FN Archimer Export Format
PT J
TI Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean
BT 
AF Llopis Monferrer, Natalia
   Leynaert, Aude
   Tréguer, Paul
   Gutiérrez‐Rodríguez, Andrés
   Moriceau, Brivaela
   Gallinari, Morgane
   Latasa, Mikel
   L'Helguen, Stéphane
   Maguer, Jean-Francois
   Safi, Karl
   Pinkerton, Matthew H.
   Not, Fabrice
AS 1:1,2;2:1;3:6;4:3;5:1;6:6;7:4;8:6;9:6;10:5;11:3;12:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 Univ Brest, CNRS, IRD,IFREMER, LEMAR F‐29280, Plouzane, France
   Sorbonne University, CNRS, UMR7144, Ecology of Marine Plankton Team, Station Biologique de Roscoff Roscoff, France
   National Institute of Water and Atmospheric Research Wellington, New Zealand
   Centro Oceanográfico de Gijón/Xixón Instituto Español de Oceanografía (IEO) Gijón/Xixón Asturias, Spain
   National Institute of Water and Atmospheric Research Hamilton, New Zealand
   Univ Brest, CNRS, IRD,IFREMER, LEMAR F‐29280, Plouzane, France
C2 CNRS, FRANCE
   UNIV SORBONNE, FRANCE
   NIWA, NEW ZEALAND
   IEO, SPAIN
   NIWA, NEW ZEALAND
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 5.019
TC 8
UR https://archimer.ifremer.fr/doc/00692/80407/83515.pdf
LA English
DT Article
AB We examined biogenic silica production and elementary composition (biogenic Si, particulate organic carbon and particulate organic nitrogen) of Rhizaria and diatoms in the upper 200 m along a transect in the Southwest Pacific sector of the Southern Ocean during austral summer (January–February 2019). From incubations using the 32Si radioisotope, silicic acid uptake rates were measured at 15 stations distributed in the Polar Front Zone, the Southern Antarctic Circumpolar Current and the Ross Sea Gyre. Rhizaria cells are heavily silicified (up to 7.6 nmol Si cell−1), displaying higher biogenic Si content than similar size specimens found in other areas of the global ocean, suggesting a higher degree of silicification of these organisms in the silicic acid rich Southern Ocean. Despite their high biogenic Si and carbon content, the Si/C molar ratio (average of 0.05 ± 0.03) is quite low compared to that of diatoms and relatively constant regardless of the environmental conditions. The direct measurements of Rhizaria's biogenic Si production (0.8–36.8 μmol Si m−2 d−1) are of the same order of magnitude than previous indirect estimations, confirming the importance of the Southern Ocean for the global Rhizaria silica production. However, diatoms largely dominated the biogenic Si standing stock and production of the euphotic layer, with low rhizarians' abundances and biogenic Si production (no more than 1%). In this manuscript, we discuss the Antarctic paradox of Rhizaria, that is, the potential high accumulation rates of biogenic Si due to Rhizaria in siliceous sediments despite their low production rates in surface waters. 
PY 2021
PD JUL
SO Limnology And Oceanography
SN 0024-3590
PU Wiley
VL 66
IS 6
UT 000646279600001
BP 2187
EP 2202
DI 10.1002/lno.11743
ID 80407
ER

EF