Photosynthetic energy conversion efficiency in the West Antarctic Peninsula
Abstract The West Antarctic Peninsula (WAP) is a highly productive polar ecosystem where phytoplankton dynamics are regulated by intense bottom‐up control from light and iron availability. Rapid climate change along the WAP is driving shifts in the mixed layer depth and iron availability. Elucidatin...
Published in: | Limnology and Oceanography |
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Online Access: | http://dx.doi.org/10.1002/lno.11562 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11562 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.11562 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 |
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crwiley:10.1002/lno.11562 2024-10-13T14:03:03+00:00 Photosynthetic energy conversion efficiency in the West Antarctic Peninsula Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. Division of Polar Programs National Aeronautics and Space Administration 2020 http://dx.doi.org/10.1002/lno.11562 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11562 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.11562 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 65, issue 12, page 2912-2925 ISSN 0024-3590 1939-5590 journal-article 2020 crwiley https://doi.org/10.1002/lno.11562 2024-09-17T04:48:05Z Abstract The West Antarctic Peninsula (WAP) is a highly productive polar ecosystem where phytoplankton dynamics are regulated by intense bottom‐up control from light and iron availability. Rapid climate change along the WAP is driving shifts in the mixed layer depth and iron availability. Elucidating the relative role of each of these controls and their interactions is crucial for understanding of how primary productivity will change in coming decades. Using a combination of ultra‐high‐resolution variable chlorophyll fluorescence together with fluorescence lifetime analyses on the 2017 Palmer Long Term Ecological Research cruise, we mapped the temporal and spatial variability in phytoplankton photophysiology across the WAP. Highest photosynthetic energy conversion efficiencies and lowest fluorescence quantum yields were observed in iron replete coastal regions. Photosynthetic energy conversion efficiencies decreased by ~ 60% with a proportional increase in quantum yields of thermal dissipation and fluorescence on the outer continental shelf and slope. The combined analysis of variable fluorescence and lifetimes revealed that, in addition to the decrease in the fraction of inactive reaction centers, up to 20% of light harvesting chlorophyll‐protein antenna complexes were energetically uncoupled from photosystem II reaction centers in iron‐limited phytoplankton. These biophysical signatures strongly suggest severe iron limitation of photosynthesis in the surface waters along the continental slope of the WAP. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Wiley Online Library Antarctic Antarctic Peninsula Limnology and Oceanography 65 12 2912 2925 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The West Antarctic Peninsula (WAP) is a highly productive polar ecosystem where phytoplankton dynamics are regulated by intense bottom‐up control from light and iron availability. Rapid climate change along the WAP is driving shifts in the mixed layer depth and iron availability. Elucidating the relative role of each of these controls and their interactions is crucial for understanding of how primary productivity will change in coming decades. Using a combination of ultra‐high‐resolution variable chlorophyll fluorescence together with fluorescence lifetime analyses on the 2017 Palmer Long Term Ecological Research cruise, we mapped the temporal and spatial variability in phytoplankton photophysiology across the WAP. Highest photosynthetic energy conversion efficiencies and lowest fluorescence quantum yields were observed in iron replete coastal regions. Photosynthetic energy conversion efficiencies decreased by ~ 60% with a proportional increase in quantum yields of thermal dissipation and fluorescence on the outer continental shelf and slope. The combined analysis of variable fluorescence and lifetimes revealed that, in addition to the decrease in the fraction of inactive reaction centers, up to 20% of light harvesting chlorophyll‐protein antenna complexes were energetically uncoupled from photosystem II reaction centers in iron‐limited phytoplankton. These biophysical signatures strongly suggest severe iron limitation of photosynthesis in the surface waters along the continental slope of the WAP. |
author2 |
Division of Polar Programs National Aeronautics and Space Administration |
format |
Article in Journal/Newspaper |
author |
Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. |
spellingShingle |
Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
author_facet |
Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. |
author_sort |
Sherman, Jonathan |
title |
Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
title_short |
Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
title_full |
Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
title_fullStr |
Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
title_full_unstemmed |
Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
title_sort |
photosynthetic energy conversion efficiency in the west antarctic peninsula |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/lno.11562 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11562 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11562 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.11562 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11562 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Limnology and Oceanography volume 65, issue 12, page 2912-2925 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11562 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
12 |
container_start_page |
2912 |
op_container_end_page |
2925 |
_version_ |
1812819488473612288 |