FN Archimer Export Format PT J TI Estimating biogenic silica production of Rhizaria in the global ocean BT AF Llopis Monferrer, Natalia Boltovskoy, Demetrio Tréguer, Paul Mendez Sandin, Miguel Not, Fabrice Leynaert, Aude AS 1:1,2;2:3;3:1;4:2;5:2;6:4; FF 1:;2:;3:;4:;5:;6:; C1 Univ Brest, CNRS, IRD, Ifremer, LEMAR Plouzane, France Sorbonne University, CNRS, UMR7144, Ecology of Marine Plankton Team, Station Biologique de Roscoff, Roscoff, France University of Buenos Aires‐CONICET Institute of Ecology, Genetics and Evolution of Buenos Aires ,Argentina Univ Brest, CNRS, IRD, Ifremer, LEMAR Plouzane, France C2 UBO, FRANCE UNIV SORBONNE, FRANCE UNIV BUENOS AIRES, ARGENTINA CNRS, FRANCE UM LEMAR IN WOS Cotutelle UMR copubli-france copubli-univ-france copubli-int-hors-europe copubli-sud IF 5.703 TC 20 UR https://archimer.ifremer.fr/doc/00609/72154/70904.pdf https://archimer.ifremer.fr/doc/00609/72154/70905.pdf https://archimer.ifremer.fr/doc/00609/72154/70906.xlsx https://archimer.ifremer.fr/doc/00609/72154/70907.xlsx https://archimer.ifremer.fr/doc/00609/72154/70908.xlsx LA English DT Article CR MOOSE-GE MOOSE-GE 2017 MOOSE-GE 2018 BO L'Atalante DE ;silica cycle;silicic acid uptake;Rhizaria;Polycystina;Phaeodaria;Radiolaria AB Siliceous polycystines and phaeodarians are open‐ocean planktonic protists found throughout the water column and characterized by complex siliceous skeletons that are formed, at least partly, through the uptake of silicic acid. These protists contribute to the marine organic carbon (C) and biogenic silica (bSi) pools but little is known about their contribution to the silica (Si) biogeochemical cycle. Here we report the first measurements of the Si uptake rate of polycystine and phaeodarian cells from samples collected in the Mediterranean Sea using the 32Si based method. The elementary composition (bSi, particulate organic carbon and nitrogen) of these organisms was also measured. Combining our results with published data on the distribution and abundance of Polycystina and Phaeodaria in the global ocean, we conclude that these organisms could contribute from 0.2 to 2.2 mmol Si m‐2 of the marine standing stock of bSi and from 2 to 58 Tmol Si yr‐1 (1 to 19%) of the global oceanic biogenic silica production. The implications for the global marine Si cycle are discussed. PY 2020 PD MAR SO Global Biogeochemical Cycles SN 0886-6236 PU American Geophysical Union (AGU) VL 34 IS 3 UT 000522031600010 DI 10.1029/2019GB006286 ID 72154 ER EF