M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol
There is considerable interest in the biogeochemical cycling of cadmium (Cd) and phosphate (PO4) in surface waters, driven in part by the ongoing development of a paleonutrient proxy that utilizes Cd preserved in fossil planktonic foraminifera to determine past PO4 utilization efficiencies in ocean...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.419.6663 2023-05-15T13:34:16+02:00 M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol Jay T. Cullen Zanna Chase Kenneth H. Coale Steve E. Fitzwater Robert M. Sherrell The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.6663 http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.6663 http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf text ftciteseerx 2016-01-08T03:53:34Z There is considerable interest in the biogeochemical cycling of cadmium (Cd) and phosphate (PO4) in surface waters, driven in part by the ongoing development of a paleonutrient proxy that utilizes Cd preserved in fossil planktonic foraminifera to determine past PO4 utilization efficiencies in ocean surface waters. The present article reports the results of a field study into the effects of Fe limitation on the Cd: P composition of natural assemblages of marine phytoplankton in the Antarctic Zone of the Pacific sector of the Southern Ocean. Iron enrichment to shipboard incubation bottles led to increases in community growth rate and final biomass. After 10.7 d of incubation, the climax community was dominated by large diatoms of the genus Fragillariopsis, Pseudonitzschia, and Nitzschia. Direct measurements of phytoplankton metal: P ratios from controlled shipboard experiments indicate that Cd: P, Co: P, and Zn: P ratios decreased from control values with increasing initial dissolved Fe concentrations in the incubation bottles, by factors of �2–10 at highest Fe additions. We suggest that the effect of Fe limitation on resident diatoms is to decrease growth rate, leading to elevated cellular Cd content. The dissolved Cd: P ratio in iron-limited surface waters of the Southern Ocean may, therefore, respond to the supply of Fe to the resident phytoplankton community, which has implications for the developing paleonutrient proxy. We suggest that the biological uptake of Cd and P is independent of the dissolved Cd: PO4 ratio. As a consequence, the results argue Text Antarc* Antarctic Planktonic foraminifera Southern Ocean Unknown Antarctic Pacific Southern Ocean The Antarctic |
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English |
description |
There is considerable interest in the biogeochemical cycling of cadmium (Cd) and phosphate (PO4) in surface waters, driven in part by the ongoing development of a paleonutrient proxy that utilizes Cd preserved in fossil planktonic foraminifera to determine past PO4 utilization efficiencies in ocean surface waters. The present article reports the results of a field study into the effects of Fe limitation on the Cd: P composition of natural assemblages of marine phytoplankton in the Antarctic Zone of the Pacific sector of the Southern Ocean. Iron enrichment to shipboard incubation bottles led to increases in community growth rate and final biomass. After 10.7 d of incubation, the climax community was dominated by large diatoms of the genus Fragillariopsis, Pseudonitzschia, and Nitzschia. Direct measurements of phytoplankton metal: P ratios from controlled shipboard experiments indicate that Cd: P, Co: P, and Zn: P ratios decreased from control values with increasing initial dissolved Fe concentrations in the incubation bottles, by factors of �2–10 at highest Fe additions. We suggest that the effect of Fe limitation on resident diatoms is to decrease growth rate, leading to elevated cellular Cd content. The dissolved Cd: P ratio in iron-limited surface waters of the Southern Ocean may, therefore, respond to the supply of Fe to the resident phytoplankton community, which has implications for the developing paleonutrient proxy. We suggest that the biological uptake of Cd and P is independent of the dissolved Cd: PO4 ratio. As a consequence, the results argue |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jay T. Cullen Zanna Chase Kenneth H. Coale Steve E. Fitzwater Robert M. Sherrell |
spellingShingle |
Jay T. Cullen Zanna Chase Kenneth H. Coale Steve E. Fitzwater Robert M. Sherrell M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
author_facet |
Jay T. Cullen Zanna Chase Kenneth H. Coale Steve E. Fitzwater Robert M. Sherrell |
author_sort |
Jay T. Cullen |
title |
M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
title_short |
M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
title_full |
M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
title_fullStr |
M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
title_full_unstemmed |
M.: Effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the Southern Ocean, Limnol |
title_sort |
m.: effect of iron limitation on the cadmium to phosphorus ratio of natural phytoplankton assemblages from the southern ocean, limnol |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.6663 http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
op_source |
http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.6663 http://www.aslo.org/lo/toc/vol_48/issue_3/1079.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766051187557138432 |