Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean
We measured biogenic silica (bSiO2) dissolution and production rates at 3 Southern Ocean sites with contrasting biogeochemical regimes (SAZ-Sense cruise, January to February 2007). Two sites were located in the Subantarctic Zone (SAZ) southeast and southwest of Tasmania, and 1 site was in the Polar...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/169089 2023-05-15T18:24:59+02:00 Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean Fripiat, François Leblanc, Karine Elskens, Marc Cavagna, Anne-Julie Armand, Leanne André, Luc Dehairs, Frank Cardinal, Damien 2011-08 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169089 https://dipot.ulb.ac.be/dspace/bitstream/2013/169089/3/doi_152719.pdf en eng uri/info:doi/10.3354/meps09237 uri/info:scp/80051977005 https://dipot.ulb.ac.be/dspace/bitstream/2013/169089/3/doi_152719.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169089 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Marine ecology. Progress series, 435 Océanographie biologique Evolution des espèces Ecologie Biogenic silica Diatoms Dissolution Production Silicon cycle Southern Ocean info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2011 ftunivbruxelles 2022-06-12T21:03:36Z We measured biogenic silica (bSiO2) dissolution and production rates at 3 Southern Ocean sites with contrasting biogeochemical regimes (SAZ-Sense cruise, January to February 2007). Two sites were located in the Subantarctic Zone (SAZ) southeast and southwest of Tasmania, and 1 site was in the Polar Frontal Zone (PFZ). The measurements were repeated 3 times within a time frame of 4 to 7 d. In the PFZ and the western SAZ, the release of silicon from dissolving bSiO2, following a productive period, appeared sufficient to entirely sustain Si demand in surface waters. Biogenic silica dissolution was more efficient in the SAZ, likely owing to stronger microzooplankton grazing and bacterial activity. The degree of iron co-limitation correlated to bSiO2 growth rates (VSi, d-1). Highest rates were observed in the SAZ, southeast of Tasmania, a region influenced by iron-enriched East Australian Current water advecting through the Subtropical Front. The diatom communities appeared differently adapted and conditioned, in terms of uptake ability, for growth under low Si(OH)4 availability. Combining our results with existing bSiO2 dissolution and production data, we estimate a spring to summer net bSiO2 production for the circumpolar SAZ and PFZ regions of 7.4 and 3.6 Tmol yr-1, respectively, representing 4.3 and 2.1% of the global net bSiO2 production for each region. Furthermore, a clear seasonal pattern emerges with (1) higher bSiO2 production in spring (0.9 to 12.7 and 6.8 to 60.7 mmol Si m-2 d-1 for the SAZ and PFZ, respectively) compared to summer (0.1 to 6.6 and 0.3 to 9.1 mmol Si m-2 d-1 for the SAZ and PFZ, respectively) and (2) a bSiO2 dissolution to production ratio of <1 in spring (~0.4) and generally >1 in summer (~1.7). © Inter-Research 2011. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Southern Ocean DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Southern Ocean |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Océanographie biologique Evolution des espèces Ecologie Biogenic silica Diatoms Dissolution Production Silicon cycle Southern Ocean |
spellingShingle |
Océanographie biologique Evolution des espèces Ecologie Biogenic silica Diatoms Dissolution Production Silicon cycle Southern Ocean Fripiat, François Leblanc, Karine Elskens, Marc Cavagna, Anne-Julie Armand, Leanne André, Luc Dehairs, Frank Cardinal, Damien Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
topic_facet |
Océanographie biologique Evolution des espèces Ecologie Biogenic silica Diatoms Dissolution Production Silicon cycle Southern Ocean |
description |
We measured biogenic silica (bSiO2) dissolution and production rates at 3 Southern Ocean sites with contrasting biogeochemical regimes (SAZ-Sense cruise, January to February 2007). Two sites were located in the Subantarctic Zone (SAZ) southeast and southwest of Tasmania, and 1 site was in the Polar Frontal Zone (PFZ). The measurements were repeated 3 times within a time frame of 4 to 7 d. In the PFZ and the western SAZ, the release of silicon from dissolving bSiO2, following a productive period, appeared sufficient to entirely sustain Si demand in surface waters. Biogenic silica dissolution was more efficient in the SAZ, likely owing to stronger microzooplankton grazing and bacterial activity. The degree of iron co-limitation correlated to bSiO2 growth rates (VSi, d-1). Highest rates were observed in the SAZ, southeast of Tasmania, a region influenced by iron-enriched East Australian Current water advecting through the Subtropical Front. The diatom communities appeared differently adapted and conditioned, in terms of uptake ability, for growth under low Si(OH)4 availability. Combining our results with existing bSiO2 dissolution and production data, we estimate a spring to summer net bSiO2 production for the circumpolar SAZ and PFZ regions of 7.4 and 3.6 Tmol yr-1, respectively, representing 4.3 and 2.1% of the global net bSiO2 production for each region. Furthermore, a clear seasonal pattern emerges with (1) higher bSiO2 production in spring (0.9 to 12.7 and 6.8 to 60.7 mmol Si m-2 d-1 for the SAZ and PFZ, respectively) compared to summer (0.1 to 6.6 and 0.3 to 9.1 mmol Si m-2 d-1 for the SAZ and PFZ, respectively) and (2) a bSiO2 dissolution to production ratio of <1 in spring (~0.4) and generally >1 in summer (~1.7). © Inter-Research 2011. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Fripiat, François Leblanc, Karine Elskens, Marc Cavagna, Anne-Julie Armand, Leanne André, Luc Dehairs, Frank Cardinal, Damien |
author_facet |
Fripiat, François Leblanc, Karine Elskens, Marc Cavagna, Anne-Julie Armand, Leanne André, Luc Dehairs, Frank Cardinal, Damien |
author_sort |
Fripiat, François |
title |
Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
title_short |
Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
title_full |
Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
title_fullStr |
Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
title_full_unstemmed |
Efficient silicon recycling in summer in both the Polar Frontal and Subantarctic Zones of the Southern Ocean |
title_sort |
efficient silicon recycling in summer in both the polar frontal and subantarctic zones of the southern ocean |
publishDate |
2011 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169089 https://dipot.ulb.ac.be/dspace/bitstream/2013/169089/3/doi_152719.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Marine ecology. Progress series, 435 |
op_relation |
uri/info:doi/10.3354/meps09237 uri/info:scp/80051977005 https://dipot.ulb.ac.be/dspace/bitstream/2013/169089/3/doi_152719.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169089 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766206060603899904 |