Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event
Strong physical disturbances in the surface ocean vertically redistribute plankton and lead to new relationships between organisms and their growth environment. Entrainment of phytoplankton to deeper depths decreases light exposure while stratification exposes cells in the surface mixing layer to hi...
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Online Access: | https://doi.org/10.3389/fmars.2018.00209 https://doaj.org/article/e38aed52c92f44cc8c1c1f72fca9847d |
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ftdoajarticles:oai:doaj.org/article:e38aed52c92f44cc8c1c1f72fca9847d 2023-05-15T18:28:19+02:00 Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event Jason R. Graff Michael J. Behrenfeld 2018-06-01T00:00:00Z https://doi.org/10.3389/fmars.2018.00209 https://doaj.org/article/e38aed52c92f44cc8c1c1f72fca9847d EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2018.00209/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00209 https://doaj.org/article/e38aed52c92f44cc8c1c1f72fca9847d Frontiers in Marine Science, Vol 5 (2018) phytoplankton photoacclimation growth irradiance FRRf flow cytometry deep mixing Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2018 ftdoajarticles https://doi.org/10.3389/fmars.2018.00209 2022-12-31T09:38:06Z Strong physical disturbances in the surface ocean vertically redistribute plankton and lead to new relationships between organisms and their growth environment. Entrainment of phytoplankton to deeper depths decreases light exposure while stratification exposes cells in the surface mixing layer to higher light. Phytoplankton can rapidly respond to alterations in growth irradiance (Eg) using photoacclimation processes such as nonphotochemical quenching and alterations in pigments and other macromolecules. While it is common to observe photophysiological responses to shifts in growth irradiance in the laboratory it is rare that a study is able to document these processes in the field in a lagrangian framework. We were able to follow a natural phytoplankton community for 4 days and observe rapid photophysiological responses and net accumulation patterns of biomass down to 200 m following a deep mixing and restratification event in the subarctic Atlantic ocean. Applying flow cytometry and fast rate repetition fluorometry (FRRf) we report on the photoacclimation responses of multiple taxonomic groups in relation to the rapidly evolving physical environment. Significant stratification occurred following the deep entrainment event, isolating cells within an actively mixing and shoaling surface layer, the lower euphotic zone, and below the photic zone. Distinct differences in patterns of accumulation and photoacclimation are apparent between these depths of disparate light histories. Photoacclimation patterns are generally consistent between Synechococcus, picoeukaryote, and nanoeukaryote groups yet diel patterns and variability in the range of photoacclimation suggest divergent physiology. Results from continuous FRRf measurements collected on bulk seawater show a decrease in the number of photosystem II reaction centers and a concurrent increase in the functional cross section with implications for maintaining photosynthetic rates throughout the mixed layer. Understanding group specific differences as well as bulk ... Article in Journal/Newspaper Subarctic Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
phytoplankton photoacclimation growth irradiance FRRf flow cytometry deep mixing Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
phytoplankton photoacclimation growth irradiance FRRf flow cytometry deep mixing Science Q General. Including nature conservation geographical distribution QH1-199.5 Jason R. Graff Michael J. Behrenfeld Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
topic_facet |
phytoplankton photoacclimation growth irradiance FRRf flow cytometry deep mixing Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Strong physical disturbances in the surface ocean vertically redistribute plankton and lead to new relationships between organisms and their growth environment. Entrainment of phytoplankton to deeper depths decreases light exposure while stratification exposes cells in the surface mixing layer to higher light. Phytoplankton can rapidly respond to alterations in growth irradiance (Eg) using photoacclimation processes such as nonphotochemical quenching and alterations in pigments and other macromolecules. While it is common to observe photophysiological responses to shifts in growth irradiance in the laboratory it is rare that a study is able to document these processes in the field in a lagrangian framework. We were able to follow a natural phytoplankton community for 4 days and observe rapid photophysiological responses and net accumulation patterns of biomass down to 200 m following a deep mixing and restratification event in the subarctic Atlantic ocean. Applying flow cytometry and fast rate repetition fluorometry (FRRf) we report on the photoacclimation responses of multiple taxonomic groups in relation to the rapidly evolving physical environment. Significant stratification occurred following the deep entrainment event, isolating cells within an actively mixing and shoaling surface layer, the lower euphotic zone, and below the photic zone. Distinct differences in patterns of accumulation and photoacclimation are apparent between these depths of disparate light histories. Photoacclimation patterns are generally consistent between Synechococcus, picoeukaryote, and nanoeukaryote groups yet diel patterns and variability in the range of photoacclimation suggest divergent physiology. Results from continuous FRRf measurements collected on bulk seawater show a decrease in the number of photosystem II reaction centers and a concurrent increase in the functional cross section with implications for maintaining photosynthetic rates throughout the mixed layer. Understanding group specific differences as well as bulk ... |
format |
Article in Journal/Newspaper |
author |
Jason R. Graff Michael J. Behrenfeld |
author_facet |
Jason R. Graff Michael J. Behrenfeld |
author_sort |
Jason R. Graff |
title |
Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
title_short |
Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
title_full |
Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
title_fullStr |
Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
title_full_unstemmed |
Photoacclimation Responses in Subarctic Atlantic Phytoplankton Following a Natural Mixing-Restratification Event |
title_sort |
photoacclimation responses in subarctic atlantic phytoplankton following a natural mixing-restratification event |
publisher |
Frontiers Media S.A. |
publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00209 https://doaj.org/article/e38aed52c92f44cc8c1c1f72fca9847d |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Frontiers in Marine Science, Vol 5 (2018) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2018.00209/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00209 https://doaj.org/article/e38aed52c92f44cc8c1c1f72fca9847d |
op_doi |
https://doi.org/10.3389/fmars.2018.00209 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
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1766210752472940544 |