DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf
The availability of iron (Fe) to marine microbial communities is enhanced through complexation by ligands. In Fe limited environments, measuring the distribution and identifying the likely sources of ligands is therefore central to understanding the drivers of marine productivity. Antarctic coastal...
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Online Access: | https://doi.org/10.3389/fmars.2022.948772.s001 https://figshare.com/articles/dataset/DataSheet_1_Identifying_potential_sources_of_iron-binding_ligands_in_coastal_Antarctic_environments_and_the_wider_Southern_Ocean_pdf/20429007 |
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ftfrontimediafig:oai:figshare.com:article/20429007 2024-09-15T17:43:10+00:00 DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf Abigail J.R. Smith Talitha Nelson Lavenia Ratnarajah Cristina Genovese Karen Westwood Thomas M. Holmes Matthew Corkill Ashley T. Townsend Elanor Bell Kathrin Wuttig Delphine Lannuzel 2022-08-04T04:25:48Z https://doi.org/10.3389/fmars.2022.948772.s001 https://figshare.com/articles/dataset/DataSheet_1_Identifying_potential_sources_of_iron-binding_ligands_in_coastal_Antarctic_environments_and_the_wider_Southern_Ocean_pdf/20429007 unknown doi:10.3389/fmars.2022.948772.s001 https://figshare.com/articles/dataset/DataSheet_1_Identifying_potential_sources_of_iron-binding_ligands_in_coastal_Antarctic_environments_and_the_wider_Southern_Ocean_pdf/20429007 CC BY 4.0 Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Fe availability microbial productivity benthic nepheloid layers SOLt collection complexation Dataset 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.948772.s001 2024-08-19T06:20:02Z The availability of iron (Fe) to marine microbial communities is enhanced through complexation by ligands. In Fe limited environments, measuring the distribution and identifying the likely sources of ligands is therefore central to understanding the drivers of marine productivity. Antarctic coastal marine environments support highly productive ecosystems and are influenced by numerous sources of ligands, the magnitude of which varies both spatially and seasonally. Using competitive ligand exchange adsorptive cathodic stripping voltammetry (CLE-AdCSV) with 2-(2-thiazolylazo)-p-cresol (TAC) as a competing artificial ligand, this study investigates Fe-binding ligands (FeL) across the continental shelf break in the Mertz Glacier Region, East Antarctica (64 - 67°S; 138 - 154°E) during austral summer of 2019. The average FeL concentration was 0.86 ± 0.5 nM Eq Fe, with strong conditional stability constants (Log K FeL ) averaging 23.1 ± 1.0. The strongest binding ligands were observed in modified circumpolar deep water (CDW), thought to be linked to bacterial Fe remineralisation and potential siderophore release. High proportions of excess unbound ligands (L’) were observed in surface waters, as a result of phytoplankton Fe uptake in the mixed layer and euphotic zone. However, FeL and L’ concentrations were greater at depth, suggesting ligands were supplied with dissolved Fe from upwelled CDW and particle remineralisation in benthic nepheloid layers over the shelf. Recent sea-ice melt appeared to support bacterial production in areas where Fe and ligands were exhausted. This study is included within our newly compiled Southern Ocean Ligand (SOLt) Collection, a database of publicly available Fe-binding ligand surveys performed south of 50°S. A review of the SOLt Collection brings attention to the paucity of ligand data collected along the East Antarctic coast and the difficulties in pinpointing sources of Fe and ligands in coastal environments. Elucidating poorly understood ligand sources is essential to predicting ... Dataset Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice Southern Ocean Frontiers: Figshare |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Fe availability microbial productivity benthic nepheloid layers SOLt collection complexation |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Fe availability microbial productivity benthic nepheloid layers SOLt collection complexation Abigail J.R. Smith Talitha Nelson Lavenia Ratnarajah Cristina Genovese Karen Westwood Thomas M. Holmes Matthew Corkill Ashley T. Townsend Elanor Bell Kathrin Wuttig Delphine Lannuzel DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Fe availability microbial productivity benthic nepheloid layers SOLt collection complexation |
description |
The availability of iron (Fe) to marine microbial communities is enhanced through complexation by ligands. In Fe limited environments, measuring the distribution and identifying the likely sources of ligands is therefore central to understanding the drivers of marine productivity. Antarctic coastal marine environments support highly productive ecosystems and are influenced by numerous sources of ligands, the magnitude of which varies both spatially and seasonally. Using competitive ligand exchange adsorptive cathodic stripping voltammetry (CLE-AdCSV) with 2-(2-thiazolylazo)-p-cresol (TAC) as a competing artificial ligand, this study investigates Fe-binding ligands (FeL) across the continental shelf break in the Mertz Glacier Region, East Antarctica (64 - 67°S; 138 - 154°E) during austral summer of 2019. The average FeL concentration was 0.86 ± 0.5 nM Eq Fe, with strong conditional stability constants (Log K FeL ) averaging 23.1 ± 1.0. The strongest binding ligands were observed in modified circumpolar deep water (CDW), thought to be linked to bacterial Fe remineralisation and potential siderophore release. High proportions of excess unbound ligands (L’) were observed in surface waters, as a result of phytoplankton Fe uptake in the mixed layer and euphotic zone. However, FeL and L’ concentrations were greater at depth, suggesting ligands were supplied with dissolved Fe from upwelled CDW and particle remineralisation in benthic nepheloid layers over the shelf. Recent sea-ice melt appeared to support bacterial production in areas where Fe and ligands were exhausted. This study is included within our newly compiled Southern Ocean Ligand (SOLt) Collection, a database of publicly available Fe-binding ligand surveys performed south of 50°S. A review of the SOLt Collection brings attention to the paucity of ligand data collected along the East Antarctic coast and the difficulties in pinpointing sources of Fe and ligands in coastal environments. Elucidating poorly understood ligand sources is essential to predicting ... |
format |
Dataset |
author |
Abigail J.R. Smith Talitha Nelson Lavenia Ratnarajah Cristina Genovese Karen Westwood Thomas M. Holmes Matthew Corkill Ashley T. Townsend Elanor Bell Kathrin Wuttig Delphine Lannuzel |
author_facet |
Abigail J.R. Smith Talitha Nelson Lavenia Ratnarajah Cristina Genovese Karen Westwood Thomas M. Holmes Matthew Corkill Ashley T. Townsend Elanor Bell Kathrin Wuttig Delphine Lannuzel |
author_sort |
Abigail J.R. Smith |
title |
DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
title_short |
DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
title_full |
DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
title_fullStr |
DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
title_full_unstemmed |
DataSheet_1_Identifying potential sources of iron-binding ligands in coastal Antarctic environments and the wider Southern Ocean.pdf |
title_sort |
datasheet_1_identifying potential sources of iron-binding ligands in coastal antarctic environments and the wider southern ocean.pdf |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.948772.s001 https://figshare.com/articles/dataset/DataSheet_1_Identifying_potential_sources_of_iron-binding_ligands_in_coastal_Antarctic_environments_and_the_wider_Southern_Ocean_pdf/20429007 |
genre |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice Southern Ocean |
op_relation |
doi:10.3389/fmars.2022.948772.s001 https://figshare.com/articles/dataset/DataSheet_1_Identifying_potential_sources_of_iron-binding_ligands_in_coastal_Antarctic_environments_and_the_wider_Southern_Ocean_pdf/20429007 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/fmars.2022.948772.s001 |
_version_ |
1810490027294064640 |