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Bonnet, Sophie; Rodier, Martine; Turk‐Kubo, Kendra A.; Germineaud, Cyril; Menkes, Christophe; Ganachaud, Alexandre; Cravatte, Sophie; Raimbault, Patrick; Campbell, Ellen; Quéroué, Fabien; Sarthou, Géraldine; Desnues, Anne; Maes, Christophe; Eldin, Gerard

Contrasted geographical distribution of N2 fixation rates and nifH phylotypes in the Coral and Solomon Seas (southwestern Pacific) during austral winter conditions

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  • Medientyp: E-Artikel
  • Titel: Contrasted geographical distribution of N2 fixation rates and nifH phylotypes in the Coral and Solomon Seas (southwestern Pacific) during austral winter conditions
  • Beteiligte: Bonnet, Sophie; Rodier, Martine; Turk‐Kubo, Kendra A.; Germineaud, Cyril; Menkes, Christophe; Ganachaud, Alexandre; Cravatte, Sophie; Raimbault, Patrick; Campbell, Ellen; Quéroué, Fabien; Sarthou, Géraldine; Desnues, Anne; Maes, Christophe; Eldin, Gerard
  • Erschienen: American Geophysical Union (AGU), 2015
  • Erschienen in: Global Biogeochemical Cycles, 29 (2015) 11, Seite 1874-1892
  • Sprache: Englisch
  • DOI: 10.1002/2015gb005117
  • ISSN: 1944-9224; 0886-6236
  • Schlagwörter: Atmospheric Science ; General Environmental Science ; Environmental Chemistry ; Global and Planetary Change
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  • Beschreibung: <jats:title>Abstract</jats:title><jats:p>Biological dinitrogen (N<jats:sub>2</jats:sub>) 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<jats:sub>2</jats:sub> 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 µmol N m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup>) compared to those measured in the Coral Sea (2 to 109 µmol N m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup>). Rates measured in the Solomon Sea were in the upper range (100–1000 µmol N m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup>) or higher than rates compiled in the global MARine Ecosystem biomass DATa database, indicating that this region has some of the highest N<jats:sub>2</jats:sub> fixation rates reported in the global ocean. While unicellular diazotrophic cyanobacteria from group A (UCYN‐A1 and UCYN‐A2) and the proteobacteria <jats:italic>γ</jats:italic>‐24774A11 dominated in the Coral Sea and were correlated with N<jats:sub>2</jats:sub> fixation rates (<jats:italic>p</jats:italic> &lt; 0.05), <jats:italic>Trichodesmium</jats:italic> and UCYN‐B dominated in the Solomon Sea and were correlated (<jats:italic>p</jats:italic> &lt; 0.05) with N<jats:sub>2</jats:sub> 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.</jats:p>
  • Zugangsstatus: Freier Zugang