Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea
Waters of the Southern Ocean are characterized by high macronutrient concentrations but limited availability of trace metals and light, often making it difficult for phytoplankton to achieve maximum growth rates. One strategy employed by Southern Ocean phytoplankton in culture to cope with low light...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://hdl.handle.net/11370/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://research.rug.nl/en/publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://doi.org/10.3354/meps13000 https://pure.rug.nl/ws/files/94213518/m621p033.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b 2024-06-02T07:58:11+00:00 Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea Alderkamp, Anne-Carlijn Dijken, Gert L. van Lowry, Kate E. Lewis, Kate M. Joy-Warren, Hannah L. Poll, van de, Willem Laan, Patrick Gerringa, Loes J.A. Delmont, Tom O. Jenkins, Bethany D. Arrigo, Kevin R. 2019-07-04 application/pdf https://hdl.handle.net/11370/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://research.rug.nl/en/publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://doi.org/10.3354/meps13000 https://pure.rug.nl/ws/files/94213518/m621p033.pdf eng eng https://research.rug.nl/en/publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b info:eu-repo/semantics/openAccess Alderkamp , A-C , Dijken , G L V , Lowry , K E , Lewis , K M , Joy-Warren , H L , Poll, van de , W , Laan , P , Gerringa , L J A , Delmont , T O , Jenkins , B D & Arrigo , K R 2019 , ' Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea ' , Marine Ecology Progress Series , vol. 621 , pp. 33-50 . https://doi.org/10.3354/meps13000 Phytoplankton Photophysiology Iron limitation Ross Sea article 2019 ftunigroningenpu https://doi.org/10.3354/meps13000 2024-05-07T20:39:48Z Waters of the Southern Ocean are characterized by high macronutrient concentrations but limited availability of trace metals and light, often making it difficult for phytoplankton to achieve maximum growth rates. One strategy employed by Southern Ocean phytoplankton in culture to cope with low light and low dissolved iron (DFe) is to enhance light absorption by increasing their antenna size rather than the number of reaction centers, thereby reducing their Fe demand. Here we provide physiological evidence that natural populations of Southern Ocean phytoplankton employ a similar photoacclimation strategy to cope with low ambient DFe concentrations. During a research cruise to the Ross Sea in 2013-2014, we conducted 4 bioassay experiments in which we manipulated light and DFe concentrations and measured changes in phytoplankton biomass, growth rate, photosynthetic parameters, fluorescence parameters, and pigment composition. Phytoplankton responded strongly to DFe additions, exhibiting significantly higher biomass, growth rates, and photosynthetic competency. At low light, the maximum photosynthetic rate (P*max) was significantly reduced and the photosynthetic efficiency (α*) was unchanged compared to the high light treatment, regardless of phytoplankton species composition or DFe concentration. Our data suggest that Southern Ocean phytoplankton have evolved an Fe-saving strategy whereby they photoacclimate to low light by increasing their photosynthetic unit size, rather than photosynthetic unit number, even when DFe is available. It appears this Fe-saving strategy is characteristic of both Phaeocystis antarctica and diatoms, suggesting that it is a common adaptation among phytoplankton taxa that grow under Fe limitation in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Southern Ocean University of Groningen research database Ross Sea Southern Ocean Marine Ecology Progress Series 621 33 50 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
Phytoplankton Photophysiology Iron limitation Ross Sea |
spellingShingle |
Phytoplankton Photophysiology Iron limitation Ross Sea Alderkamp, Anne-Carlijn Dijken, Gert L. van Lowry, Kate E. Lewis, Kate M. Joy-Warren, Hannah L. Poll, van de, Willem Laan, Patrick Gerringa, Loes J.A. Delmont, Tom O. Jenkins, Bethany D. Arrigo, Kevin R. Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
topic_facet |
Phytoplankton Photophysiology Iron limitation Ross Sea |
description |
Waters of the Southern Ocean are characterized by high macronutrient concentrations but limited availability of trace metals and light, often making it difficult for phytoplankton to achieve maximum growth rates. One strategy employed by Southern Ocean phytoplankton in culture to cope with low light and low dissolved iron (DFe) is to enhance light absorption by increasing their antenna size rather than the number of reaction centers, thereby reducing their Fe demand. Here we provide physiological evidence that natural populations of Southern Ocean phytoplankton employ a similar photoacclimation strategy to cope with low ambient DFe concentrations. During a research cruise to the Ross Sea in 2013-2014, we conducted 4 bioassay experiments in which we manipulated light and DFe concentrations and measured changes in phytoplankton biomass, growth rate, photosynthetic parameters, fluorescence parameters, and pigment composition. Phytoplankton responded strongly to DFe additions, exhibiting significantly higher biomass, growth rates, and photosynthetic competency. At low light, the maximum photosynthetic rate (P*max) was significantly reduced and the photosynthetic efficiency (α*) was unchanged compared to the high light treatment, regardless of phytoplankton species composition or DFe concentration. Our data suggest that Southern Ocean phytoplankton have evolved an Fe-saving strategy whereby they photoacclimate to low light by increasing their photosynthetic unit size, rather than photosynthetic unit number, even when DFe is available. It appears this Fe-saving strategy is characteristic of both Phaeocystis antarctica and diatoms, suggesting that it is a common adaptation among phytoplankton taxa that grow under Fe limitation in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Alderkamp, Anne-Carlijn Dijken, Gert L. van Lowry, Kate E. Lewis, Kate M. Joy-Warren, Hannah L. Poll, van de, Willem Laan, Patrick Gerringa, Loes J.A. Delmont, Tom O. Jenkins, Bethany D. Arrigo, Kevin R. |
author_facet |
Alderkamp, Anne-Carlijn Dijken, Gert L. van Lowry, Kate E. Lewis, Kate M. Joy-Warren, Hannah L. Poll, van de, Willem Laan, Patrick Gerringa, Loes J.A. Delmont, Tom O. Jenkins, Bethany D. Arrigo, Kevin R. |
author_sort |
Alderkamp, Anne-Carlijn |
title |
Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
title_short |
Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
title_full |
Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
title_fullStr |
Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
title_full_unstemmed |
Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea |
title_sort |
effects of iron and light availability on phytoplankton photosynthetic properties in the ross sea |
publishDate |
2019 |
url |
https://hdl.handle.net/11370/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://research.rug.nl/en/publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b https://doi.org/10.3354/meps13000 https://pure.rug.nl/ws/files/94213518/m621p033.pdf |
geographic |
Ross Sea Southern Ocean |
geographic_facet |
Ross Sea Southern Ocean |
genre |
Antarc* Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica Ross Sea Southern Ocean |
op_source |
Alderkamp , A-C , Dijken , G L V , Lowry , K E , Lewis , K M , Joy-Warren , H L , Poll, van de , W , Laan , P , Gerringa , L J A , Delmont , T O , Jenkins , B D & Arrigo , K R 2019 , ' Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea ' , Marine Ecology Progress Series , vol. 621 , pp. 33-50 . https://doi.org/10.3354/meps13000 |
op_relation |
https://research.rug.nl/en/publications/75777a71-bfa3-45bc-80ad-25bacdc5c62b |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps13000 |
container_title |
Marine Ecology Progress Series |
container_volume |
621 |
container_start_page |
33 |
op_container_end_page |
50 |
_version_ |
1800741462001844224 |