Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice
Iron (Fe) has been shown to limit growth of marine phytoplankton in the Southern Ocean, regulating phytoplankton productivity and species composition, yet does not seem to limit primary productivity in Antarctic sea ice. Little is known, however, about the potential impact of other metals in control...
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crunicaliforniap:10.1525/elementa.2021.00032 2023-08-27T04:05:59+02:00 Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice Duprat, Luis Townsend, Ashley T. van der Merwe, Pier Meiners, Klaus M. Lannuzel, Delphine 2021 http://dx.doi.org/10.1525/elementa.2021.00032 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00032/484688/elementa.2021.00032.pdf en eng University of California Press http://creativecommons.org/licenses/by/4.0/ Elementa: Science of the Anthropocene volume 9, issue 1 ISSN 2325-1026 Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography journal-article 2021 crunicaliforniap https://doi.org/10.1525/elementa.2021.00032 2023-08-04T12:54:46Z Iron (Fe) has been shown to limit growth of marine phytoplankton in the Southern Ocean, regulating phytoplankton productivity and species composition, yet does not seem to limit primary productivity in Antarctic sea ice. Little is known, however, about the potential impact of other metals in controlling sea-ice algae growth. Here, we report on the distribution of dissolved and particulate cadmium (Cd), cobalt (Co), copper (Cu), manganese (Mn), nickel (Ni), and zinc (Zn) concentrations in sea-ice cores collected during 3 Antarctic expeditions off East Antarctica spanning the winter, spring, and summer seasons. Bulk sea ice was generally enriched in particulate metals but dissolved concentrations were similar to the underlying seawater. These results point toward an environment controlled by a subtle balance between thermodynamic and biological processes, where metal availability does not appear to limit sea-ice algal growth. Yet the high concentrations of dissolved Cu and Zn found in our sea-ice samples raise concern about their potential toxicity if unchelated by organic ligands. Finally, the particulate metal-to-phosphorus (P) ratios of Cu, Mn, Ni, and Zn calculated from our pack ice samples are higher than values previously reported for pelagic marine particles. However, these values were all consistently lower than the sea-ice Fe:P ratios calculated from the available literature, indicating a large accumulation of Fe relative to other metals in sea ice. We report for the first time a P-normalized sea-ice particulate metal abundance ranking of Fe >> Zn ≈ Ni ≈ Cu ≈ Mn > Co ≈ Cd. We encourage future sea-ice work to assess cellular metal quotas through existing and new approaches. Such work, together with a better understanding of the nature of ligand complexation to different metals in the sea-ice environment, would improve the evaluation of metal bioavailability, limitation, and potential toxicity to sea-ice algae. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice algae Sea ice Southern Ocean University of California Press (via Crossref) Antarctic Southern Ocean East Antarctica Elementa: Science of the Anthropocene 9 1 |
institution |
Open Polar |
collection |
University of California Press (via Crossref) |
op_collection_id |
crunicaliforniap |
language |
English |
topic |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
spellingShingle |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Duprat, Luis Townsend, Ashley T. van der Merwe, Pier Meiners, Klaus M. Lannuzel, Delphine Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
topic_facet |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography |
description |
Iron (Fe) has been shown to limit growth of marine phytoplankton in the Southern Ocean, regulating phytoplankton productivity and species composition, yet does not seem to limit primary productivity in Antarctic sea ice. Little is known, however, about the potential impact of other metals in controlling sea-ice algae growth. Here, we report on the distribution of dissolved and particulate cadmium (Cd), cobalt (Co), copper (Cu), manganese (Mn), nickel (Ni), and zinc (Zn) concentrations in sea-ice cores collected during 3 Antarctic expeditions off East Antarctica spanning the winter, spring, and summer seasons. Bulk sea ice was generally enriched in particulate metals but dissolved concentrations were similar to the underlying seawater. These results point toward an environment controlled by a subtle balance between thermodynamic and biological processes, where metal availability does not appear to limit sea-ice algal growth. Yet the high concentrations of dissolved Cu and Zn found in our sea-ice samples raise concern about their potential toxicity if unchelated by organic ligands. Finally, the particulate metal-to-phosphorus (P) ratios of Cu, Mn, Ni, and Zn calculated from our pack ice samples are higher than values previously reported for pelagic marine particles. However, these values were all consistently lower than the sea-ice Fe:P ratios calculated from the available literature, indicating a large accumulation of Fe relative to other metals in sea ice. We report for the first time a P-normalized sea-ice particulate metal abundance ranking of Fe >> Zn ≈ Ni ≈ Cu ≈ Mn > Co ≈ Cd. We encourage future sea-ice work to assess cellular metal quotas through existing and new approaches. Such work, together with a better understanding of the nature of ligand complexation to different metals in the sea-ice environment, would improve the evaluation of metal bioavailability, limitation, and potential toxicity to sea-ice algae. |
format |
Article in Journal/Newspaper |
author |
Duprat, Luis Townsend, Ashley T. van der Merwe, Pier Meiners, Klaus M. Lannuzel, Delphine |
author_facet |
Duprat, Luis Townsend, Ashley T. van der Merwe, Pier Meiners, Klaus M. Lannuzel, Delphine |
author_sort |
Duprat, Luis |
title |
Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
title_short |
Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
title_full |
Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
title_fullStr |
Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
title_full_unstemmed |
Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
title_sort |
spatial and seasonal distribution of dissolved and particulate bioactive metals in antarctic sea ice |
publisher |
University of California Press |
publishDate |
2021 |
url |
http://dx.doi.org/10.1525/elementa.2021.00032 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2021.00032/484688/elementa.2021.00032.pdf |
geographic |
Antarctic Southern Ocean East Antarctica |
geographic_facet |
Antarctic Southern Ocean East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice algae Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice algae Sea ice Southern Ocean |
op_source |
Elementa: Science of the Anthropocene volume 9, issue 1 ISSN 2325-1026 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1525/elementa.2021.00032 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1775346712529862656 |