Iron-mediated change in phytoplankton photosynthetic competence during SOIREE
Active fluorescence (Fast Repetiton Rate Fluorometry, FRRF) was used to follow the photosynthetic response of the phytoplankton community during the Southern Ocean Iron RElease Experiment (SOIREE). This in situ iron enrichment was conducted in the polar waters of the Australasian-Pacific sector of t...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.23.5067 2023-05-15T18:24:50+02:00 Iron-mediated change in phytoplankton photosynthetic competence during SOIREE Philip Boyd Edward Abraham P. W. Boyd E. R. Abraham The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.5067 http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.5067 http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf text 2001 ftciteseerx 2016-01-07T18:40:52Z Active fluorescence (Fast Repetiton Rate Fluorometry, FRRF) was used to follow the photosynthetic response of the phytoplankton community during the Southern Ocean Iron RElease Experiment (SOIREE). This in situ iron enrichment was conducted in the polar waters of the Australasian-Pacific sector of the Southern Ocean in February 1999. Iron fertilisation of these High Nitrate Low Chlorophyll (HNLC) waters resulted in an increase in the photosynthetic competence (Fv/Fm) of the resident cells from around 0.20 to greater than 0.60 (i.e. close to the theoretical maximum) by days 10/11 of the experiment. Although a significant iron-mediated response in Fv/Fm was detected as early as 24 h after the initial enrichment, the increase in Fv/Fm to double ambient levels took 6 days. This response was five-fold slower that observed in iron enrichments (in situ and in vitro) in the HNLC waters of the sub-polar and Equatorial Pacific. During SOIREE, the photosynthetic competence of the resident phytoplankton in iron-enriched waters increased at dissolved iron levels above 0.2 nM, suggesting that iron limitation was alleviated at this concentration. Increases in Fv/Fm of cells within three algal size classes suggested that all taxa displayed a photosynthetic response to iron enrichment. Other physiological proxies of algal iron stress (such as flavodoxin expression) exhibited different trends than Fv/Fm during the time-course of SOIREE, the relationship between Fv/Fm, algal growth rate and such proxies in Southern Ocean waters is discussed. Text Southern Ocean Unknown Pacific Southern Ocean |
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description |
Active fluorescence (Fast Repetiton Rate Fluorometry, FRRF) was used to follow the photosynthetic response of the phytoplankton community during the Southern Ocean Iron RElease Experiment (SOIREE). This in situ iron enrichment was conducted in the polar waters of the Australasian-Pacific sector of the Southern Ocean in February 1999. Iron fertilisation of these High Nitrate Low Chlorophyll (HNLC) waters resulted in an increase in the photosynthetic competence (Fv/Fm) of the resident cells from around 0.20 to greater than 0.60 (i.e. close to the theoretical maximum) by days 10/11 of the experiment. Although a significant iron-mediated response in Fv/Fm was detected as early as 24 h after the initial enrichment, the increase in Fv/Fm to double ambient levels took 6 days. This response was five-fold slower that observed in iron enrichments (in situ and in vitro) in the HNLC waters of the sub-polar and Equatorial Pacific. During SOIREE, the photosynthetic competence of the resident phytoplankton in iron-enriched waters increased at dissolved iron levels above 0.2 nM, suggesting that iron limitation was alleviated at this concentration. Increases in Fv/Fm of cells within three algal size classes suggested that all taxa displayed a photosynthetic response to iron enrichment. Other physiological proxies of algal iron stress (such as flavodoxin expression) exhibited different trends than Fv/Fm during the time-course of SOIREE, the relationship between Fv/Fm, algal growth rate and such proxies in Southern Ocean waters is discussed. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Philip Boyd Edward Abraham P. W. Boyd E. R. Abraham |
spellingShingle |
Philip Boyd Edward Abraham P. W. Boyd E. R. Abraham Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
author_facet |
Philip Boyd Edward Abraham P. W. Boyd E. R. Abraham |
author_sort |
Philip Boyd |
title |
Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
title_short |
Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
title_full |
Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
title_fullStr |
Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
title_full_unstemmed |
Iron-mediated change in phytoplankton photosynthetic competence during SOIREE |
title_sort |
iron-mediated change in phytoplankton photosynthetic competence during soiree |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.5067 http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.23.5067 http://www.mcs.vuw.ac.nz/~abraham/Publications/SOIREE_FvFm.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766205794328510464 |