Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica
To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons m-2 s-1) on growth, particulate...
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WILEY-BLACKWELL PUBLISHING
2016
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Online Access: | https://epic.awi.de/id/eprint/42798/ https://hdl.handle.net/10013/epic.49584 |
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ftawi:oai:epic.awi.de:42798 2023-05-15T13:40:28+02:00 Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica Trimborn, Scarlett Thoms, Silke Brenneis, Tina Heiden, Jasmin Beszteri, Sara Bischof, Kai 2016-12-25 https://epic.awi.de/id/eprint/42798/ https://hdl.handle.net/10013/epic.49584 unknown WILEY-BLACKWELL PUBLISHING Trimborn, S. orcid:0000-0003-1434-9927 , Thoms, S. , Brenneis, T. , Heiden, J. , Beszteri, S. and Bischof, K. (2016) Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica , Physiologia Plantarum . doi:10.1111/ppl.12539 <https://doi.org/10.1111/ppl.12539> , hdl:10013/epic.49584 EPIC3Physiologia Plantarum, WILEY-BLACKWELL PUBLISHING, ISSN: 0031-9317 Article isiRev 2016 ftawi https://doi.org/10.1111/ppl.12539 2021-12-24T15:42:17Z To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons m-2 s-1) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC cell-1 was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e.g. C. debilis) or POC content (e.g. F. kerguelensis) under OA in conjunction with high light. For both diatoms, also maximum quantum yields of PSII (Fv/Fm) were decreased under these conditions, indicating lowered photochemical efficiencies. To counteract the negative effects by OA and high light, the two diatoms showed diverging photoacclimation strategies. While cellular chlorophyll a and fucoxanthin contents were enhanced in C. debilis to potentially maximize light absorption, F. kerguelensis exhibited reduced chlorophyll a cell-1, increased disconnection of antennae from photosystem II reaction centers and strongly lowered absolute electron transport rates (ETR). The decline in ETRs in F. kerguelensis might be explained in terms of different species-specific strategies for tuning the available flux of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Overall, our results revealed that P. antarctica was more tolerant to OA and changes in irradiance than the two diatoms, which may have important implications for biogeochemical cycling. Article in Journal/Newspaper Antarc* Antarctica Ocean acidification Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Southern Ocean Physiologia Plantarum 160 2 155 170 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons m-2 s-1) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC cell-1 was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e.g. C. debilis) or POC content (e.g. F. kerguelensis) under OA in conjunction with high light. For both diatoms, also maximum quantum yields of PSII (Fv/Fm) were decreased under these conditions, indicating lowered photochemical efficiencies. To counteract the negative effects by OA and high light, the two diatoms showed diverging photoacclimation strategies. While cellular chlorophyll a and fucoxanthin contents were enhanced in C. debilis to potentially maximize light absorption, F. kerguelensis exhibited reduced chlorophyll a cell-1, increased disconnection of antennae from photosystem II reaction centers and strongly lowered absolute electron transport rates (ETR). The decline in ETRs in F. kerguelensis might be explained in terms of different species-specific strategies for tuning the available flux of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Overall, our results revealed that P. antarctica was more tolerant to OA and changes in irradiance than the two diatoms, which may have important implications for biogeochemical cycling. |
format |
Article in Journal/Newspaper |
author |
Trimborn, Scarlett Thoms, Silke Brenneis, Tina Heiden, Jasmin Beszteri, Sara Bischof, Kai |
spellingShingle |
Trimborn, Scarlett Thoms, Silke Brenneis, Tina Heiden, Jasmin Beszteri, Sara Bischof, Kai Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
author_facet |
Trimborn, Scarlett Thoms, Silke Brenneis, Tina Heiden, Jasmin Beszteri, Sara Bischof, Kai |
author_sort |
Trimborn, Scarlett |
title |
Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
title_short |
Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
title_full |
Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
title_fullStr |
Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
title_full_unstemmed |
Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica |
title_sort |
two southern ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte phaeocystis antarctica |
publisher |
WILEY-BLACKWELL PUBLISHING |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42798/ https://hdl.handle.net/10013/epic.49584 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctica Ocean acidification Southern Ocean |
op_source |
EPIC3Physiologia Plantarum, WILEY-BLACKWELL PUBLISHING, ISSN: 0031-9317 |
op_relation |
Trimborn, S. orcid:0000-0003-1434-9927 , Thoms, S. , Brenneis, T. , Heiden, J. , Beszteri, S. and Bischof, K. (2016) Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica , Physiologia Plantarum . doi:10.1111/ppl.12539 <https://doi.org/10.1111/ppl.12539> , hdl:10013/epic.49584 |
op_doi |
https://doi.org/10.1111/ppl.12539 |
container_title |
Physiologia Plantarum |
container_volume |
160 |
container_issue |
2 |
container_start_page |
155 |
op_container_end_page |
170 |
_version_ |
1766135368625684480 |