Quantification of algal iron requirements in the Subantarctic Southern Ocean.
International audience Shipboard iron-addition incubation experiments were carried out in the Indian sector of the Subantarctic Southern Ocean duringthe Antares-IV campaign in late January–February 1999. The aim of these experiments was to estimate the dissolved iron requirements of the native phyto...
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2002
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Online Access: | https://hal.science/hal-00480620 |
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openpolar |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
algal iron requirements Subantarctic Southern Ocean (Indian sector) [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
algal iron requirements Subantarctic Southern Ocean (Indian sector) [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Blain, Stéphane Sedwick, Peter Griffiths, Brian Queguiner, Bernard Bucciarelli, Eva Fiala, Michel Pondaven, Philippe Tréguer, Paul Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
topic_facet |
algal iron requirements Subantarctic Southern Ocean (Indian sector) [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Shipboard iron-addition incubation experiments were carried out in the Indian sector of the Subantarctic Southern Ocean duringthe Antares-IV campaign in late January–February 1999. The aim of these experiments was to estimate the dissolved iron requirements of the native phytoplankton community in this oceanic region, in order to improve the parameterisation of iron as a limitingnutrient in a coupled 1D physical–biogeochemical ocean model. The experiments were conducted with plankton collected from the upper water column (B20m depth) at three sites in the Crozet Basin between 43–461S and 61–651E: (1) the Polar Front Zone (PFZ, dissolved Fe=0.33 nM), (2) the confluence of the Subantarctic and Subtropical Fronts (SAF/STF, dissolved Fe=0.29 nM), and (3) the southern Subtropical Zone (STZ, dissolved Fe=0.09 nM). Experimental results from each site indicate that algal community growth rates varied as a function of added iron concentration. Monod saturation functions fitted to the experimental data yield estimates for the community half-saturation constant for growth with respect to iron (Km) of 0.41–0.45nM Fe (PFZ), 0.055–0.086nM Fe (SAF/STF) and 0.092–0.093nM Fe (STZ, with macronutrients added), each of which has an estimated uncertainty of 720%. The Km estimate for the SAF/STF site reflects the mixed algal assemblage (diatoms+nanoplankton+dinoflagellates) that grew in the experimental incubations, whereas the Km estimates for the PFZ and STZ sites probably reflect the Fe requirements of the small pennate diatoms such as Pseudo-nitzschia spp., which dominated the algal biomass produced in these experiments. The fact that there are significant differences between the Km estimates for the PFZ and STZ sites suggests that similar diatom assemblages may have quite different iron requirements, perhaps due to differences in environmental conditions (e.g., light, macronutrient levels). We also examine the sensitivity of a onedimensional coupled physical–biogeochemical model to the choice of Km for ... |
author2 |
Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Bermuda Biological Station for Research (BBSR) Bermuda Biological Station for Research Institute of Antarctic and Southern Ocean Studies (IASOS) University of Tasmania Hobart, Australia (UTAS) Division of Marine and Atmospheric Research (CSIRO) Commonwealth Scientific and Industrial Research Organisation Canberra (CSIRO) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie biologique de Banyuls (LOBB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Blain, Stéphane Sedwick, Peter Griffiths, Brian Queguiner, Bernard Bucciarelli, Eva Fiala, Michel Pondaven, Philippe Tréguer, Paul |
author_facet |
Blain, Stéphane Sedwick, Peter Griffiths, Brian Queguiner, Bernard Bucciarelli, Eva Fiala, Michel Pondaven, Philippe Tréguer, Paul |
author_sort |
Blain, Stéphane |
title |
Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
title_short |
Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
title_full |
Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
title_fullStr |
Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
title_full_unstemmed |
Quantification of algal iron requirements in the Subantarctic Southern Ocean. |
title_sort |
quantification of algal iron requirements in the subantarctic southern ocean. |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00480620 |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0146-6291 Deep Sea Research https://hal.science/hal-00480620 Deep Sea Research, 2002, 49 (16), pp.3255-3273 |
op_relation |
hal-00480620 https://hal.science/hal-00480620 |
_version_ |
1790608409407520768 |
spelling |
ftsorbonneuniv:oai:HAL:hal-00480620v1 2024-02-11T10:08:48+01:00 Quantification of algal iron requirements in the Subantarctic Southern Ocean. Blain, Stéphane Sedwick, Peter Griffiths, Brian Queguiner, Bernard Bucciarelli, Eva Fiala, Michel Pondaven, Philippe Tréguer, Paul Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Bermuda Biological Station for Research (BBSR) Bermuda Biological Station for Research Institute of Antarctic and Southern Ocean Studies (IASOS) University of Tasmania Hobart, Australia (UTAS) Division of Marine and Atmospheric Research (CSIRO) Commonwealth Scientific and Industrial Research Organisation Canberra (CSIRO) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie biologique de Banyuls (LOBB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2002 https://hal.science/hal-00480620 en eng HAL CCSD Elsevier hal-00480620 https://hal.science/hal-00480620 ISSN: 0146-6291 Deep Sea Research https://hal.science/hal-00480620 Deep Sea Research, 2002, 49 (16), pp.3255-3273 algal iron requirements Subantarctic Southern Ocean (Indian sector) [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2002 ftsorbonneuniv 2024-01-23T23:37:01Z International audience Shipboard iron-addition incubation experiments were carried out in the Indian sector of the Subantarctic Southern Ocean duringthe Antares-IV campaign in late January–February 1999. The aim of these experiments was to estimate the dissolved iron requirements of the native phytoplankton community in this oceanic region, in order to improve the parameterisation of iron as a limitingnutrient in a coupled 1D physical–biogeochemical ocean model. The experiments were conducted with plankton collected from the upper water column (B20m depth) at three sites in the Crozet Basin between 43–461S and 61–651E: (1) the Polar Front Zone (PFZ, dissolved Fe=0.33 nM), (2) the confluence of the Subantarctic and Subtropical Fronts (SAF/STF, dissolved Fe=0.29 nM), and (3) the southern Subtropical Zone (STZ, dissolved Fe=0.09 nM). Experimental results from each site indicate that algal community growth rates varied as a function of added iron concentration. Monod saturation functions fitted to the experimental data yield estimates for the community half-saturation constant for growth with respect to iron (Km) of 0.41–0.45nM Fe (PFZ), 0.055–0.086nM Fe (SAF/STF) and 0.092–0.093nM Fe (STZ, with macronutrients added), each of which has an estimated uncertainty of 720%. The Km estimate for the SAF/STF site reflects the mixed algal assemblage (diatoms+nanoplankton+dinoflagellates) that grew in the experimental incubations, whereas the Km estimates for the PFZ and STZ sites probably reflect the Fe requirements of the small pennate diatoms such as Pseudo-nitzschia spp., which dominated the algal biomass produced in these experiments. The fact that there are significant differences between the Km estimates for the PFZ and STZ sites suggests that similar diatom assemblages may have quite different iron requirements, perhaps due to differences in environmental conditions (e.g., light, macronutrient levels). We also examine the sensitivity of a onedimensional coupled physical–biogeochemical model to the choice of Km for ... Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Southern Ocean Indian |