Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region
In March 1998 we measured iron in the upper water column and conducted iron- and nutrient-enrichment bottle-incubation experiments in the open-ocean Subantarctic region southwest of Tasmania, Australia. In the Subtropical Convergence Zone (∼42°S, 142°E), silicic acid concentrations were low (< 1....
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1999
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Online Access: | https://digitalcommons.odu.edu/oeas_fac_pubs/94 https://doi.org/10.1029/1998GL002284 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1101/viewcontent/Sedwick_1999_Limitation_of_algal_growth_by_iro.pdf |
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1101 2023-06-11T04:17:01+02:00 Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region Sedwick, Peter N. DiTullio, Giacomo R. Hutchins, David A. Boyd, Philip W. Griffiths, F. Brian Crossley, A. Clive Trull, Thomas W. Queguiner, Bernard 1999-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/94 https://doi.org/10.1029/1998GL002284 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1101/viewcontent/Sedwick_1999_Limitation_of_algal_growth_by_iro.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/94 doi:10.1029/1998GL002284 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1101/viewcontent/Sedwick_1999_Limitation_of_algal_growth_by_iro.pdf OES Faculty Publications Phytoplankton growth Limitation Iron deficiency Tasmania Subantarctic Subtropical Convergence Zone Silicic acid Mineral aerosol Biogeochemistry Biology Oceanography article 1999 ftolddominionuni https://doi.org/10.1029/1998GL002284 2023-05-08T17:59:38Z In March 1998 we measured iron in the upper water column and conducted iron- and nutrient-enrichment bottle-incubation experiments in the open-ocean Subantarctic region southwest of Tasmania, Australia. In the Subtropical Convergence Zone (∼42°S, 142°E), silicic acid concentrations were low (< 1.5μM) in the upper water column, whereas pronounced vertical gradients in dissolved iron concentration (0.12-0.84 nM) were observed., presumably reflecting the interleaving of Subtropical and Subantarctic waters, and mineral aerosol input. Results of a bottle-incubation experiment performed at this location indicate that phytoplankton growth rates were limited by iron deficiency within the iron-poor layer of the euphotic zone. In the Subantarctic water mass (∼46.8°S, 142°E), low concentrations of dissolved iron (0.05-0.11nM) and silicic acid (< 1μM) were measured throughout the upper water column, and our experimental results indicate that algal growth was limited by iron deficiency. These observations suggest that availability of dissolved iron is a primary factor limiting phytoplankton growth over much of the Subantarctic Southern Ocean in the late summer and autumn. Article in Journal/Newspaper Southern Ocean Old Dominion University: ODU Digital Commons Southern Ocean Geophysical Research Letters 26 18 2865 2868 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Phytoplankton growth Limitation Iron deficiency Tasmania Subantarctic Subtropical Convergence Zone Silicic acid Mineral aerosol Biogeochemistry Biology Oceanography |
spellingShingle |
Phytoplankton growth Limitation Iron deficiency Tasmania Subantarctic Subtropical Convergence Zone Silicic acid Mineral aerosol Biogeochemistry Biology Oceanography Sedwick, Peter N. DiTullio, Giacomo R. Hutchins, David A. Boyd, Philip W. Griffiths, F. Brian Crossley, A. Clive Trull, Thomas W. Queguiner, Bernard Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
topic_facet |
Phytoplankton growth Limitation Iron deficiency Tasmania Subantarctic Subtropical Convergence Zone Silicic acid Mineral aerosol Biogeochemistry Biology Oceanography |
description |
In March 1998 we measured iron in the upper water column and conducted iron- and nutrient-enrichment bottle-incubation experiments in the open-ocean Subantarctic region southwest of Tasmania, Australia. In the Subtropical Convergence Zone (∼42°S, 142°E), silicic acid concentrations were low (< 1.5μM) in the upper water column, whereas pronounced vertical gradients in dissolved iron concentration (0.12-0.84 nM) were observed., presumably reflecting the interleaving of Subtropical and Subantarctic waters, and mineral aerosol input. Results of a bottle-incubation experiment performed at this location indicate that phytoplankton growth rates were limited by iron deficiency within the iron-poor layer of the euphotic zone. In the Subantarctic water mass (∼46.8°S, 142°E), low concentrations of dissolved iron (0.05-0.11nM) and silicic acid (< 1μM) were measured throughout the upper water column, and our experimental results indicate that algal growth was limited by iron deficiency. These observations suggest that availability of dissolved iron is a primary factor limiting phytoplankton growth over much of the Subantarctic Southern Ocean in the late summer and autumn. |
format |
Article in Journal/Newspaper |
author |
Sedwick, Peter N. DiTullio, Giacomo R. Hutchins, David A. Boyd, Philip W. Griffiths, F. Brian Crossley, A. Clive Trull, Thomas W. Queguiner, Bernard |
author_facet |
Sedwick, Peter N. DiTullio, Giacomo R. Hutchins, David A. Boyd, Philip W. Griffiths, F. Brian Crossley, A. Clive Trull, Thomas W. Queguiner, Bernard |
author_sort |
Sedwick, Peter N. |
title |
Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
title_short |
Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
title_full |
Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
title_fullStr |
Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
title_full_unstemmed |
Limitation of Algal Growth by Iron Deficiency in the Australian Subantarctic Region |
title_sort |
limitation of algal growth by iron deficiency in the australian subantarctic region |
publisher |
ODU Digital Commons |
publishDate |
1999 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/94 https://doi.org/10.1029/1998GL002284 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1101/viewcontent/Sedwick_1999_Limitation_of_algal_growth_by_iro.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/94 doi:10.1029/1998GL002284 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1101/viewcontent/Sedwick_1999_Limitation_of_algal_growth_by_iro.pdf |
op_doi |
https://doi.org/10.1029/1998GL002284 |
container_title |
Geophysical Research Letters |
container_volume |
26 |
container_issue |
18 |
container_start_page |
2865 |
op_container_end_page |
2868 |
_version_ |
1768375798576709632 |