Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica.
Our study addresses how environmental variables, such as macronutrients concentrations, snow cover, carbonate chemistry and salinity affect the photophysiology and biomass of Antarctic sea-ice algae. We have measured vertical profiles of inorganic macronutrients (phosphate, nitrite + nitrate and sil...
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ftdoajarticles:oai:doaj.org/article:e93f1b385e4c402d87bfe88ebd794b7e 2023-05-15T13:32:09+02:00 Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. Anders Torstensson Agneta Fransson Kim Currie Angela Wulff Melissa Chierici 2018-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0195587 https://doaj.org/article/e93f1b385e4c402d87bfe88ebd794b7e EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC5892929?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0195587 https://doaj.org/article/e93f1b385e4c402d87bfe88ebd794b7e PLoS ONE, Vol 13, Iss 4, p e0195587 (2018) Medicine R Science Q article 2018 ftdoajarticles https://doi.org/10.1371/journal.pone.0195587 2022-12-31T14:11:31Z Our study addresses how environmental variables, such as macronutrients concentrations, snow cover, carbonate chemistry and salinity affect the photophysiology and biomass of Antarctic sea-ice algae. We have measured vertical profiles of inorganic macronutrients (phosphate, nitrite + nitrate and silicic acid) in summer sea ice and photophysiology of ice algal assemblages in the poorly studied Amundsen and Ross Seas sectors of the Southern Ocean. Brine-scaled bacterial abundance, chl a and macronutrient concentrations were often high in the ice and positively correlated with each other. Analysis of photosystem II rapid light curves showed that microalgal cells in samples with high phosphate and nitrite + nitrate concentrations had reduced maximum relative electron transport rate and photosynthetic efficiency. We also observed strong couplings of PSII parameters to snow depth, ice thickness and brine salinity, which highlights a wide range of photoacclimation in Antarctic pack-ice algae. It is likely that the pack ice was in a post-bloom situation during the late sea-ice season, with low photosynthetic efficiency and a high degree of nutrient accumulation occurring in the ice. In order to predict how key biogeochemical processes are affected by future changes in sea ice cover, such as in situ photosynthesis and nutrient cycling, we need to understand how physicochemical properties of sea ice affect the microbial community. Our results support existing hypothesis about sea-ice algal photophysiology, and provide additional observations on high nutrient concentrations in sea ice that could influence the planktonic communities as the ice is retreating. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice algae Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean PLOS ONE 13 4 e0195587 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Anders Torstensson Agneta Fransson Kim Currie Angela Wulff Melissa Chierici Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
topic_facet |
Medicine R Science Q |
description |
Our study addresses how environmental variables, such as macronutrients concentrations, snow cover, carbonate chemistry and salinity affect the photophysiology and biomass of Antarctic sea-ice algae. We have measured vertical profiles of inorganic macronutrients (phosphate, nitrite + nitrate and silicic acid) in summer sea ice and photophysiology of ice algal assemblages in the poorly studied Amundsen and Ross Seas sectors of the Southern Ocean. Brine-scaled bacterial abundance, chl a and macronutrient concentrations were often high in the ice and positively correlated with each other. Analysis of photosystem II rapid light curves showed that microalgal cells in samples with high phosphate and nitrite + nitrate concentrations had reduced maximum relative electron transport rate and photosynthetic efficiency. We also observed strong couplings of PSII parameters to snow depth, ice thickness and brine salinity, which highlights a wide range of photoacclimation in Antarctic pack-ice algae. It is likely that the pack ice was in a post-bloom situation during the late sea-ice season, with low photosynthetic efficiency and a high degree of nutrient accumulation occurring in the ice. In order to predict how key biogeochemical processes are affected by future changes in sea ice cover, such as in situ photosynthesis and nutrient cycling, we need to understand how physicochemical properties of sea ice affect the microbial community. Our results support existing hypothesis about sea-ice algal photophysiology, and provide additional observations on high nutrient concentrations in sea ice that could influence the planktonic communities as the ice is retreating. |
format |
Article in Journal/Newspaper |
author |
Anders Torstensson Agneta Fransson Kim Currie Angela Wulff Melissa Chierici |
author_facet |
Anders Torstensson Agneta Fransson Kim Currie Angela Wulff Melissa Chierici |
author_sort |
Anders Torstensson |
title |
Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
title_short |
Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
title_full |
Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
title_fullStr |
Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
title_full_unstemmed |
Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica. |
title_sort |
microalgal photophysiology and macronutrient distribution in summer sea ice in the amundsen and ross seas, antarctica. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2018 |
url |
https://doi.org/10.1371/journal.pone.0195587 https://doaj.org/article/e93f1b385e4c402d87bfe88ebd794b7e |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica ice algae Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice algae Sea ice Southern Ocean |
op_source |
PLoS ONE, Vol 13, Iss 4, p e0195587 (2018) |
op_relation |
http://europepmc.org/articles/PMC5892929?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0195587 https://doaj.org/article/e93f1b385e4c402d87bfe88ebd794b7e |
op_doi |
https://doi.org/10.1371/journal.pone.0195587 |
container_title |
PLOS ONE |
container_volume |
13 |
container_issue |
4 |
container_start_page |
e0195587 |
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1766024517545623552 |