Spatial and seasonal distribution of dissolved and particulate bioactive metals in Antarctic sea ice
Bibliographic Data
| ID | 19568435 |
|---|---|
| Authors | Luis Duprat (0000-0003-1536-9559, University of Tasmania), Ashley T Townsend (0000-0002-2972-2678, University of Tasmania), Pier van der Merwe (0000-0002-7428-8030, University of Tasmania), Klaus M Meiners (0000-0001-7118-9136, Australian Antarctic Division), Delphine Lannuzel (0000-0001-6154-1837, University of Tasmania) |
| Year | 2021 |
| Volume | 9 |
| Issue | 1 |
| Publication date | 2021-11-09 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Elementa Science of the Anthropocene (JOURNAL) |
| Journal identifiers | ISSN: 2325-1026 • E-ISSN: 2325-1026 |
| Publisher | University of California Press (PUBLISHER • US) |
| DOI | 10.1525/elementa.2021.00032 |
| OpenAlex | W3213750901 |
| Language | EN |
| References cited | 125 |
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
Cadmium · Nutrient · Particulates · Phytoplankton · Sea ice · Seawater · Chemistry · Environmental Science · Marine and coastal ecosystems · Mercury impact and mitigation studies · Per- and polyfluoroalkyl substances research · Environmental Chemistry · Geology · Oceanography
| Citation velocity | historical |
|---|---|
| Highly cited | No |