%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Bonnet, Sophie
%A Rodier, Martine
%A Turk-Kubo, K. A.
%A Germineaud, C.
%A Menkès, Christophe
%A Ganachaud, Alexandre
%A Cravatte, Sophie
%A Raimbault, P.
%A Campbell, E.
%A Queroue, F.
%A Sarthou, G.
%A Desnues, Anne
%A Maes, Christophe
%A Eldin, Gérard
%T Contrasted geographical distribution of N-2 fixation rates and nifH phylotypes in the Coral and Solomon Seas (southwestern Pacific) during austral winter conditions
%D 2015
%L fdi:010066151
%G ENG
%J Global Biogeochemical Cycles
%@ 0886-6236
%K PACIFIQUE ; SALOMON MER ; CORAIL MER
%M ISI:000368907500002
%N 11
%P 1874-1892
%R 10.1002/2015gb005117
%U https://www.documentation.ird.fr/hor/fdi:010066151
%> https://www.documentation.ird.fr/intranet/publi/2016/02/010066151.pdf
%V 29
%W Horizon (IRD)
%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 10(9) 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.
%$ 032 ; 036