Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas
Nutrient addition experiments were performed during the austral summer in the Amundsen Sea (Southern Ocean) to investigate the availability of organically bound iron (Fe) to the phytoplankton communities, as well as assess their response to Fe amendment. Changes in autotrophic biomass, pigment conce...
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Language: | English |
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ftnioz:oai:imis.nioz.nl:231005 2023-05-15T13:23:49+02:00 Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas Mills, M.M. Alderkamp, A.C. Thuróczy, C.E. van Dijken, G.L. Laan, P. de Baar, H.J.W. Arrigo, K.R. 2012 http://imis.nioz.nl/imis.php?module=ref&refid=231005 en eng info:eu-repo/semantics/altIdentifier/wos/000305720600006 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.dsr2.2012.03.008 http://imis.nioz.nl/imis.php?module=ref&refid=231005 info:eu-repo/semantics/closedAccess %3Ci%3EDeep-Sea+Res.,+Part+II,+Top.+Stud.+Oceanogr.+71-76%3C%2Fi%3E%3A+61-76.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr2.2012.03.008%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr2.2012.03.008%3C%2Fa%3E Phaeocystis antarctica info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftnioz https://doi.org/10.1016/j.dsr2.2012.03.008 2022-05-01T13:56:52Z Nutrient addition experiments were performed during the austral summer in the Amundsen Sea (Southern Ocean) to investigate the availability of organically bound iron (Fe) to the phytoplankton communities, as well as assess their response to Fe amendment. Changes in autotrophic biomass, pigment concentration, maximum photochemical efficiency of photosystem II, and nutrient concentration were recorded in response to the addition of dissolved free Fe (DFe) and Fe bound to different model ligands. Analysis of pigment concentrations indicated that the autotrophic community was dominated by the prymnesiophyte Phaeocystis antarctica throughout most of the Amundsen Sea, although diatoms dominated in two experiments conducted in the marginal ice zone. Few significant differences in bulk community biomass (particulate organic carbon, nitrogen, and chlorophyll a) were observed, relative to the controls, in treatments with Fe added alone or bound to the ligand phytic acid. In contrast, when Fe was bound to the ligand desferrioxamine B (DFB), decreases in the bulk biomass indices were observed. The concentration of the diatom accessory pigment fucoxanthin showed little response to Fe additions, while the concentration of the P. antarctica-specific pigment, 19'-hexanoyloxyfucoxanthin (19'-hex), decreased when Fe was added alone or bound to the model ligands. Lastly, differences in the nitrate:phosphate (NO3-:PO43-) utilization ratio were observed between the Fe-amended treatments, with Fe bound to DFB resulting in the lowest NO3-:PO43- uptake ratios (similar to 10) and the remaining Fe treatments having higher NO3-:PO43- uptake ratios (similar to 17). The data are discussed with respect to glacial inputs of Fe in the Amundsen Sea and the bioavailability of Fe. We suggest that the previously observed high NO3-:PO43- utilization ratio of P. antarctica is a consequence of its production of dissolved organic matter that acts as ligands and increases the bioavailability of Fe, thereby stimulating the uptake of NO3-. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Pine Island Southern Ocean NIOZ Repository (Royal Netherlands Institute for Sea Research) Southern Ocean Austral Amundsen Sea Deep Sea Research Part II: Topical Studies in Oceanography 71-76 61 76 |
institution |
Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
op_collection_id |
ftnioz |
language |
English |
topic |
Phaeocystis antarctica |
spellingShingle |
Phaeocystis antarctica Mills, M.M. Alderkamp, A.C. Thuróczy, C.E. van Dijken, G.L. Laan, P. de Baar, H.J.W. Arrigo, K.R. Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
topic_facet |
Phaeocystis antarctica |
description |
Nutrient addition experiments were performed during the austral summer in the Amundsen Sea (Southern Ocean) to investigate the availability of organically bound iron (Fe) to the phytoplankton communities, as well as assess their response to Fe amendment. Changes in autotrophic biomass, pigment concentration, maximum photochemical efficiency of photosystem II, and nutrient concentration were recorded in response to the addition of dissolved free Fe (DFe) and Fe bound to different model ligands. Analysis of pigment concentrations indicated that the autotrophic community was dominated by the prymnesiophyte Phaeocystis antarctica throughout most of the Amundsen Sea, although diatoms dominated in two experiments conducted in the marginal ice zone. Few significant differences in bulk community biomass (particulate organic carbon, nitrogen, and chlorophyll a) were observed, relative to the controls, in treatments with Fe added alone or bound to the ligand phytic acid. In contrast, when Fe was bound to the ligand desferrioxamine B (DFB), decreases in the bulk biomass indices were observed. The concentration of the diatom accessory pigment fucoxanthin showed little response to Fe additions, while the concentration of the P. antarctica-specific pigment, 19'-hexanoyloxyfucoxanthin (19'-hex), decreased when Fe was added alone or bound to the model ligands. Lastly, differences in the nitrate:phosphate (NO3-:PO43-) utilization ratio were observed between the Fe-amended treatments, with Fe bound to DFB resulting in the lowest NO3-:PO43- uptake ratios (similar to 10) and the remaining Fe treatments having higher NO3-:PO43- uptake ratios (similar to 17). The data are discussed with respect to glacial inputs of Fe in the Amundsen Sea and the bioavailability of Fe. We suggest that the previously observed high NO3-:PO43- utilization ratio of P. antarctica is a consequence of its production of dissolved organic matter that acts as ligands and increases the bioavailability of Fe, thereby stimulating the uptake of NO3-. |
format |
Article in Journal/Newspaper |
author |
Mills, M.M. Alderkamp, A.C. Thuróczy, C.E. van Dijken, G.L. Laan, P. de Baar, H.J.W. Arrigo, K.R. |
author_facet |
Mills, M.M. Alderkamp, A.C. Thuróczy, C.E. van Dijken, G.L. Laan, P. de Baar, H.J.W. Arrigo, K.R. |
author_sort |
Mills, M.M. |
title |
Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
title_short |
Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
title_full |
Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
title_fullStr |
Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
title_full_unstemmed |
Phytoplankton biomass and pigment responses to Fe amendments in the Pine Island and Amundsen polynyas |
title_sort |
phytoplankton biomass and pigment responses to fe amendments in the pine island and amundsen polynyas |
publishDate |
2012 |
url |
http://imis.nioz.nl/imis.php?module=ref&refid=231005 |
geographic |
Southern Ocean Austral Amundsen Sea |
geographic_facet |
Southern Ocean Austral Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctica Pine Island Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctica Pine Island Southern Ocean |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000305720600006 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.dsr2.2012.03.008 http://imis.nioz.nl/imis.php?module=ref&refid=231005 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2012.03.008 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
71-76 |
container_start_page |
61 |
op_container_end_page |
76 |
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1766375615308496896 |