Photosynthetic energy conversion efficiency in the West Antarctic Peninsula
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 rel...
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ftpubmed:oai:pubmedcentral.nih.gov:7754432 2023-05-15T13:47:25+02:00 Photosynthetic energy conversion efficiency in the West Antarctic Peninsula Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. 2020-07-20 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7754432/ http://www.ncbi.nlm.nih.gov/pubmed/33380749 https://doi.org/10.1002/lno.11562 en eng John Wiley & Sons, Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7754432/ http://www.ncbi.nlm.nih.gov/pubmed/33380749 http://dx.doi.org/10.1002/lno.11562 © 2020 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC. on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Limnol Oceanogr Articles Text 2020 ftpubmed https://doi.org/10.1002/lno.11562 2021-01-03T01:37:25Z 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. Text Antarc* Antarctic Antarctic Peninsula PubMed Central (PMC) Antarctic Antarctic Peninsula Limnology and Oceanography 65 12 2912 2925 |
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Articles Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. Photosynthetic energy conversion efficiency in the West Antarctic Peninsula |
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description |
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. |
format |
Text |
author |
Sherman, Jonathan Gorbunov, Maxim Y. Schofield, Oscar Falkowski, Paul G. |
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 |
John Wiley & Sons, Inc. |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7754432/ http://www.ncbi.nlm.nih.gov/pubmed/33380749 https://doi.org/10.1002/lno.11562 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
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Antarc* Antarctic Antarctic Peninsula |
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Antarc* Antarctic Antarctic Peninsula |
op_source |
Limnol Oceanogr |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7754432/ http://www.ncbi.nlm.nih.gov/pubmed/33380749 http://dx.doi.org/10.1002/lno.11562 |
op_rights |
© 2020 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC. on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
op_doi |
https://doi.org/10.1002/lno.11562 |
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Limnology and Oceanography |
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65 |
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12 |
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2912 |
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2925 |
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1766247085285310464 |