Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea
Primary production in the Ross Sea, one of the most productive areas in the Southern Ocean, has previously been shown to be seasonally limited by iron. In two of three bottle incubation experiments conducted in the austral summer, significantly higher chlorophyll a (Chl a) concentrations were measur...
Published in: | Limnology and Oceanography |
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Language: | English |
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2007
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ftsouthampton:oai:eprints.soton.ac.uk:413897 2023-07-30T03:59:16+02:00 Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea Bertrand, Erin M. Saito, Mak A. Rose, Julie M. Riesselman, Christina R. Lohan, Maeve C. Noble, Abigail E. Lee, Peter A. DiTullio, Giacomo R. 2007-05 https://eprints.soton.ac.uk/413897/ English eng Bertrand, Erin M., Saito, Mak A., Rose, Julie M., Riesselman, Christina R., Lohan, Maeve C., Noble, Abigail E., Lee, Peter A. and DiTullio, Giacomo R. (2007) Vitamin B12 and iron colimitation of phytoplankton growth in the Ross Sea. Limnology and Oceanography, 52 (3), 1079-1093. (doi:10.4319/lo.2007.52.3.1079 <http://dx.doi.org/10.4319/lo.2007.52.3.1079>). Article PeerReviewed 2007 ftsouthampton https://doi.org/10.4319/lo.2007.52.3.1079 2023-07-09T22:17:38Z Primary production in the Ross Sea, one of the most productive areas in the Southern Ocean, has previously been shown to be seasonally limited by iron. In two of three bottle incubation experiments conducted in the austral summer, significantly higher chlorophyll a (Chl a) concentrations were measured upon the addition of iron and B 12 , relative to iron additions alone. Initial bacterial abundances were significantly lower in the two experiments that showed phytoplankton stimulation upon addition of B 12 and iron relative to the experiment that did not show this stimulation. This is consistent with the hypothesis that the bacteria and archaea in the upper water column are an important source of B 12 to marine phytoplankton. The addition of iron alone increased the growth of Phaeocystis antarctica relative to diatoms, whereas in an experiment where iron and B 12 stimulated total phytoplankton growth, the diatom Pseudonitzschia subcurvata went from comprising approximately 70% of the phytoplankton community to over 90%. Cobalt additions, with and without iron, did not alter Chl a biomass relative to controls and iron additions alone in the Ross Sea. Iron and vitamin B 12 plus iron treatments caused reductions in the DMSP (dimethyl sulfoniopropionate) : Chl a ratio relative to the control and B 12 treatments, consistent with the notion of an antioxidant function for DMSP. These results demonstrate the importance of a vitamin to phytoplankton growth and community composition in the marine environment. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Southern Ocean University of Southampton: e-Prints Soton Austral Ross Sea Southern Ocean Limnology and Oceanography 52 3 1079 1093 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
Primary production in the Ross Sea, one of the most productive areas in the Southern Ocean, has previously been shown to be seasonally limited by iron. In two of three bottle incubation experiments conducted in the austral summer, significantly higher chlorophyll a (Chl a) concentrations were measured upon the addition of iron and B 12 , relative to iron additions alone. Initial bacterial abundances were significantly lower in the two experiments that showed phytoplankton stimulation upon addition of B 12 and iron relative to the experiment that did not show this stimulation. This is consistent with the hypothesis that the bacteria and archaea in the upper water column are an important source of B 12 to marine phytoplankton. The addition of iron alone increased the growth of Phaeocystis antarctica relative to diatoms, whereas in an experiment where iron and B 12 stimulated total phytoplankton growth, the diatom Pseudonitzschia subcurvata went from comprising approximately 70% of the phytoplankton community to over 90%. Cobalt additions, with and without iron, did not alter Chl a biomass relative to controls and iron additions alone in the Ross Sea. Iron and vitamin B 12 plus iron treatments caused reductions in the DMSP (dimethyl sulfoniopropionate) : Chl a ratio relative to the control and B 12 treatments, consistent with the notion of an antioxidant function for DMSP. These results demonstrate the importance of a vitamin to phytoplankton growth and community composition in the marine environment. |
format |
Article in Journal/Newspaper |
author |
Bertrand, Erin M. Saito, Mak A. Rose, Julie M. Riesselman, Christina R. Lohan, Maeve C. Noble, Abigail E. Lee, Peter A. DiTullio, Giacomo R. |
spellingShingle |
Bertrand, Erin M. Saito, Mak A. Rose, Julie M. Riesselman, Christina R. Lohan, Maeve C. Noble, Abigail E. Lee, Peter A. DiTullio, Giacomo R. Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
author_facet |
Bertrand, Erin M. Saito, Mak A. Rose, Julie M. Riesselman, Christina R. Lohan, Maeve C. Noble, Abigail E. Lee, Peter A. DiTullio, Giacomo R. |
author_sort |
Bertrand, Erin M. |
title |
Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
title_short |
Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
title_full |
Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
title_fullStr |
Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
title_full_unstemmed |
Vitamin B 12 and iron colimitation of phytoplankton growth in the Ross Sea |
title_sort |
vitamin b 12 and iron colimitation of phytoplankton growth in the ross sea |
publishDate |
2007 |
url |
https://eprints.soton.ac.uk/413897/ |
geographic |
Austral Ross Sea Southern Ocean |
geographic_facet |
Austral Ross Sea Southern Ocean |
genre |
Antarc* Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica Ross Sea Southern Ocean |
op_relation |
Bertrand, Erin M., Saito, Mak A., Rose, Julie M., Riesselman, Christina R., Lohan, Maeve C., Noble, Abigail E., Lee, Peter A. and DiTullio, Giacomo R. (2007) Vitamin B12 and iron colimitation of phytoplankton growth in the Ross Sea. Limnology and Oceanography, 52 (3), 1079-1093. (doi:10.4319/lo.2007.52.3.1079 <http://dx.doi.org/10.4319/lo.2007.52.3.1079>). |
op_doi |
https://doi.org/10.4319/lo.2007.52.3.1079 |
container_title |
Limnology and Oceanography |
container_volume |
52 |
container_issue |
3 |
container_start_page |
1079 |
op_container_end_page |
1093 |
_version_ |
1772810011349614592 |