FN Archimer Export Format
PT J
TI Silicon cycle in the tropical South Pacific: contribution to the global Si cycle and evidence for an active pico-sized siliceous plankton
BT 
AF Leblanc, Karine
   Cornet, Véronique
   Rimmelin-Maury, Peggy
   Grosso, Olivier
   Hélias-Nunige, Sandra
   Brunet, Camille
   Claustre, Hervé
   Ras, Joséphine
   Leblond, Nathalie
   Quéguiner, Bernard
AS 1:1;2:1;3:2;4:1;5:1;6:1;7:3;8:3;9:3;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Aix-Marseille Univ., Université de Toulon, CNRS, IRD, MIO, UM110, Marseille, F-13288, France
   UMR 6539 LEMAR and UMS OSU IUEM - UBO, Université Européenne de Bretagne, Brest, France
   UPMC Univ Paris 06, UMR 7093, LOV, 06230 Villefranche-sur-mer, France
C2 UNIV AIX MARSEILLE, FRANCE
   UBO, FRANCE
   UNIV PARIS 06, FRANCE
UM LEMAR
IN DOAJ
IF 3.951
TC 14
UR https://archimer.ifremer.fr/doc/00448/56006/57514.pdf
   https://archimer.ifremer.fr/doc/00448/56006/59633.pdf
LA English
DT Article
CR BIOSOPE
   OUTPACE
BO L'Atalante
AB This article presents data regarding the Si biogeochemical cycle during two oceanographic cruises conducted in the Southern Tropical Pacific (BIOSOPE and OUTPACE cruises) in 2005 and 2015. It involves the first Si stock measurements in this understudied region, encompassing various oceanic systems from New Caledonia to the Chilean upwelling between 8 and 34°S. Some of the lowest levels of biogenic silica standing stocks ever measured were found in this area, notably in the Southern Pacific Gyre, where Chlorophyll a concentrations are most depleted worldwide. Integrated biogenic silica stocks are as low as 1.08±0.95mmolm−2, and are the lowest stocks measured in the Southern Pacific. Size-fractionated biogenic silica concentrations revealed a non-negligible contribution of the pico-sized fraction (<2–3µm) to biogenic silica standing stocks, representing 26±12% of total biogenic silica during the OUTPACE cruise and 11±9% during the BIOSOPE cruise. These results indicate significant accumulation in this size-class, which was undocumented for in 2005, but has since then been related to Si uptake by Synechococcus cells. Our Si kinetic uptake experiments carried out during BIOSOPE confirmed biological Si uptake by this size-fraction. We further present diatoms community structure associated with the stock measurements for a global overview of the Si cycle in the Southern Tropical Pacific. 
PY 2018
PD SEP
SO Biogeosciences
SN 1726-4170
PU Copernicus GmbH
VL 15
IS 18
UT 000445400700001
BP 5595
EP 5620
DI 10.5194/bg-2018-149
ID 56006
ER

EF