Articles | Volume 15, issue 18
Biogeosciences, 15, 5595–5620, 2018
https://doi.org/10.5194/bg-15-5595-2018

Special issue: Interactions between planktonic organisms and biogeochemical...

Biogeosciences, 15, 5595–5620, 2018
https://doi.org/10.5194/bg-15-5595-2018
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 et al.

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Latest update: 08 Aug 2022
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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.
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