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)...
Published in: | Limnology and Oceanography |
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Association for the Sciences of Limnology and Oceanography
2021
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/35688 2023-05-15T13:46:14+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-François SAFI, Karl PINKERTON, Matthew NOT, Fabrice 2021 https://oskar-bordeaux.fr/handle/20.500.12278/35688 https://doi.org/10.1002/lno.11743 en eng Association for the Sciences of Limnology and Oceanography 0024-3590 https://oskar-bordeaux.fr/handle/20.500.12278/35688 doi:10.1002/lno.11743 Planète et Univers [physics]/Océan Atmosphère Article de revue 2021 ftoskarbordeaux https://doi.org/10.1002/lno.11743 2021-05-11T22:29:43Z 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 32 Si 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. Other/Unknown Material Antarc* Antarctic Ross Sea Southern Ocean OSKAR Bordeaux (Open Science Knowledge ARchive) Antarctic Southern Ocean The Antarctic Austral Ross Sea Pacific Limnology and Oceanography 66 6 2187 2202 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Océan Atmosphère |
spellingShingle |
Planète et Univers [physics]/Océan Atmosphère LLOPIS MONFERRER, Natalia LEYNAERT, Aude TRÉGUER, Paul GUTIÉRREZ-RODRÍGUEZ, Andrés MORICEAU, Brivaela GALLINARI, Morgane LATASA, Mikel L'HELGUEN, Stéphane MAGUER, Jean-François SAFI, Karl PINKERTON, Matthew NOT, Fabrice Role of small Rhizaria and diatoms in the pelagic silica production of the Southern Ocean |
topic_facet |
Planète et Univers [physics]/Océan Atmosphère |
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 32 Si 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 |
Other/Unknown Material |
author |
LLOPIS MONFERRER, Natalia LEYNAERT, Aude TRÉGUER, Paul GUTIÉRREZ-RODRÍGUEZ, Andrés MORICEAU, Brivaela GALLINARI, Morgane LATASA, Mikel L'HELGUEN, Stéphane MAGUER, Jean-François SAFI, Karl PINKERTON, Matthew NOT, Fabrice |
author_facet |
LLOPIS MONFERRER, Natalia LEYNAERT, Aude TRÉGUER, Paul GUTIÉRREZ-RODRÍGUEZ, Andrés MORICEAU, Brivaela GALLINARI, Morgane LATASA, Mikel L'HELGUEN, Stéphane MAGUER, Jean-François SAFI, Karl PINKERTON, Matthew 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 |
Association for the Sciences of Limnology and Oceanography |
publishDate |
2021 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/35688 https://doi.org/10.1002/lno.11743 |
geographic |
Antarctic Southern Ocean The Antarctic Austral Ross Sea Pacific |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral Ross Sea Pacific |
genre |
Antarc* Antarctic Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Southern Ocean |
op_relation |
0024-3590 https://oskar-bordeaux.fr/handle/20.500.12278/35688 doi:10.1002/lno.11743 |
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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1766238792491991040 |