Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin
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 photosy...
Published in: | Marine Chemistry |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2006
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Online Access: | https://hdl.handle.net/11370/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://research.rug.nl/en/publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://doi.org/10.1016/j.marchem.2006.05.004 https://pure.rug.nl/ws/files/6701457/2006MarChemGerringa.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 2024-09-15T18:24:26+00:00 Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin Gerringa, L. J. A. Veldhuis, M. J. W. Timmermans, K. R. Sarthou, G. de Baar, H. J. W. 2006-12-05 application/pdf https://hdl.handle.net/11370/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://research.rug.nl/en/publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://doi.org/10.1016/j.marchem.2006.05.004 https://pure.rug.nl/ws/files/6701457/2006MarChemGerringa.pdf eng eng https://research.rug.nl/en/publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 info:eu-repo/semantics/openAccess Gerringa , L J A , Veldhuis , M J W , Timmermans , K R , Sarthou , G & de Baar , H J W 2006 , ' Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin ' , Marine Chemistry , vol. 102 , no. 3-4 , pp. 276-290 . https://doi.org/10.1016/j.marchem.2006.05.004 EQUATORIAL PACIFIC-OCEAN NATURAL ORGANIC-LIGANDS CATHODIC STRIPPING VOLTAMMETRY SOUTHERN-OCEAN ATLANTIC-OCEAN MARINE-PHYTOPLANKTON SIDEROPHORE PRODUCTION DIATOM THALASSIOSIRA IRON AVAILABILITY GROWTH-RATES article 2006 ftunigroningenpu https://doi.org/10.1016/j.marchem.2006.05.004 2024-07-01T14:49:22Z 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 10(19.8)-10(22.7) (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 in), 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 similar to 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 conditions. Input ... Article in Journal/Newspaper North Atlantic Southern Ocean University of Groningen research database Marine Chemistry 102 3-4 276 290 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
EQUATORIAL PACIFIC-OCEAN NATURAL ORGANIC-LIGANDS CATHODIC STRIPPING VOLTAMMETRY SOUTHERN-OCEAN ATLANTIC-OCEAN MARINE-PHYTOPLANKTON SIDEROPHORE PRODUCTION DIATOM THALASSIOSIRA IRON AVAILABILITY GROWTH-RATES |
spellingShingle |
EQUATORIAL PACIFIC-OCEAN NATURAL ORGANIC-LIGANDS CATHODIC STRIPPING VOLTAMMETRY SOUTHERN-OCEAN ATLANTIC-OCEAN MARINE-PHYTOPLANKTON SIDEROPHORE PRODUCTION DIATOM THALASSIOSIRA IRON AVAILABILITY GROWTH-RATES Gerringa, L. J. A. Veldhuis, M. J. W. Timmermans, K. R. Sarthou, G. de Baar, H. J. W. Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin |
topic_facet |
EQUATORIAL PACIFIC-OCEAN NATURAL ORGANIC-LIGANDS CATHODIC STRIPPING VOLTAMMETRY SOUTHERN-OCEAN ATLANTIC-OCEAN MARINE-PHYTOPLANKTON SIDEROPHORE PRODUCTION DIATOM THALASSIOSIRA IRON AVAILABILITY GROWTH-RATES |
description |
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 10(19.8)-10(22.7) (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 in), 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 similar to 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 conditions. Input ... |
format |
Article in Journal/Newspaper |
author |
Gerringa, L. J. A. Veldhuis, M. J. W. Timmermans, K. R. Sarthou, G. de Baar, H. J. W. |
author_facet |
Gerringa, L. J. A. Veldhuis, M. J. W. Timmermans, K. R. Sarthou, G. de Baar, H. J. W. |
author_sort |
Gerringa, L. 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 |
publishDate |
2006 |
url |
https://hdl.handle.net/11370/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://research.rug.nl/en/publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 https://doi.org/10.1016/j.marchem.2006.05.004 https://pure.rug.nl/ws/files/6701457/2006MarChemGerringa.pdf |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Gerringa , L J A , Veldhuis , M J W , Timmermans , K R , Sarthou , G & de Baar , H J W 2006 , ' Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin ' , Marine Chemistry , vol. 102 , no. 3-4 , pp. 276-290 . https://doi.org/10.1016/j.marchem.2006.05.004 |
op_relation |
https://research.rug.nl/en/publications/ec3d741b-f4c2-4a27-81cf-e9ad2997d5a1 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1810464780937330688 |