Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean

The evolution of dissolved iron (Fe) and copper (Cu) speciation was followed through a simulated spring bloom event in a 15-day incubation experiment of natural seawater collected during austral winter from high macronutrient high Fe waters of Bransfield Strait in the Southern Ocean. The incubation...

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Bibliographic Details
Published in:Marine Chemistry
Main Authors: Buck, Kristen N., Selph, Karen, Barbeau, Katherine
Format: Article in Journal/Newspaper
Language:unknown
Published: Digital Commons @ University of South Florida 2010
Subjects:
Chemical speciation
Iron
Copper
Seawater
Incubation
Southern Ocean
Life Sciences
Antarctic
Antarctic Peninsula
Austral
Bransfield Strait
Antarc*
Online Access:https://digitalcommons.usf.edu/msc_facpub/613
https://doi.org/10.1016/j.marchem.2010.06.002
id ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-1613
record_format openpolar
spelling ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-1613 2023-07-30T03:56:47+02:00 Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean Buck, Kristen N. Selph, Karen Barbeau, Katherine 2010-10-01T07:00:00Z https://digitalcommons.usf.edu/msc_facpub/613 https://doi.org/10.1016/j.marchem.2010.06.002 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/613 doi:10.1016/j.marchem.2010.06.002 https://doi.org/10.1016/j.marchem.2010.06.002 Marine Science Faculty Publications Chemical speciation Iron Copper Seawater Incubation Southern Ocean Life Sciences article 2010 ftusouthflorida https://doi.org/10.1016/j.marchem.2010.06.002 2023-07-13T20:45:14Z The evolution of dissolved iron (Fe) and copper (Cu) speciation was followed through a simulated spring bloom event in a 15-day incubation experiment of natural seawater collected during austral winter from high macronutrient high Fe waters of Bransfield Strait in the Southern Ocean. The incubation experiment included unamended bottles as well as Fe additions using the stable isotope of Fe, 57Fe, as inorganic (57FeCl3) and organic (57Fe-aerobactin, 57Fe-desferrioxamine B) amendments. Exposure to summer light conditions resulted in substantial growth for all treatments, mimicking the initiation of a spring bloom. The addition of Fe resulted in a 30% increase in phytoplankton biomass over unamended controls by day 15, indicating that the unamended waters became Fe limited despite initially elevated dissolved Fe concentrations. Dissolved Cu and Cu speciation remained largely unchanged for all treatments of the incubation, with Cu speciation dominated by exceedingly strong Cu-binding ligands (log KCuL1,Cu2+cond ~ 16) and low resultant Cu2+ concentrations (10− 16.3 ± 0.3 mol L− 1). In only the unamended light bottles, strong Fe-binding ligands were produced over the course of the experiment. The observed production of strong Fe-binding ligands in the control bottles that became Fe-limited supports the important role of biologically produced siderophore-type natural ligands in the marine Fe cycle. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bransfield Strait Southern Ocean University of South Florida St. Petersburg: Digital USFSP Antarctic Antarctic Peninsula Austral Bransfield Strait Southern Ocean Marine Chemistry 122 1-4 148 159
institution Open Polar
collection University of South Florida St. Petersburg: Digital USFSP
op_collection_id ftusouthflorida
language unknown
topic Chemical speciation
Iron
Copper
Seawater
Incubation
Southern Ocean
Life Sciences
spellingShingle Chemical speciation
Iron
Copper
Seawater
Incubation
Southern Ocean
Life Sciences
Buck, Kristen N.
Selph, Karen
Barbeau, Katherine
Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
topic_facet Chemical speciation
Iron
Copper
Seawater
Incubation
Southern Ocean
Life Sciences
description The evolution of dissolved iron (Fe) and copper (Cu) speciation was followed through a simulated spring bloom event in a 15-day incubation experiment of natural seawater collected during austral winter from high macronutrient high Fe waters of Bransfield Strait in the Southern Ocean. The incubation experiment included unamended bottles as well as Fe additions using the stable isotope of Fe, 57Fe, as inorganic (57FeCl3) and organic (57Fe-aerobactin, 57Fe-desferrioxamine B) amendments. Exposure to summer light conditions resulted in substantial growth for all treatments, mimicking the initiation of a spring bloom. The addition of Fe resulted in a 30% increase in phytoplankton biomass over unamended controls by day 15, indicating that the unamended waters became Fe limited despite initially elevated dissolved Fe concentrations. Dissolved Cu and Cu speciation remained largely unchanged for all treatments of the incubation, with Cu speciation dominated by exceedingly strong Cu-binding ligands (log KCuL1,Cu2+cond ~ 16) and low resultant Cu2+ concentrations (10− 16.3 ± 0.3 mol L− 1). In only the unamended light bottles, strong Fe-binding ligands were produced over the course of the experiment. The observed production of strong Fe-binding ligands in the control bottles that became Fe-limited supports the important role of biologically produced siderophore-type natural ligands in the marine Fe cycle.
format Article in Journal/Newspaper
author Buck, Kristen N.
Selph, Karen
Barbeau, Katherine
author_facet Buck, Kristen N.
Selph, Karen
Barbeau, Katherine
author_sort Buck, Kristen N.
title Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
title_short Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
title_full Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
title_fullStr Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
title_full_unstemmed Iron-binding Ligand Production and Copper Speciation in an Incubation Experiment of Antarctic Peninsula Shelf Waters From the Bransfield Strait, Southern Ocean
title_sort iron-binding ligand production and copper speciation in an incubation experiment of antarctic peninsula shelf waters from the bransfield strait, southern ocean
publisher Digital Commons @ University of South Florida
publishDate 2010
url https://digitalcommons.usf.edu/msc_facpub/613
https://doi.org/10.1016/j.marchem.2010.06.002
geographic Antarctic
Antarctic Peninsula
Austral
Bransfield Strait
Southern Ocean
geographic_facet Antarctic
Antarctic Peninsula
Austral
Bransfield Strait
Southern Ocean
genre Antarc*
Antarctic
Antarctic Peninsula
Bransfield Strait
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Bransfield Strait
Southern Ocean
op_source Marine Science Faculty Publications
op_relation https://digitalcommons.usf.edu/msc_facpub/613
doi:10.1016/j.marchem.2010.06.002
https://doi.org/10.1016/j.marchem.2010.06.002
op_doi https://doi.org/10.1016/j.marchem.2010.06.002
container_title Marine Chemistry
container_volume 122
container_issue 1-4
container_start_page 148
op_container_end_page 159
_version_ 1772814609805213696

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