Nutrient regimes control phytoplankton ecophysiology in the South Atlantic
Fast Repetition Rate fluorometry (FRRf) measurements of phytoplankton photophysiology from an acrossbasin South Atlantic cruise (as part of the GEOTRACES programme) characterised two dominant ecophysiological regimes which were interpreted on the basis of nutrient limitation. South of the South Subt...
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Copernicus Publications (EGU)
2014
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Online Access: | https://oceanrep.geomar.de/id/eprint/26560/ https://oceanrep.geomar.de/id/eprint/26560/1/bg-11-463-2014.pdf https://doi.org/10.5194/bg-11-463-2014 |
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ftoceanrep:oai:oceanrep.geomar.de:26560 2023-05-15T14:07:51+02:00 Nutrient regimes control phytoplankton ecophysiology in the South Atlantic Browning, T. J. Bouman, H. A. Moore, C. M. Schlosser, Christian Tarran, G. A. Woodward, E. M. S. Henderson, G. M. 2014-01-30 text https://oceanrep.geomar.de/id/eprint/26560/ https://oceanrep.geomar.de/id/eprint/26560/1/bg-11-463-2014.pdf https://doi.org/10.5194/bg-11-463-2014 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/26560/1/bg-11-463-2014.pdf Browning, T. J., Bouman, H. A., Moore, C. M., Schlosser, C. , Tarran, G. A., Woodward, E. M. S. and Henderson, G. M. (2014) Nutrient regimes control phytoplankton ecophysiology in the South Atlantic. Open Access Biogeosciences (BG), 11 (2). pp. 463-479. DOI 10.5194/bg-11-463-2014 <https://doi.org/10.5194/bg-11-463-2014>. doi:10.5194/bg-11-463-2014 info:eu-repo/semantics/openAccess Article PeerReviewed 2014 ftoceanrep https://doi.org/10.5194/bg-11-463-2014 2023-04-07T15:16:06Z Fast Repetition Rate fluorometry (FRRf) measurements of phytoplankton photophysiology from an acrossbasin South Atlantic cruise (as part of the GEOTRACES programme) characterised two dominant ecophysiological regimes which were interpreted on the basis of nutrient limitation. South of the South Subtropical Convergence (SSTC) in the northern sub-Antarctic sector of the Antarctic Circumpolar Current (ACC) in the Eastern Atlantic Basin, waters are characterised by elevated chlorophyll concentrations, a dominance by larger phytoplankton cells, and low apparent photochemical efficiency (Fv / Fm). Shipboard 24 h iron (Fe) addition incubation experiments confirmed that Fe stress was primarily responsible for the low Fv / Fm, with Fe addition to these waters, either within the artificial bottle additions or naturally occurring downstream enrichment from Gough Island, significantly increasing Fv / Fm values. To the north of the SSTC at the southern boundary of the South Atlantic Gyre, phytoplankton are characterised by high values of Fv / Fm which, coupled with the low macronutrient concentrations and increased presence of picocyanobacteria, are interpreted as conditions of Fe replete, balanced macronutrient-limited growth. Spatial correlation was found between Fv / Fm and Fe:nitrate ratios, supporting the suggestion that the relative supply ratios of these two nutrients can control patterns of limitation and consequently the ecophysiology of phytoplankton in subtropical gyre and ACC regimes. Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Gough ENVELOPE(159.367,159.367,-81.633,-81.633) Biogeosciences 11 2 463 479 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Fast Repetition Rate fluorometry (FRRf) measurements of phytoplankton photophysiology from an acrossbasin South Atlantic cruise (as part of the GEOTRACES programme) characterised two dominant ecophysiological regimes which were interpreted on the basis of nutrient limitation. South of the South Subtropical Convergence (SSTC) in the northern sub-Antarctic sector of the Antarctic Circumpolar Current (ACC) in the Eastern Atlantic Basin, waters are characterised by elevated chlorophyll concentrations, a dominance by larger phytoplankton cells, and low apparent photochemical efficiency (Fv / Fm). Shipboard 24 h iron (Fe) addition incubation experiments confirmed that Fe stress was primarily responsible for the low Fv / Fm, with Fe addition to these waters, either within the artificial bottle additions or naturally occurring downstream enrichment from Gough Island, significantly increasing Fv / Fm values. To the north of the SSTC at the southern boundary of the South Atlantic Gyre, phytoplankton are characterised by high values of Fv / Fm which, coupled with the low macronutrient concentrations and increased presence of picocyanobacteria, are interpreted as conditions of Fe replete, balanced macronutrient-limited growth. Spatial correlation was found between Fv / Fm and Fe:nitrate ratios, supporting the suggestion that the relative supply ratios of these two nutrients can control patterns of limitation and consequently the ecophysiology of phytoplankton in subtropical gyre and ACC regimes. |
format |
Article in Journal/Newspaper |
author |
Browning, T. J. Bouman, H. A. Moore, C. M. Schlosser, Christian Tarran, G. A. Woodward, E. M. S. Henderson, G. M. |
spellingShingle |
Browning, T. J. Bouman, H. A. Moore, C. M. Schlosser, Christian Tarran, G. A. Woodward, E. M. S. Henderson, G. M. Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
author_facet |
Browning, T. J. Bouman, H. A. Moore, C. M. Schlosser, Christian Tarran, G. A. Woodward, E. M. S. Henderson, G. M. |
author_sort |
Browning, T. J. |
title |
Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
title_short |
Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
title_full |
Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
title_fullStr |
Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
title_full_unstemmed |
Nutrient regimes control phytoplankton ecophysiology in the South Atlantic |
title_sort |
nutrient regimes control phytoplankton ecophysiology in the south atlantic |
publisher |
Copernicus Publications (EGU) |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/26560/ https://oceanrep.geomar.de/id/eprint/26560/1/bg-11-463-2014.pdf https://doi.org/10.5194/bg-11-463-2014 |
long_lat |
ENVELOPE(159.367,159.367,-81.633,-81.633) |
geographic |
Antarctic The Antarctic Gough |
geographic_facet |
Antarctic The Antarctic Gough |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/26560/1/bg-11-463-2014.pdf Browning, T. J., Bouman, H. A., Moore, C. M., Schlosser, C. , Tarran, G. A., Woodward, E. M. S. and Henderson, G. M. (2014) Nutrient regimes control phytoplankton ecophysiology in the South Atlantic. Open Access Biogeosciences (BG), 11 (2). pp. 463-479. DOI 10.5194/bg-11-463-2014 <https://doi.org/10.5194/bg-11-463-2014>. doi:10.5194/bg-11-463-2014 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-11-463-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
2 |
container_start_page |
463 |
op_container_end_page |
479 |
_version_ |
1766279892416069632 |