Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance
Abstract The Southern Ocean, a globally important CO 2 sink, is one of the most susceptible regions in the world to climate change. Phytoplankton of the coastal shelf waters around the Western Antarctic Peninsula have been experiencing rapid warming over the past decades and current ongoing climatic...
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crwiley:10.1002/lno.12392 2024-06-02T07:58:34+00:00 Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance Camoying, Marianne G. Trimborn, Scarlett KAAD 2023 http://dx.doi.org/10.1002/lno.12392 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12392 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Limnology and Oceanography volume 68, issue 8, page 1880-1894 ISSN 0024-3590 1939-5590 journal-article 2023 crwiley https://doi.org/10.1002/lno.12392 2024-05-03T11:35:27Z Abstract The Southern Ocean, a globally important CO 2 sink, is one of the most susceptible regions in the world to climate change. Phytoplankton of the coastal shelf waters around the Western Antarctic Peninsula have been experiencing rapid warming over the past decades and current ongoing climatic changes will expose them to ocean acidification and high light intensities due to increasing stratification. We conducted a multiple‐stressor experiment to evaluate the response of the still poorly studied key Antarctic cryptophyte species Geminigera cryophila to warming in combination with ocean acidification and high irradiance. Based on the thermal growth response of G. cryophila , we grew the cryptophyte at suboptimal (2°C) and optimal (4°C) temperatures in combination with two light intensities (medium light: 100 μ mol photons m −2 s −1 and high light [HL]: 500 μ mol photons m −2 s −1 ) under ambient (400 μ atm pCO 2 ) and high pCO 2 (1000 μ atm pCO 2 ) conditions. Our results reveal that G. cryophila was not susceptible to high pCO 2 , but was strongly affected by HL at 2°C, as both growth and carbon fixation were significantly reduced. In comparison, warming up to 4°C stimulated the growth of the cryptophyte and even alleviated the previously observed negative effects of HL at 2°C. When grown, however, at temperatures above 4°C, the cryptophyte already reached its maximal thermal limit at 8°C, pointing out its vulnerability toward even higher temperatures. Hence, our results clearly indicate that warming and high light and not pCO 2 control the growth of G. cryophila . Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean Wiley Online Library Antarctic Antarctic Peninsula Southern Ocean Limnology and Oceanography 68 8 1880 1894 |
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English |
description |
Abstract The Southern Ocean, a globally important CO 2 sink, is one of the most susceptible regions in the world to climate change. Phytoplankton of the coastal shelf waters around the Western Antarctic Peninsula have been experiencing rapid warming over the past decades and current ongoing climatic changes will expose them to ocean acidification and high light intensities due to increasing stratification. We conducted a multiple‐stressor experiment to evaluate the response of the still poorly studied key Antarctic cryptophyte species Geminigera cryophila to warming in combination with ocean acidification and high irradiance. Based on the thermal growth response of G. cryophila , we grew the cryptophyte at suboptimal (2°C) and optimal (4°C) temperatures in combination with two light intensities (medium light: 100 μ mol photons m −2 s −1 and high light [HL]: 500 μ mol photons m −2 s −1 ) under ambient (400 μ atm pCO 2 ) and high pCO 2 (1000 μ atm pCO 2 ) conditions. Our results reveal that G. cryophila was not susceptible to high pCO 2 , but was strongly affected by HL at 2°C, as both growth and carbon fixation were significantly reduced. In comparison, warming up to 4°C stimulated the growth of the cryptophyte and even alleviated the previously observed negative effects of HL at 2°C. When grown, however, at temperatures above 4°C, the cryptophyte already reached its maximal thermal limit at 8°C, pointing out its vulnerability toward even higher temperatures. Hence, our results clearly indicate that warming and high light and not pCO 2 control the growth of G. cryophila . |
author2 |
KAAD |
format |
Article in Journal/Newspaper |
author |
Camoying, Marianne G. Trimborn, Scarlett |
spellingShingle |
Camoying, Marianne G. Trimborn, Scarlett Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
author_facet |
Camoying, Marianne G. Trimborn, Scarlett |
author_sort |
Camoying, Marianne G. |
title |
Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
title_short |
Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
title_full |
Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
title_fullStr |
Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
title_full_unstemmed |
Physiological response of an Antarctic cryptophyte to increasing temperature, CO 2 , and irradiance |
title_sort |
physiological response of an antarctic cryptophyte to increasing temperature, co 2 , and irradiance |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/lno.12392 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12392 |
geographic |
Antarctic Antarctic Peninsula Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean |
op_source |
Limnology and Oceanography volume 68, issue 8, page 1880-1894 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12392 |
container_title |
Limnology and Oceanography |
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68 |
container_issue |
8 |
container_start_page |
1880 |
op_container_end_page |
1894 |
_version_ |
1800741942897672192 |