Articles | Volume 15, issue 18
Research article
20 Sep 2018
Research article |  | 20 Sep 2018

Silicon cycle in the tropical South Pacific: contribution to the global Si cycle and evidence for an active pico-sized siliceous plankton

Karine Leblanc, Véronique Cornet, Peggy Rimmelin-Maury, Olivier Grosso, Sandra Hélias-Nunige, Camille Brunet, Hervé Claustre, Joséphine Ras, Nathalie Leblond, and Bernard Quéguiner

Data sets

Biogenic and lithogenic particulate silica, diatom abundance and C biomass data during the OUTPACE (2015) cruise, SEANOE K. Leblanc and V. Cornet

Biogenic and lithogenic particulate silica collected during the BIOSOPE (2004) cruise, SEANOE B. Quéguiner and P. Rimmelin

Short summary
The Si biogeochemical cycle was studied during two oceanographic cruises in the tropical South Pacific in 2005 and 2015, between New Caledonia and the Chilean upwelling (8–34° S). Some of the lowest levels of biogenic silica stocks were found in the southern Pacific gyre, where Chlorophyll a concentrations are most depleted worldwide. Size-fractionated biogenic silica concentrations as well as Si kinetic uptake experiments revealed biological Si uptake by the picoplanktonic size fraction.
Final-revised paper