Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom
Thalassiosira hyalina and Nitzschia frigida are important members of Arctic pelagic and sympagic (sea‐ice‐associated) diatom communities. We investigated the effects of light stress (shift from 20 to 380 µmol photons m−2 s−1, resembling upwelling or ice break‐up) under contemporary and future pCO2 (...
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WILEY-BLACKWELL PUBLISHING
2020
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Online Access: | https://epic.awi.de/id/eprint/51503/ https://epic.awi.de/id/eprint/51503/1/Kvernvik-NewPhytol-2020.pdf https://hdl.handle.net/10013/epic.84aa70e2-36ac-4f7a-be90-36910e901647 |
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ftawi:oai:epic.awi.de:51503 2024-09-15T17:51:46+00:00 Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom Kvernvik, Ane Rokitta, Sebastian Leu, Eva Harms, Lars Gabrielsen, T.M. Rost, Bjoern Hoppe, Clara 2020 application/pdf https://epic.awi.de/id/eprint/51503/ https://epic.awi.de/id/eprint/51503/1/Kvernvik-NewPhytol-2020.pdf https://hdl.handle.net/10013/epic.84aa70e2-36ac-4f7a-be90-36910e901647 unknown WILEY-BLACKWELL PUBLISHING https://epic.awi.de/id/eprint/51503/1/Kvernvik-NewPhytol-2020.pdf Kvernvik, A. orcid:0000-0002-7678-5233 , Rokitta, S. orcid:0000-0002-7540-9033 , Leu, E. orcid:0000-0002-5328-3396 , Harms, L. orcid:0000-0001-7620-0613 , Gabrielsen, T. orcid:0000-0001-5801-4569 , Rost, B. orcid:0000-0001-5452-5505 and Hoppe, C. orcid:0000-0002-2509-0546 (2020) Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom , New Phytologist . doi:10.1111/nph.16501 <https://doi.org/10.1111/nph.16501> , hdl:10013/epic.84aa70e2-36ac-4f7a-be90-36910e901647 EPIC3New Phytologist, WILEY-BLACKWELL PUBLISHING, ISSN: 0028-646X Article isiRev 2020 ftawi https://doi.org/10.1111/nph.16501 2024-06-24T04:23:24Z Thalassiosira hyalina and Nitzschia frigida are important members of Arctic pelagic and sympagic (sea‐ice‐associated) diatom communities. We investigated the effects of light stress (shift from 20 to 380 µmol photons m−2 s−1, resembling upwelling or ice break‐up) under contemporary and future pCO2 (400 vs 1000 µatm). The responses in growth, elemental composition, pigmentation and photophysiology were followed over 120 h and are discussed together with underlying gene expression patterns. Stress response and subsequent re-acclimation were efficiently facilitated by T. hyalina, which showed only moderate changes in photophysiology and elemental composition, and thrived under high light after 120 h. In N. frigida, photochemical damage and oxidative stress appeared to outweigh cellular defenses, causing dysfunctional photophysiology and reduced growth. pCO2 alone did not specifically influence gene expression, but amplified the transcriptomic reactions to light stress, indicating that pCO2 affects metabolic equilibria rather than sensitive genes. Large differences in acclimation capacities towards high light and high pCO2 between T. hyalina and N. frigida indicate species‐specific mechanisms in coping with the two stressors, which may reflect their respective ecological niches. This could potentially alter the balance between sympagic and pelagic primary production in a future Arctic. Article in Journal/Newspaper Arctic Ocean acidification Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) New Phytologist 226 6 1708 1724 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Thalassiosira hyalina and Nitzschia frigida are important members of Arctic pelagic and sympagic (sea‐ice‐associated) diatom communities. We investigated the effects of light stress (shift from 20 to 380 µmol photons m−2 s−1, resembling upwelling or ice break‐up) under contemporary and future pCO2 (400 vs 1000 µatm). The responses in growth, elemental composition, pigmentation and photophysiology were followed over 120 h and are discussed together with underlying gene expression patterns. Stress response and subsequent re-acclimation were efficiently facilitated by T. hyalina, which showed only moderate changes in photophysiology and elemental composition, and thrived under high light after 120 h. In N. frigida, photochemical damage and oxidative stress appeared to outweigh cellular defenses, causing dysfunctional photophysiology and reduced growth. pCO2 alone did not specifically influence gene expression, but amplified the transcriptomic reactions to light stress, indicating that pCO2 affects metabolic equilibria rather than sensitive genes. Large differences in acclimation capacities towards high light and high pCO2 between T. hyalina and N. frigida indicate species‐specific mechanisms in coping with the two stressors, which may reflect their respective ecological niches. This could potentially alter the balance between sympagic and pelagic primary production in a future Arctic. |
format |
Article in Journal/Newspaper |
author |
Kvernvik, Ane Rokitta, Sebastian Leu, Eva Harms, Lars Gabrielsen, T.M. Rost, Bjoern Hoppe, Clara |
spellingShingle |
Kvernvik, Ane Rokitta, Sebastian Leu, Eva Harms, Lars Gabrielsen, T.M. Rost, Bjoern Hoppe, Clara Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
author_facet |
Kvernvik, Ane Rokitta, Sebastian Leu, Eva Harms, Lars Gabrielsen, T.M. Rost, Bjoern Hoppe, Clara |
author_sort |
Kvernvik, Ane |
title |
Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
title_short |
Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
title_full |
Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
title_fullStr |
Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
title_full_unstemmed |
Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom |
title_sort |
higher sensitivity towards light stress and ocean acidification in an arctic sea‐ice‐associated diatom compared to a pelagic diatom |
publisher |
WILEY-BLACKWELL PUBLISHING |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/51503/ https://epic.awi.de/id/eprint/51503/1/Kvernvik-NewPhytol-2020.pdf https://hdl.handle.net/10013/epic.84aa70e2-36ac-4f7a-be90-36910e901647 |
genre |
Arctic Ocean acidification Sea ice |
genre_facet |
Arctic Ocean acidification Sea ice |
op_source |
EPIC3New Phytologist, WILEY-BLACKWELL PUBLISHING, ISSN: 0028-646X |
op_relation |
https://epic.awi.de/id/eprint/51503/1/Kvernvik-NewPhytol-2020.pdf Kvernvik, A. orcid:0000-0002-7678-5233 , Rokitta, S. orcid:0000-0002-7540-9033 , Leu, E. orcid:0000-0002-5328-3396 , Harms, L. orcid:0000-0001-7620-0613 , Gabrielsen, T. orcid:0000-0001-5801-4569 , Rost, B. orcid:0000-0001-5452-5505 and Hoppe, C. orcid:0000-0002-2509-0546 (2020) Higher sensitivity towards light stress and ocean acidification in an Arctic sea‐ice‐associated diatom compared to a pelagic diatom , New Phytologist . doi:10.1111/nph.16501 <https://doi.org/10.1111/nph.16501> , hdl:10013/epic.84aa70e2-36ac-4f7a-be90-36910e901647 |
op_doi |
https://doi.org/10.1111/nph.16501 |
container_title |
New Phytologist |
container_volume |
226 |
container_issue |
6 |
container_start_page |
1708 |
op_container_end_page |
1724 |
_version_ |
1810293755420344320 |