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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ftunivtasecite:oai:ecite.utas.edu.au:151388 2023-05-15T13:42:40+02:00 Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice Duprat, L Townsend, AT van der Merwe, P Meiners, KM Lannuzel, D 2021 application/pdf https://doi.org/10.1525/elementa.2021.00032 http://ecite.utas.edu.au/151388 en eng University of California Press Journals Division http://ecite.utas.edu.au/151388/1/151388 - Spatial and seasonal distribution of dissolved and particulate bioactive.pdf http://dx.doi.org/10.1525/elementa.2021.00032 Duprat, L and Townsend, AT and van der Merwe, P and Meiners, KM and Lannuzel, D, Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice, Elementa, 9, (1) Article 00032. ISSN 2325-1026 (2021) [Refereed Article] http://ecite.utas.edu.au/151388 Earth Sciences Oceanography Chemical oceanography Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1525/elementa.2021.00032 2022-08-29T22:18:44Z 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 eCite UTAS (University of Tasmania) Antarctic East Antarctica Southern Ocean Elementa: Science of the Anthropocene 9 1 |
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Earth Sciences Oceanography Chemical oceanography |
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Earth Sciences Oceanography Chemical oceanography Duprat, L Townsend, AT van der Merwe, P Meiners, KM Lannuzel, D Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice |
topic_facet |
Earth Sciences Oceanography Chemical 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, L Townsend, AT van der Merwe, P Meiners, KM Lannuzel, D |
author_facet |
Duprat, L Townsend, AT van der Merwe, P Meiners, KM Lannuzel, D |
author_sort |
Duprat, L |
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 Journals Division |
publishDate |
2021 |
url |
https://doi.org/10.1525/elementa.2021.00032 http://ecite.utas.edu.au/151388 |
geographic |
Antarctic East Antarctica Southern Ocean |
geographic_facet |
Antarctic East Antarctica Southern Ocean |
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_relation |
http://ecite.utas.edu.au/151388/1/151388 - Spatial and seasonal distribution of dissolved and particulate bioactive.pdf http://dx.doi.org/10.1525/elementa.2021.00032 Duprat, L and Townsend, AT and van der Merwe, P and Meiners, KM and Lannuzel, D, Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice, Elementa, 9, (1) Article 00032. ISSN 2325-1026 (2021) [Refereed Article] http://ecite.utas.edu.au/151388 |
op_doi |
https://doi.org/10.1525/elementa.2021.00032 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
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1766171304455569408 |