Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities
Cobalt (Co) is a scarce but essential micronutrient for marine plankton in the Southern Ocean and coastal Antarctic seas, where dissolved cobalt (dCo) concentrations can be extremely low. This study presents total dCo and labile dCo distributions measured via shipboard voltammetry in the Amundsen Se...
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2023
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ftdoajarticles:oai:doaj.org/article:ffed67fb5d53423493d0fb219ce3eced 2023-11-05T03:31:59+01:00 Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities R. J. Chmiel R. M. Kell D. Rao D. M. Moran G. R. DiTullio M. A. Saito 2023-10-01T00:00:00Z https://doi.org/10.5194/bg-20-3997-2023 https://doaj.org/article/ffed67fb5d53423493d0fb219ce3eced EN eng Copernicus Publications https://bg.copernicus.org/articles/20/3997/2023/bg-20-3997-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-3997-2023 1726-4170 1726-4189 https://doaj.org/article/ffed67fb5d53423493d0fb219ce3eced Biogeosciences, Vol 20, Pp 3997-4027 (2023) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/bg-20-3997-2023 2023-10-08T00:37:11Z Cobalt (Co) is a scarce but essential micronutrient for marine plankton in the Southern Ocean and coastal Antarctic seas, where dissolved cobalt (dCo) concentrations can be extremely low. This study presents total dCo and labile dCo distributions measured via shipboard voltammetry in the Amundsen Sea, the Ross Sea and Terra Nova Bay during the CICLOPS (Cobalamin and Iron Co-Limitation of Phytoplankton Species) expedition. A significantly smaller dCo inventory was observed during the 2017/2018 CICLOPS expedition compared to two 2005/2006 expeditions to the Ross Sea conducted over a decade earlier. The dCo inventory loss ( ∼ 10–20 pM) was present in both the surface and deep ocean and was attributed to the loss of labile dCo, resulting in the near-complete complexation of dCo by strong ligands in the photic zone. A changing dCo inventory in Antarctic coastal seas could be driven by the alleviation of iron (Fe) limitation in coastal areas, where the flux of Fe-rich sediments from melting ice shelves and deep sediment resuspension may have shifted the region towards vitamin B 12 and/or zinc (Zn) limitation, both of which are likely to increase the demand for Co among marine plankton. High demand for Zn by phytoplankton can result in increased Co and cadmium (Cd) uptake because these metals often share the same metal uptake transporters. This study compared the magnitudes and ratios of Zn, Cd and Co uptake ( ρ ) across upper-ocean profiles and the observed order-of-magnitude uptake trends ( ρ Zn > ρ Cd > ρ Co) that paralleled the trace metal concentrations in seawater. High rates of Co and Zn uptake were observed throughout the region, and the speciation of available Co and Zn appeared to influence trends in dissolved metal : phosphate stoichiometry and uptake rates over depth. Multi-year loss of the dCo inventory throughout the water column may be explained by an increase in Co uptake into particulate organic matter and subsequently an increased flux of Co into sediments via sinking and burial. This ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Shelves Ross Sea Southern Ocean Directory of Open Access Journals: DOAJ Articles Biogeosciences 20 19 3997 4027 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 R. J. Chmiel R. M. Kell D. Rao D. M. Moran G. R. DiTullio M. A. Saito Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Cobalt (Co) is a scarce but essential micronutrient for marine plankton in the Southern Ocean and coastal Antarctic seas, where dissolved cobalt (dCo) concentrations can be extremely low. This study presents total dCo and labile dCo distributions measured via shipboard voltammetry in the Amundsen Sea, the Ross Sea and Terra Nova Bay during the CICLOPS (Cobalamin and Iron Co-Limitation of Phytoplankton Species) expedition. A significantly smaller dCo inventory was observed during the 2017/2018 CICLOPS expedition compared to two 2005/2006 expeditions to the Ross Sea conducted over a decade earlier. The dCo inventory loss ( ∼ 10–20 pM) was present in both the surface and deep ocean and was attributed to the loss of labile dCo, resulting in the near-complete complexation of dCo by strong ligands in the photic zone. A changing dCo inventory in Antarctic coastal seas could be driven by the alleviation of iron (Fe) limitation in coastal areas, where the flux of Fe-rich sediments from melting ice shelves and deep sediment resuspension may have shifted the region towards vitamin B 12 and/or zinc (Zn) limitation, both of which are likely to increase the demand for Co among marine plankton. High demand for Zn by phytoplankton can result in increased Co and cadmium (Cd) uptake because these metals often share the same metal uptake transporters. This study compared the magnitudes and ratios of Zn, Cd and Co uptake ( ρ ) across upper-ocean profiles and the observed order-of-magnitude uptake trends ( ρ Zn > ρ Cd > ρ Co) that paralleled the trace metal concentrations in seawater. High rates of Co and Zn uptake were observed throughout the region, and the speciation of available Co and Zn appeared to influence trends in dissolved metal : phosphate stoichiometry and uptake rates over depth. Multi-year loss of the dCo inventory throughout the water column may be explained by an increase in Co uptake into particulate organic matter and subsequently an increased flux of Co into sediments via sinking and burial. This ... |
format |
Article in Journal/Newspaper |
author |
R. J. Chmiel R. M. Kell D. Rao D. M. Moran G. R. DiTullio M. A. Saito |
author_facet |
R. J. Chmiel R. M. Kell D. Rao D. M. Moran G. R. DiTullio M. A. Saito |
author_sort |
R. J. Chmiel |
title |
Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
title_short |
Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
title_full |
Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
title_fullStr |
Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
title_full_unstemmed |
Low cobalt inventories in the Amundsen and Ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
title_sort |
low cobalt inventories in the amundsen and ross seas driven by high demand for labile cobalt uptake among native phytoplankton communities |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/bg-20-3997-2023 https://doaj.org/article/ffed67fb5d53423493d0fb219ce3eced |
genre |
Amundsen Sea Antarc* Antarctic Ice Shelves Ross Sea Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Shelves Ross Sea Southern Ocean |
op_source |
Biogeosciences, Vol 20, Pp 3997-4027 (2023) |
op_relation |
https://bg.copernicus.org/articles/20/3997/2023/bg-20-3997-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-3997-2023 1726-4170 1726-4189 https://doaj.org/article/ffed67fb5d53423493d0fb219ce3eced |
op_doi |
https://doi.org/10.5194/bg-20-3997-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
19 |
container_start_page |
3997 |
op_container_end_page |
4027 |
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1781692436151533568 |