%0 Journal Article
%T Contrasted geographical distribution of N$_2$ fixation rates and $nif$H phylotypes in the Coral and Solomon Seas (southwestern Pacific) during austral winter conditions
%+ Institut méditerranéen d'océanologie (MIO)
%+ Ecosystèmes Insulaires Océaniens (UMR 241) (EIO)
%+ Institut de Recherche pour le Développement (IRD)
%+ University of California [Santa Cruz] (UC Santa Cruz)
%+ Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS)
%+ Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS)
%+ Océan du Large et Variabilité Climatique (OLVAC)
%+ Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR)
%+ Laboratoire de physique des océans (LPO)
%+ Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
%A Bonnet, Sophie
%A Rodier, Martine
%A Turk-Kubo, Kendra A.
%A Germineaud, Cyril
%A Menkès, Christophe E.
%A Ganachaud, Alexandre
%A Cravatte, Sophie
%A Raimbault, Patrick
%A Campbell, Ellen
%A Quéroué, Fabien
%A Sarthou, Géraldine
%A Desnues, Anne
%A Maes, Christophe
%A Eldin, Gérard
%< avec comité de lecture
%@ 0886-6236
%J Global Biogeochemical Cycles
%I American Geophysical Union
%V 29
%N 11
%P 1874 - 1892
%8 2015-11
%D 2015
%R 10.1002/2015gb005117
%K nitrogen-fixation
%K Trichodesmium SPP.
%K Dinitrogen-fixation
%K numerical-model
%K NORTH-ATLANTIC North-Atlantic
%K Cyanobacteria Cultures Optical
%K Diversity
%K Ocean
%K Iron
%K Sensitivity
%K ACL
%Z Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]
%Z Environmental Sciences/Biodiversity and Ecology
%Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles
%X Biological dinitrogen (N$_2$) fixation and the distribution of diazotrophic phylotypes were investigated during two cruises in the Coral Sea and the Solomon Sea (southwestern Pacific) during austral winter conditions. N$_2$ fixation rates were measurable at every station, but integrated (0-150 m) rates were an order of magnitude higher in the Solomon Sea (30 to 5449 $\mu$mol N m$^{-2}$ d$^{-1}$ compared to those measured in the Coral Sea (2 to 109 $\mu$ mol N m$^{-2}$ d$^{-1}$. Rates measured in the Solomon Sea were in the upper range (100-1000 mu mol N m$^{-2}$ d$^{-1}$ or higher than rates compiled in the global MARine Ecosystem biomass DATa database, indicating that this region has some of the highest N$_2$ fixation rates reported in the global ocean. While unicellular diazotrophic cyanobacteria from group A (UCYN-A1 and UCYN-A2) and the proteobacteria $\gamma$-24774A11 dominated in the Coral Sea and were correlated with N$_2$ fixation rates (p < 0.05), $Trichodesmium$ and UCYN-B dominated in the Solomon Sea and were correlated (p < 0.05) with N$_2$ fixation rates. UCYN-A were totally absent in the Solomon Sea. The biogeographical distribution of diazotrophs is discussed within the context of patterns in measured environmental parameters.
%G English
%2 https://hal.science/hal-01496543/document
%2 https://hal.science/hal-01496543/file/2015GB005117.pdf
%L hal-01496543
%U https://hal.science/hal-01496543
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