Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean
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)...
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ftarchimer:oai:archimer.ifremer.fr:80407 2023-05-15T13:47:37+02:00 Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean 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 2021-06 application/pdf https://archimer.ifremer.fr/doc/00692/80407/83515.pdf https://doi.org/10.1002/lno.11743 https://archimer.ifremer.fr/doc/00692/80407/ eng eng Wiley https://archimer.ifremer.fr/doc/00692/80407/83515.pdf doi:10.1002/lno.11743 https://archimer.ifremer.fr/doc/00692/80407/ info:eu-repo/semantics/openAccess restricted use Limnology And Oceanography (0024-3590) (Wiley), 2021-06 , Vol. 66 , N. 6 , P. 2187-2202 text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1002/lno.11743 2021-09-23T20:37:36Z 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. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Austral Pacific Ross Sea Southern Ocean The Antarctic Limnology and Oceanography 66 6 2187 2202 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
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 |
spellingShingle |
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 Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
author_facet |
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 |
author_sort |
Llopis Monferrer, Natalia |
title |
Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
title_short |
Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
title_full |
Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
title_fullStr |
Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
title_full_unstemmed |
Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
title_sort |
role of small rhizaria and diatoms in the pelagic silica production of the southern ocean |
publisher |
Wiley |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00692/80407/83515.pdf https://doi.org/10.1002/lno.11743 https://archimer.ifremer.fr/doc/00692/80407/ |
geographic |
Antarctic Austral Pacific Ross Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Pacific Ross Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Southern Ocean |
op_source |
Limnology And Oceanography (0024-3590) (Wiley), 2021-06 , Vol. 66 , N. 6 , P. 2187-2202 |
op_relation |
https://archimer.ifremer.fr/doc/00692/80407/83515.pdf doi:10.1002/lno.11743 https://archimer.ifremer.fr/doc/00692/80407/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/lno.11743 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
6 |
container_start_page |
2187 |
op_container_end_page |
2202 |
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1766247525062279168 |