Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling
Cd and phosphate concentrations in seawater are closely related, suggesting that Cd distributions, like those of PO 4 , are controlled by algal uptake and regeneration. But the factors that control Cd levels in phytoplankton and their influence on oceanic Cd versus PO 4 relationships are poorly know...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2000.45.7.1501 2024-10-06T13:52:59+00:00 Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling Sunda, William G. Huntsman, Susan A. 2000 http://dx.doi.org/10.4319/lo.2000.45.7.1501 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2000.45.7.1501 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2000.45.7.1501 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 45, issue 7, page 1501-1516 ISSN 0024-3590 1939-5590 journal-article 2000 crwiley https://doi.org/10.4319/lo.2000.45.7.1501 2024-09-11T04:15:30Z Cd and phosphate concentrations in seawater are closely related, suggesting that Cd distributions, like those of PO 4 , are controlled by algal uptake and regeneration. But the factors that control Cd levels in phytoplankton and their influence on oceanic Cd versus PO 4 relationships are poorly known. We examined the effect of important controlling factors (free ion concentrations of Cd, Zn, and Mn and Fe limitation of growth rate) on Cd accumulation by an oceanic diatom ( Thalassiosira oceanica ). More limited comparative experiments were also conducted with a coastal diatom ( T. weissflogii ) and an oceanic coccolithophore ( Emiliania huxleyi ). Cellular Cd:C ratios increased with increasing Cd ion concentrations and decreasing Zn ion concentrations in all species and with decreasing ionic Mn in the diatoms. The effects of Mn and Zn apparently are related to the uptake of Cd by the cells' Mn and Cd/Co transport systems, which are under negative feedback regulation by cellular Mn and Zn. Cd:C ratios were determined in the oceanic diatom as functions of free ion concentrations of Cd, Zn, and Mn over the oceanic range of these metal ions. The data were combined with estimates of free ion concentrations of these metals in seawater to construct models of Cd:C and Cd:P ratios in oceanic phytoplankton. The modeled Cd:P ratios showed good agreement with slopes of Cd versus P relationships in different oceanic regimes. The models suggest that the high Cd versus phosphate slopes found in iron‐depleted waters of the Southern Ocean and subarctic Pacific result from unusually high levels of zinc depletion in these waters. The resulting low zinc ion concentrations induce high levels of Cd uptake by phytoplankton, yielding high algal Cd:P ratios. The heavy depletion of zinc may be linked to elevated Zn:C and Zn:P ratios in iron‐limited diatoms, as observed in experiments we conducted with T. oceanica . Article in Journal/Newspaper Southern Ocean Subarctic Wiley Online Library Pacific Southern Ocean Limnology and Oceanography 45 7 1501 1516 |
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English |
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Cd and phosphate concentrations in seawater are closely related, suggesting that Cd distributions, like those of PO 4 , are controlled by algal uptake and regeneration. But the factors that control Cd levels in phytoplankton and their influence on oceanic Cd versus PO 4 relationships are poorly known. We examined the effect of important controlling factors (free ion concentrations of Cd, Zn, and Mn and Fe limitation of growth rate) on Cd accumulation by an oceanic diatom ( Thalassiosira oceanica ). More limited comparative experiments were also conducted with a coastal diatom ( T. weissflogii ) and an oceanic coccolithophore ( Emiliania huxleyi ). Cellular Cd:C ratios increased with increasing Cd ion concentrations and decreasing Zn ion concentrations in all species and with decreasing ionic Mn in the diatoms. The effects of Mn and Zn apparently are related to the uptake of Cd by the cells' Mn and Cd/Co transport systems, which are under negative feedback regulation by cellular Mn and Zn. Cd:C ratios were determined in the oceanic diatom as functions of free ion concentrations of Cd, Zn, and Mn over the oceanic range of these metal ions. The data were combined with estimates of free ion concentrations of these metals in seawater to construct models of Cd:C and Cd:P ratios in oceanic phytoplankton. The modeled Cd:P ratios showed good agreement with slopes of Cd versus P relationships in different oceanic regimes. The models suggest that the high Cd versus phosphate slopes found in iron‐depleted waters of the Southern Ocean and subarctic Pacific result from unusually high levels of zinc depletion in these waters. The resulting low zinc ion concentrations induce high levels of Cd uptake by phytoplankton, yielding high algal Cd:P ratios. The heavy depletion of zinc may be linked to elevated Zn:C and Zn:P ratios in iron‐limited diatoms, as observed in experiments we conducted with T. oceanica . |
format |
Article in Journal/Newspaper |
author |
Sunda, William G. Huntsman, Susan A. |
spellingShingle |
Sunda, William G. Huntsman, Susan A. Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
author_facet |
Sunda, William G. Huntsman, Susan A. |
author_sort |
Sunda, William G. |
title |
Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
title_short |
Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
title_full |
Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
title_fullStr |
Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
title_full_unstemmed |
Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling |
title_sort |
effect of zn, mn, and fe on cd accumulation in phytoplankton: implications for oceanic cd cycling |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.4319/lo.2000.45.7.1501 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2000.45.7.1501 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2000.45.7.1501 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean Subarctic |
genre_facet |
Southern Ocean Subarctic |
op_source |
Limnology and Oceanography volume 45, issue 7, page 1501-1516 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2000.45.7.1501 |
container_title |
Limnology and Oceanography |
container_volume |
45 |
container_issue |
7 |
container_start_page |
1501 |
op_container_end_page |
1516 |
_version_ |
1812181603956293632 |