FN Archimer Export Format
PT J
TI Sponge skeletons as an important sink of silicon in the global oceans
BT 
AF Maldonado, Manuel
   López-Acosta, María
   Sitjà, Cèlia
   García-Puig, Marta
   Galobart, Cristina
   Ercilla, Gemma
   Leynaert, Aude
AS 1:1;2:1;3:1;4:1;5:1;6:2;7:3;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Center for Advanced Studies of Blanes (CEAB), Spanish National Research Council (CSIC), Girona, Spain
   Institute of Marine Sciences (ICM-CSIC), Barcelona, Spain
   University of Brest, CNRS, LEMAR, Plouzané, France
C2 CSIC, SPAIN
   ICM-CSIC, SPAIN
   CNRS, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-europe
IF 13.566
TC 49
UR https://archimer.ifremer.fr/doc/00595/70713/68934.pdf
   https://archimer.ifremer.fr/doc/00595/70713/68935.pdf
   https://archimer.ifremer.fr/doc/00595/70713/68936.xlsx
   https://archimer.ifremer.fr/doc/00595/70713/68937.xlsx
   https://archimer.ifremer.fr/doc/00595/70713/68938.xlsx
   https://archimer.ifremer.fr/doc/00595/70713/68939.xlsx
   https://archimer.ifremer.fr/doc/00595/70713/68940.xlsx
LA English
DT Article
AB Silicon (Si) is a pivotal element in the biogeochemical and ecological functioning of the ocean. The marine Si cycle is thought to be in internal equilibrium, but the recent discovery of Si entries through groundwater and glacial melting have increased the known Si inputs relative to the outputs in the global oceans. Known outputs are due to the burying of diatom skeletons or their conversion into authigenic clay by reverse weathering. Here we show that non-phototrophic organisms, such as sponges and radiolarians, also facilitate significant Si burial through their siliceous skeletons. Microscopic examination and digestion of sediments revealed that most burial occurs through sponge skeletons, which, being unusually resistant to dissolution, had passed unnoticed in the biogeochemical inventories of sediments. The preservation of sponge spicules in sediments was 45.2 ± 27.4%, but only 6.8 ± 10.1% for radiolarian testa and 8% for diatom frustules. Sponges lead to a global burial flux of 1.71 ± 1.61 TmolSi yr−1 and only 0.09 ± 0.05 TmolSi yr−1 occurs through radiolarians. Collectively, these two non-phototrophically produced silicas increase the Si output of the ocean to 12.8 TmolSi yr−1, which accounts for a previously ignored sink that is necessary to adequately assess the global balance of the marine Si cycle. 
PY 2019
PD OCT
SO Nature Geoscience
SN 1752-0894
PU Springer Science and Business Media LLC
VL 12
IS 10
UT 000488223800009
BP 815
EP 822
DI 10.1038/s41561-019-0430-7
ID 70713
ER

EF