Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin
International audience Dissolved Fe and ligand concentrations and the Fe-binding strength of the organic ligands were measured in samples from the upper water column (150 m) of the oligotrophic waters of the Canary Basin (eastern North Atlantic Ocean). Concentrations of major nutrients, phytoplankto...
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ftunivbrest:oai:HAL:hal-00635649v1 2024-02-11T10:06:46+01:00 Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin Gerringa, Loes J.A. Veldhuis, Marcel Timmermans, K.R. Sarthou, Géraldine de Baar, H. J. W. Royal Netherlands Institute for Sea Research (NIOZ) 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) NWO/NAAP grant number 85120004. 2006-12-06 https://hal.univ-brest.fr/hal-00635649 https://doi.org/10.1016/j.marchem.2006.05.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.05.004 hal-00635649 https://hal.univ-brest.fr/hal-00635649 doi:10.1016/j.marchem.2006.05.004 ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00635649 Marine Chemistry, 2006, 102 (3-4), pp.276-290. ⟨10.1016/j.marchem.2006.05.004⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2006 ftunivbrest https://doi.org/10.1016/j.marchem.2006.05.004 2024-01-23T23:36:42Z International audience Dissolved Fe and ligand concentrations and the Fe-binding strength of the organic ligands were measured in samples from the upper water column (150 m) of the oligotrophic waters of the Canary Basin (eastern North Atlantic Ocean). Concentrations of major nutrients, phytoplankton abundance and photosynthetic characteristics were also measured in the same samples. The concentrations of dissolved Fe and dissolved organic ligands were low with mean values of 0.31 ± 0.18 nM Fe and 1.79 ± 0.73 nEq of M Fe(n = 47), respectively. The conditional binding constant varied between 1019.8-1022.7 (n = 47). The largest variation with depth in the ligand concentrations (between 4.78 and 1.1 nEq of M Fe) was observed in the upper layer, above the Deep Chlorophyll Maximum (DCM located between 80 and 100 m), with high surface values in stations at 18 and 34. At the DCM where Fe was depleted, the ligand concentrations were still relatively high showing the same trend with depth as the amount of phytoplankton cells. Here 62% of the vertical variation in ligand concentrations can be explained by parameters describing phytoplankton cell abundance or biomass and orthosilicic acid concentration, which could reflect diatom growth. Ligand concentrations below the maximum of the DCM (n = 4) showed good linear positive relationships with the total phytoplankton biomass as well as with 2 out of 4 distinguished groups of phytoplankton (Synechococcus and pico-eukaryote I). In the maximum of the DCM and below this maximum the phytoplankton origin of the dissolved organic ligands of Fe is very probable. Data suggest a release of ligands by cell lysis and not by an active production. However, the origin in the surface layer is more difficult to explain. Although the amount of phytoplankton cells in the surface layer is reduced, it is still ∼ 25% of the cell concentration observed in the DCM. High concentrations of organic ligands could then be a remnant of past blooms or present production under nutrient depleted ... Article in Journal/Newspaper North Atlantic Université de Bretagne Occidentale: HAL Marine Chemistry 102 3-4 276 290 |
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Open Polar |
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Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Gerringa, Loes J.A. Veldhuis, Marcel Timmermans, K.R. Sarthou, Géraldine de Baar, H. J. W. Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Dissolved Fe and ligand concentrations and the Fe-binding strength of the organic ligands were measured in samples from the upper water column (150 m) of the oligotrophic waters of the Canary Basin (eastern North Atlantic Ocean). Concentrations of major nutrients, phytoplankton abundance and photosynthetic characteristics were also measured in the same samples. The concentrations of dissolved Fe and dissolved organic ligands were low with mean values of 0.31 ± 0.18 nM Fe and 1.79 ± 0.73 nEq of M Fe(n = 47), respectively. The conditional binding constant varied between 1019.8-1022.7 (n = 47). The largest variation with depth in the ligand concentrations (between 4.78 and 1.1 nEq of M Fe) was observed in the upper layer, above the Deep Chlorophyll Maximum (DCM located between 80 and 100 m), with high surface values in stations at 18 and 34. At the DCM where Fe was depleted, the ligand concentrations were still relatively high showing the same trend with depth as the amount of phytoplankton cells. Here 62% of the vertical variation in ligand concentrations can be explained by parameters describing phytoplankton cell abundance or biomass and orthosilicic acid concentration, which could reflect diatom growth. Ligand concentrations below the maximum of the DCM (n = 4) showed good linear positive relationships with the total phytoplankton biomass as well as with 2 out of 4 distinguished groups of phytoplankton (Synechococcus and pico-eukaryote I). In the maximum of the DCM and below this maximum the phytoplankton origin of the dissolved organic ligands of Fe is very probable. Data suggest a release of ligands by cell lysis and not by an active production. However, the origin in the surface layer is more difficult to explain. Although the amount of phytoplankton cells in the surface layer is reduced, it is still ∼ 25% of the cell concentration observed in the DCM. High concentrations of organic ligands could then be a remnant of past blooms or present production under nutrient depleted ... |
author2 |
Royal Netherlands Institute for Sea Research (NIOZ) 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) NWO/NAAP grant number 85120004. |
format |
Article in Journal/Newspaper |
author |
Gerringa, Loes J.A. Veldhuis, Marcel Timmermans, K.R. Sarthou, Géraldine de Baar, H. J. W. |
author_facet |
Gerringa, Loes J.A. Veldhuis, Marcel Timmermans, K.R. Sarthou, Géraldine de Baar, H. J. W. |
author_sort |
Gerringa, Loes J.A. |
title |
Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
title_short |
Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
title_full |
Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
title_fullStr |
Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
title_full_unstemmed |
Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
title_sort |
co-variance of dissolved fe-binding ligands with phytoplankton characteristics in the canary basin |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.univ-brest.fr/hal-00635649 https://doi.org/10.1016/j.marchem.2006.05.004 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00635649 Marine Chemistry, 2006, 102 (3-4), pp.276-290. ⟨10.1016/j.marchem.2006.05.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.05.004 hal-00635649 https://hal.univ-brest.fr/hal-00635649 doi:10.1016/j.marchem.2006.05.004 |
op_doi |
https://doi.org/10.1016/j.marchem.2006.05.004 |
container_title |
Marine Chemistry |
container_volume |
102 |
container_issue |
3-4 |
container_start_page |
276 |
op_container_end_page |
290 |
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1790604706338308096 |