Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer
International audience As part of two USJGOFS cruises, we investigated spatial variability in phytoplankton properties across the strong environmental gradient associated with the Antarctic Polar Frontal Zone during late austral summers of 1997 and 1998. Cell properties, including size and an index...
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ftunivnantes:oai:HAL:hal-01663384v1 2023-05-15T13:32:38+02:00 Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer Sosik, Heidi Olson, Robert Woods Hole Oceanographic Institution (WHOI) 2002 https://hal.science/hal-01663384 https://doi.org/10.1016/S0967-0637(02)00015-8 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(02)00015-8 hal-01663384 https://hal.science/hal-01663384 doi:10.1016/S0967-0637(02)00015-8 http://creativecommons.org/licenses/by-nc/ CC-BY-NC ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-01663384 Deep Sea Research Part I: Oceanographic Research Papers, 2002, 49 (7), pp.1195-1216. ⟨10.1016/S0967-0637(02)00015-8⟩ Phytoplankton Photosynthesis Fluorescence Nutrients Iron Flow cytometry Fast repetition rate fluorometry Southern Ocean Antarctic Polar Frontal Zone Ross Sea [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2002 ftunivnantes https://doi.org/10.1016/S0967-0637(02)00015-8 2023-02-08T09:01:23Z International audience As part of two USJGOFS cruises, we investigated spatial variability in phytoplankton properties across the strong environmental gradient associated with the Antarctic Polar Frontal Zone during late austral summers of 1997 and 1998. Cell properties, including size and an index of pigment content as well as photosynthetic efficiency (as indicated by relative variable fluorescence), changed dramatically across this frontal region. A general trend toward reduced photosynthetic efficiency south of the Polar Front was correlated with low dissolved iron concentration and is consistent with physiological iron limitation in the phytoplankton. We detected no significant differences in photosynthetic efficiency among different size classes of the dominant pico- to nanophytoplankton, despite a systematic community level shift toward larger sized cells south of the Polar Front. In contrast to other cells, those classified as cryptophyte algae showed relatively high photosynthetic efficiency in low iron waters; however, this group was never found in high abundance. One group, all cells ⩽2 μm, showed an unexpected increase in intracellular pigment content (based on single cell chlorophyll fluorescence measurements) south of the Polar Front where dissolved iron concentration and the cells’ relative abundance were low. Overall, these results suggest that group- or size-specific differences in physiological status were not directly regulating community structure in the pico- to nanophytoplankton during the late summer season; other processes, such as differential grazing or sinking losses, must be important. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Austral Ross Sea Southern Ocean The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 49 7 1195 1216 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Phytoplankton Photosynthesis Fluorescence Nutrients Iron Flow cytometry Fast repetition rate fluorometry Southern Ocean Antarctic Polar Frontal Zone Ross Sea [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Phytoplankton Photosynthesis Fluorescence Nutrients Iron Flow cytometry Fast repetition rate fluorometry Southern Ocean Antarctic Polar Frontal Zone Ross Sea [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sosik, Heidi Olson, Robert Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
topic_facet |
Phytoplankton Photosynthesis Fluorescence Nutrients Iron Flow cytometry Fast repetition rate fluorometry Southern Ocean Antarctic Polar Frontal Zone Ross Sea [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience As part of two USJGOFS cruises, we investigated spatial variability in phytoplankton properties across the strong environmental gradient associated with the Antarctic Polar Frontal Zone during late austral summers of 1997 and 1998. Cell properties, including size and an index of pigment content as well as photosynthetic efficiency (as indicated by relative variable fluorescence), changed dramatically across this frontal region. A general trend toward reduced photosynthetic efficiency south of the Polar Front was correlated with low dissolved iron concentration and is consistent with physiological iron limitation in the phytoplankton. We detected no significant differences in photosynthetic efficiency among different size classes of the dominant pico- to nanophytoplankton, despite a systematic community level shift toward larger sized cells south of the Polar Front. In contrast to other cells, those classified as cryptophyte algae showed relatively high photosynthetic efficiency in low iron waters; however, this group was never found in high abundance. One group, all cells ⩽2 μm, showed an unexpected increase in intracellular pigment content (based on single cell chlorophyll fluorescence measurements) south of the Polar Front where dissolved iron concentration and the cells’ relative abundance were low. Overall, these results suggest that group- or size-specific differences in physiological status were not directly regulating community structure in the pico- to nanophytoplankton during the late summer season; other processes, such as differential grazing or sinking losses, must be important. |
author2 |
Woods Hole Oceanographic Institution (WHOI) |
format |
Article in Journal/Newspaper |
author |
Sosik, Heidi Olson, Robert |
author_facet |
Sosik, Heidi Olson, Robert |
author_sort |
Sosik, Heidi |
title |
Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
title_short |
Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
title_full |
Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
title_fullStr |
Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
title_full_unstemmed |
Phytoplankton and iron limitation of photosynthetic efficiency in the Southern Ocean during late summer |
title_sort |
phytoplankton and iron limitation of photosynthetic efficiency in the southern ocean during late summer |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-01663384 https://doi.org/10.1016/S0967-0637(02)00015-8 |
geographic |
Antarctic Austral Ross Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Ross Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-01663384 Deep Sea Research Part I: Oceanographic Research Papers, 2002, 49 (7), pp.1195-1216. ⟨10.1016/S0967-0637(02)00015-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0967-0637(02)00015-8 hal-01663384 https://hal.science/hal-01663384 doi:10.1016/S0967-0637(02)00015-8 |
op_rights |
http://creativecommons.org/licenses/by-nc/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1016/S0967-0637(02)00015-8 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
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49 |
container_issue |
7 |
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1195 |
op_container_end_page |
1216 |
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1766028755160006656 |