Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario
Abstract Kelps (Phaeophyceae, Laminariales) are ecosystem engineers along Arctic rocky shores. With ongoing climate change, the frequency and intensity of marine heatwaves are increasing. Further, extensive meltwater plumes darken Arctic fjords. Assessing the effect of a sudden temperature increase...
Published in: | Cambridge Prisms: Coastal Futures |
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Online Access: | http://dx.doi.org/10.1017/cft.2024.5 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S2754720524000052 |
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crcambridgeupr:10.1017/cft.2024.5 2024-04-28T08:06:42+00:00 Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario Niedzwiedz, Sarina Vonnahme, Tobias Reiner Juul-Pedersen, Thomas Bischof, Kai Diehl, Nora Horizon 2020 Framework Programme 2024 http://dx.doi.org/10.1017/cft.2024.5 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S2754720524000052 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0 Cambridge Prisms: Coastal Futures volume 2 ISSN 2754-7205 journal-article 2024 crcambridgeupr https://doi.org/10.1017/cft.2024.5 2024-04-02T06:54:37Z Abstract Kelps (Phaeophyceae, Laminariales) are ecosystem engineers along Arctic rocky shores. With ongoing climate change, the frequency and intensity of marine heatwaves are increasing. Further, extensive meltwater plumes darken Arctic fjords. Assessing the effect of a sudden temperature increase at the cold-distribution limit of cold-temperate kelp species, we compared the responses of two kelp species ( Agarum clathratum , Saccharina latissima ) to realistic Arctic summer heatwave scenarios (4–10°C) under low- and high-light conditions (3; 120 μmol photons m −2 s −1 ) for 12 days. We found high-light causing physiological stress in both species (e.g., lower photosynthetic efficiency of photosystem II), which was enhanced by cold and mitigated by warm temperatures. Under low-light conditions, we found no temperature response, probably due to light limitation. Both species acclimated to light variations by adjusting their chlorophyll a concentration, meeting cellular energy requirements. A. clathratum had ~150% higher phlorotannin concentrations than S. latissima , possibly acting as herbivore-deterrent. Our findings suggest competitive advantages of kelps on different Arctic coasts with ongoing warming: A. clathratum has advantages in future areas, with low-light intensities, and possibly high grazing pressure and S. latissima in areas with high-light intensities and low grazing pressure. Species composition changes might have cascading consequences on ecosystem functioning. Article in Journal/Newspaper Arctic Climate change Cambridge University Press Cambridge Prisms: Coastal Futures 2 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Kelps (Phaeophyceae, Laminariales) are ecosystem engineers along Arctic rocky shores. With ongoing climate change, the frequency and intensity of marine heatwaves are increasing. Further, extensive meltwater plumes darken Arctic fjords. Assessing the effect of a sudden temperature increase at the cold-distribution limit of cold-temperate kelp species, we compared the responses of two kelp species ( Agarum clathratum , Saccharina latissima ) to realistic Arctic summer heatwave scenarios (4–10°C) under low- and high-light conditions (3; 120 μmol photons m −2 s −1 ) for 12 days. We found high-light causing physiological stress in both species (e.g., lower photosynthetic efficiency of photosystem II), which was enhanced by cold and mitigated by warm temperatures. Under low-light conditions, we found no temperature response, probably due to light limitation. Both species acclimated to light variations by adjusting their chlorophyll a concentration, meeting cellular energy requirements. A. clathratum had ~150% higher phlorotannin concentrations than S. latissima , possibly acting as herbivore-deterrent. Our findings suggest competitive advantages of kelps on different Arctic coasts with ongoing warming: A. clathratum has advantages in future areas, with low-light intensities, and possibly high grazing pressure and S. latissima in areas with high-light intensities and low grazing pressure. Species composition changes might have cascading consequences on ecosystem functioning. |
author2 |
Horizon 2020 Framework Programme |
format |
Article in Journal/Newspaper |
author |
Niedzwiedz, Sarina Vonnahme, Tobias Reiner Juul-Pedersen, Thomas Bischof, Kai Diehl, Nora |
spellingShingle |
Niedzwiedz, Sarina Vonnahme, Tobias Reiner Juul-Pedersen, Thomas Bischof, Kai Diehl, Nora Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
author_facet |
Niedzwiedz, Sarina Vonnahme, Tobias Reiner Juul-Pedersen, Thomas Bischof, Kai Diehl, Nora |
author_sort |
Niedzwiedz, Sarina |
title |
Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
title_short |
Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
title_full |
Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
title_fullStr |
Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
title_full_unstemmed |
Light-mediated temperature susceptibility of kelp species ( Agarum clathratum , Saccharina latissima ) in an Arctic summer heatwave scenario |
title_sort |
light-mediated temperature susceptibility of kelp species ( agarum clathratum , saccharina latissima ) in an arctic summer heatwave scenario |
publisher |
Cambridge University Press (CUP) |
publishDate |
2024 |
url |
http://dx.doi.org/10.1017/cft.2024.5 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S2754720524000052 |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Cambridge Prisms: Coastal Futures volume 2 ISSN 2754-7205 |
op_rights |
http://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1017/cft.2024.5 |
container_title |
Cambridge Prisms: Coastal Futures |
container_volume |
2 |
_version_ |
1797576085673607168 |