopf, W. Mohr, T. Baustian, H. Schunck, D. Gill et al., Doubling of marine dinitrogen-fixation rates based on direct measurements, Nature, vol.488, pp.361-364, 2012.

N. Gruber, D. G. Capone, D. A. Bronk, M. M. Mulholland, and E. J. Carpenter, The Marine Nitrogen Cycle: Overview and Challenges, pp.1-50, 2008.

H. Halm, P. Lam, T. G. Ferdelman, G. Lavik, T. Dittmar et al., Heterotrophic organisms dominate nitrogen fixation in the South Pacific Gyre, ISME J, vol.6, pp.1238-1249, 2012.

T. Hama, T. Miyazaki, Y. Ogawa, T. Iwakuma, M. Takahashi et al., Measurement of photosynthetic production of a marine phytoplankton population using a stable 13 C isotope, Mar. Biol, vol.73, pp.31-36, 1983.

R. M. Holmes, A. Aminot, R. Kérouel, B. A. Hooker, and B. J. Peterson, A simple and precise method for measuring ammonium in marine and freshwater ecosystems, Can. J. Fish. Aquat. Sci, vol.56, pp.1801-1808, 1999.

J. B. Howard and D. C. Rees, Structural Basis of Biological Nitrogen Fixation, Chem. Rev, vol.96, pp.2965-2982, 1996.

J. Inoue, K. Oshima, W. Suda, M. Sakamoto, T. Iino et al., Distribution and evolution of nitrogen fixation genes in the phylum Bacteroidetes, Microbes Environ, vol.30, pp.44-50, 2015.

T. D. Jickells, The inputs of dust derived elements to the Sargasso Sea; a synthesis, Mar. Chem, vol.68, pp.61-65, 1999.

A. F. Khadem, A. Pol, M. S. Jetten, . Op-den, and H. J. Camp, Nitrogen fixation by the verrucomicrobial methanotroph "Methylacidiphilum fumariolicum, SolV, Microbiology, vol.156, pp.1052-1059, 2010.

M. Kimura, A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences, J. Mol. Evol, vol.16, pp.111-120, 1980.

A. Krupke, G. Lavik, H. Halm, B. M. Fuchs, R. I. Amann et al., Distribution of a consortium between unicellular algae and the N 2 fixing cyanobacterium UCYN-A in the North Atlantic Ocean, Environ. Microbiol, vol.16, pp.3153-3167, 2014.

S. Kumar, G. Stecher, and K. Tamura, MEGA7: Molecular Evolutionary Genetics Analysis version 7.0 for bigger datasets, Mol. Biol. Evol, vol.33, pp.1870-1874, 2016.

A. Landolfi, W. Koeve, H. Dietze, P. Kähler, and A. Oschlies, A new perspective on environmental controls, Geophys. Res. Lett, vol.42, pp.4482-2289, 2015.

R. Langlois, T. Großkopf, M. Mills, S. Takeda, and J. Laroche, Widespread Distribution and Expression of Gamma A (UMB), an Uncultured, Diazotrophic, ? -Proteobacterial nifH Phylotype, PLOS One, vol.10, pp.1-17, 2015.

R. J. Langlois, J. Laroche, and P. A. Raab, Diazotrophic Diversity and Distribution in the Tropical and Subtropical Atlantic Ocean Diazotrophic Diversity and Distribution in the Tropical and Subtropical Atlantic Ocean, Appl. Environ. Microb, vol.71, pp.7910-7919, 2005.

R. J. Langlois, D. Hümmer, and J. Laroche, Abundances and distributions of the dominant nifH phylotypes in the Northern Atlantic Ocean, Appl. Environ. Microb, vol.74, 1922.

N. Lemaitre, F. Planchon, H. Planquette, F. Dehairs, D. Fonsecabatista et al., High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from 234 Th fluxes, Biogeosciences, vol.15, pp.6417-6437, 2018.

X. Li, D. Fonseca-batista, N. Roevros, F. Dehairs, and L. Chou, Environmental and nutrient controls of marine nitrogen fixation, Prog. Oceanogr, vol.167, pp.125-137, 2018.

C. R. Loescher, T. Großkopf, F. D. Desai, D. Gill, H. Schunck et al., Subcellular localization of marine bacterial alkaline phosphatases, P. Natl. Acad. Sci. USA, vol.8, pp.21219-21223, 2009.

Y. Luo, S. C. Doney, L. A. Anderson, M. Benavides, I. Bermanfrank et al., Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates, vol.4, pp.47-73, 2012.

Y. Luo, I. D. Lima, D. M. Karl, C. A. Deutsch, and S. C. Doney, Data-based assessment of environmental controls on global marine nitrogen fixation, Biogeosciences, vol.11, pp.691-708, 2014.

D. Man-aharonovich, N. Kress, E. B. Zeev, I. Berman-frank, and O. Béjà, Molecular ecology of nifH genes and transcripts in the eastern Mediterranean Sea, Environ. Microbiol, vol.9, pp.2354-2363, 2007.

E. Marañón, P. M. Holligan, M. Varela, B. Mouriño, and A. J. Bale, Basin-scale variability of phytoplankton biomass, production and growth in the Atlantic Ocean, Deep-Sea Res, Pt. I, vol.47, pp.825-857, 2000.

C. Martínez-pérez, W. Mohr, C. R. Löscher, J. Dekaezemacker, S. Littmann et al., The small unicellular diazotrophic symbiont, UCYN-A, is a key player in the marine nitrogen cycle, Nat. Microbiol, vol.1, pp.1-7, 2016.

D. Fonseca-batista, The Subpolar Mode Water of the North Atlantic Ocean, Evidence of high N 2 fixation rates in the temperate northeast Atlantic McCartney, vol.12, pp.1169-1188, 1982.

M. M. Mills, C. Ridame, M. Davey, J. La-roche, and R. J. Geider, Iron and phosphorus co-limit nitrogen fixation in the eastern tropical North Atlantic, Nature, vol.429, pp.292-294, 2004.
URL : https://hal.archives-ouvertes.fr/hal-00166836

T. Miyajima, Y. Yamada, Y. T. Hanaba, K. Yoshii, K. Koitabashi et al., Determining the stable isotope ratio of total dissolved inorganic carbon in lake water by GC/C/IRMS, Limnol. Oceanogr, vol.40, pp.994-1000, 1995.

W. Mohr, T. Großkopf, D. W. Wallace, and J. Laroche, Methodological underestimation of oceanic nitrogen fixation rates, PLOS One, vol.5, pp.1-7, 2010.

J. P. Montoya, M. Voss, P. Kahler, and D. G. Capone, A Simple, High-Precision, High-Sensitivity Tracer Assay for N 2 Fixation, Appl. Environ. Microb, vol.62, pp.986-993, 1996.

J. P. Montoya, M. Voss, and D. G. Capone, Spatial variation in N 2 -fixation rate and diazotroph activity in the Tropical Atlantic, vol.4, pp.369-376, 2007.
URL : https://hal.archives-ouvertes.fr/hal-00297855

C. M. Moore, M. M. Mills, E. P. Achterberg, R. J. Geider, J. Laroche et al., Large-scale distribution of Atlantic nitrogen fixation controlled by iron availability, Nat. Geosci, vol.2, pp.867-871, 2009.

V. Moreira-coello, B. Mouriño-carballido, E. Marañón, A. Fernández-carrera, A. Bode et al., Biological N 2 Fixation in the Upwelling Region off NW Iberia: Magnitude, Relevance, and Players, Front, Mar. Sci, vol.4, pp.1-16, 2017.

M. R. Mulholland, P. W. Bernhardt, J. L. Blanco-garcia, A. Mannino, K. Hyde et al., Rates of dinitrogen fixation and the abundance of diazotrophs in North American coastal waters between Cape Hatteras and Georges Bank, Limnol. Oceanogr, vol.57, pp.1067-1083, 2012.

J. A. Needoba, R. A. Foster, C. Sakamoto, J. P. Zehr, J. et al., Nitrogen fixation by unicellular diazotrophic cyanobacteria in the temperate oligotrophic North Pacific Ocean, Limnol. Oceanogr, vol.52, pp.1317-1327, 2007.

M. Nei, Molecular Evolutionary Genetics, 1987.

U. Ohlendieck, A. Stuhr, and H. Siegmund, Nitrogen fixation by diazotrophic cyanobacteria in the Baltic Sea and transfer of the newly fixed nitrogen to picoplankton organisms, J. Marine Syst, vol.25, pp.16-22, 2000.

A. J. Poulton, P. M. Holligan, A. Hickman, Y. N. Kim, T. R. Adey et al., Phytoplankton carbon fixation, chlorophyll-biomass and diagnostic pigments in the Atlantic Ocean, Deep-Sea Res. Pt. II, vol.53, pp.1593-1610, 2006.

E. Rahav, E. Bar-zeev, S. Ohayon, H. Elifantz, N. Belkin et al., Dinitrogen fixation in aphotic oxygenated marine environments, Front. Microbiol, vol.4, pp.1-11, 2013.

E. Rahav, M. J. Giannetto, and E. Bar-zeev, Contribution of mono and polysaccharides to heterotrophic N 2 fixation at the eastern Mediterranean coastline, Sci. Rep, vol.6, pp.1-11, 2016.

J. Ras, H. Claustre, and J. Uitz, Spatial variability of phytoplankton pigment distributions in the Subtropical South Pacific Ocean: comparison between in situ and predicted data, Biogeosciences, vol.5, pp.353-369, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00330697

J. Ratten, The diversity, distribution and potential metabolism of non-cyanobacterial diazotrophs in the North Atlantic Ocean, p.485, 2017.

J. M. Ratten, J. Laroche, D. K. Desai, R. U. Shelley, W. M. Landing et al., Sources of iron and phosphate affect the distribution of diazotrophs in the North Atlantic, Deep-Sea Res. Pt. II, vol.116, pp.332-341, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01103077

J. A. Raven, The iron and molybdenum use efficiencies of plant growth with different energy, carbon and nitrogen sources, New Phytol, vol.109, pp.279-287, 1988.

A. Rees, J. Gilbert, and B. Kelly-gerreyn, Nitrogen fixation in the western English Channel, Mar. Ecol. Prog. Ser, vol.374, pp.7-12, 2009.

M. J. Rijkenberg, R. J. Langlois, M. M. Mills, M. D. Patey, P. G. Hill et al., Environmental forcing of nitrogen fixation in the Eastern Tropical and Sub-Tropical North Atlantic Ocean, PLOS One, vol.6, pp.1-13, 2011.

M. J. Rijkenberg, S. Steigenberger, C. F. Powell, H. Van-haren, M. D. Patey et al., Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean, Global Biogeochem. Cy, vol.26, pp.1-15, 2012.

V. Riou, D. Fonseca-batista, A. Roukaerts, I. C. Biegala, S. R. Prakya et al., Importance of N 2 -Fixation on the Productivity at the North-Western Azores Current/Front System, and the Abundance of Diazotrophic Unicellular Cyanobacteria, PLOS One, vol.11, pp.1-22, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01455155

G. Sarthou, A. R. Baker, S. Blain, E. P. Achterberg, M. Boye et al., Atmospheric iron deposition and sea-surface dissolved iron concentrations in the eastern Atlantic Ocean, Nitrogen-fixing bacteria associated with copepods in coastal waters of the North Atlantic Ocean, vol.50, pp.3754-3765, 2003.
URL : https://hal.archives-ouvertes.fr/hal-00456460

R. U. Shelley, M. Roca-martí, M. Castrillejo, V. Sanial, P. Masqué et al., Quantification of trace element atmospheric deposition fluxes to the Atlantic Ocean
URL : https://hal.archives-ouvertes.fr/hal-01483145

G. Geovide, T. Shiozaki, M. Ijichi, T. Kodama, S. Takeda et al., Heterotrophic bacteria as major nitrogen fixers in the euphotic zone of the Indian Ocean, Global Biogeochem. Cy, vol.119, pp.1096-1110, 2014.

T. Shiozaki, T. Nagata, M. Ijichi, and K. Furuya, Nitrogen fixation and the diazotroph community in the temperate coastal region of the northwestern North Pacific, Biogeosciences, vol.12, pp.4751-4764, 2015.

J. T. Snow, C. Schlosser, E. M. Woodward, M. M. Mills, E. P. Achterberg et al., Environmental controls on the biogeography of diazotrophy and Trichodesmium in the Atlantic Ocean, vol.29, pp.865-884, 2015.

A. Subramaniam, P. L. Yager, E. J. Carpenter, C. Mahaffey, K. Björkman et al., Amazon River enhances diazotrophy and carbon sequestration in the tropical North Atlantic Ocean, Global Biogeochem. Cy, vol.105, pp.1766-1771, 2008.

A. W. Thompson, R. A. Foster, A. Krupke, B. J. Carter, N. Musat et al., Unicellular Cyanobacterium Symbiotic with a Single-Celled Eukaryotic Alga, vol.337, pp.1546-1550, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01254002

C. Thuróczy, L. J. Gerringa, M. B. Klunder, R. Middag, P. Laan et al., Speciation of Fe in the Eastern North Atlantic Ocean, vol.57, pp.1444-1453, 2010.

M. Tonnard, H. Planquette, A. R. Bowie, P. Van-der-merwe, M. Gallinari et al., Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01), Biogeosciences Discuss, 2018.

M. Vidal, C. M. Duarte, A. , and S. , Dissolved organic nitrogen and phosphorus pools and fluxes in the central Atlantic Ocean, Limnol. Oceanogr, vol.44, pp.106-115, 1999.

M. Vidal, C. M. Duarte, S. Agustí, J. M. Gasol, D. Vaqué et al., Alkaline phosphatase activities in the central Atlantic Ocean indicate large areas with phosphorus deficiency, Mar. Ecol. Prog. Ser, vol.262, pp.8609-8616, 2003.

M. Voss, P. Croot, K. Lochte, M. Mills, and I. Peeken, Patterns of nitrogen fixation along 10 ? N in the tropical Atlantic, Geophys. Res. Lett, vol.31, pp.1-4, 2004.

J. T. Wertz, E. Kim, J. A. Breznak, T. M. Schmidt, J. L. Rodrigues et al., Genomic and physiological characterization of the Verrucomicrobia isolate Diplosphaera colitermitum gen. nov., sp. nov., reveals microaerophily and nitrogen fixation genes, Deep Sea Res. Oceanogr. Abstr, vol.78, pp.221-231, 1963.

S. Zani, M. T. Mellon, J. L. Collier, and J. P. Zehr, Expression of nifH genes in natural microbial assemblages in Lake George, Appl. Environ. Microb, vol.66, pp.3119-3124, 2000.

R. E. Zeebe and D. Wolf-gladrow, CO 2 in seawater: equilibrium, kinetics, isotopes, 2003.