Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice
Microorganisms confined to annual sea ice in the Southern Ocean are exposed to highly variable oxygen and carbonate chemistry dynamics because of the seasonal increase in biomass and limited exchange with the underlying water column. For sea-ice algae, physiological stress is likely to be exacerbate...
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Norwegian Polar Institute
2018
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Online Access: | https://doi.org/10.1080/17518369.2018.1438696 https://doaj.org/article/7b5c7a141b8849289d19ab068e12463f |
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ftdoajarticles:oai:doaj.org/article:7b5c7a141b8849289d19ab068e12463f 2023-05-15T14:03:34+02:00 Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice Katerina Castrisios Andrew Martin Marius N. Müller Fraser Kennedy Andrew McMinn Ken G. Ryan 2018-01-01T00:00:00Z https://doi.org/10.1080/17518369.2018.1438696 https://doaj.org/article/7b5c7a141b8849289d19ab068e12463f EN eng Norwegian Polar Institute http://dx.doi.org/10.1080/17518369.2018.1438696 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2018.1438696 https://doaj.org/article/7b5c7a141b8849289d19ab068e12463f Polar Research, Vol 37, Iss 1 (2018) Antarctica imaging-PAM photophysiology carbonate chemistry Environmental sciences GE1-350 Oceanography GC1-1581 article 2018 ftdoajarticles https://doi.org/10.1080/17518369.2018.1438696 2022-12-31T08:46:02Z Microorganisms confined to annual sea ice in the Southern Ocean are exposed to highly variable oxygen and carbonate chemistry dynamics because of the seasonal increase in biomass and limited exchange with the underlying water column. For sea-ice algae, physiological stress is likely to be exacerbated when the ice melts; however, variation in carbonate speciation has rarely been monitored during this important state-transition. Using pulse amplitude modulated fluorometry (Imaging-PAM, Walz), we documented in situ changes in the maximum quantum yield of photosystem II (Fv/Fm) of sea-ice algae melting out into seawater with initial pH values ranging from 7.66 to 6.39. Although the process of ice-melt elevated seawater pH by 0.2–0.55 units, we observed a decrease in Fv/Fm between 0.02 and 0.06 for each unit drop in pH during real-time fluorescence imaging. These results are considered preliminary but provide context for including carbonate chemistry monitoring in the design of future sea ice state-transition experiments. Imaging-PAM is a reliable technology for determining Fv/Fm, but is of limited use for obtaining additional photosynthetic parameters when imaging melting ice. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice algae Polar Research Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Polar Research 37 1 1438696 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica imaging-PAM photophysiology carbonate chemistry Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Antarctica imaging-PAM photophysiology carbonate chemistry Environmental sciences GE1-350 Oceanography GC1-1581 Katerina Castrisios Andrew Martin Marius N. Müller Fraser Kennedy Andrew McMinn Ken G. Ryan Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
topic_facet |
Antarctica imaging-PAM photophysiology carbonate chemistry Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
Microorganisms confined to annual sea ice in the Southern Ocean are exposed to highly variable oxygen and carbonate chemistry dynamics because of the seasonal increase in biomass and limited exchange with the underlying water column. For sea-ice algae, physiological stress is likely to be exacerbated when the ice melts; however, variation in carbonate speciation has rarely been monitored during this important state-transition. Using pulse amplitude modulated fluorometry (Imaging-PAM, Walz), we documented in situ changes in the maximum quantum yield of photosystem II (Fv/Fm) of sea-ice algae melting out into seawater with initial pH values ranging from 7.66 to 6.39. Although the process of ice-melt elevated seawater pH by 0.2–0.55 units, we observed a decrease in Fv/Fm between 0.02 and 0.06 for each unit drop in pH during real-time fluorescence imaging. These results are considered preliminary but provide context for including carbonate chemistry monitoring in the design of future sea ice state-transition experiments. Imaging-PAM is a reliable technology for determining Fv/Fm, but is of limited use for obtaining additional photosynthetic parameters when imaging melting ice. |
format |
Article in Journal/Newspaper |
author |
Katerina Castrisios Andrew Martin Marius N. Müller Fraser Kennedy Andrew McMinn Ken G. Ryan |
author_facet |
Katerina Castrisios Andrew Martin Marius N. Müller Fraser Kennedy Andrew McMinn Ken G. Ryan |
author_sort |
Katerina Castrisios |
title |
Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
title_short |
Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
title_full |
Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
title_fullStr |
Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
title_full_unstemmed |
Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
title_sort |
response of antarctic sea-ice algae to an experimental decrease in ph: a preliminary analysis from chlorophyll fluorescence imaging of melting ice |
publisher |
Norwegian Polar Institute |
publishDate |
2018 |
url |
https://doi.org/10.1080/17518369.2018.1438696 https://doaj.org/article/7b5c7a141b8849289d19ab068e12463f |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica ice algae Polar Research Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice algae Polar Research Sea ice Southern Ocean |
op_source |
Polar Research, Vol 37, Iss 1 (2018) |
op_relation |
http://dx.doi.org/10.1080/17518369.2018.1438696 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2018.1438696 https://doaj.org/article/7b5c7a141b8849289d19ab068e12463f |
op_doi |
https://doi.org/10.1080/17518369.2018.1438696 |
container_title |
Polar Research |
container_volume |
37 |
container_issue |
1 |
container_start_page |
1438696 |
_version_ |
1766274261753790464 |