Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh
Abstract Macroalgae such as kelp are important ecosystem engineers in the Polar Regions and potentially affected by freshening and ocean warming. The endemic Arctic kelp Laminaria solidungula might be particularly imperiled and become locally extinct from Arctic fjord systems in the future, since te...
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crspringernat:10.1007/s00300-020-02668-5 2023-05-15T14:55:56+02:00 Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh Diehl, Nora Karsten, Ulf Bischof, Kai Deutsche Forschungsgemeinschaft 2020 http://dx.doi.org/10.1007/s00300-020-02668-5 https://link.springer.com/content/pdf/10.1007/s00300-020-02668-5.pdf https://link.springer.com/article/10.1007/s00300-020-02668-5/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Polar Biology volume 43, issue 6, page 647-656 ISSN 0722-4060 1432-2056 General Agricultural and Biological Sciences journal-article 2020 crspringernat https://doi.org/10.1007/s00300-020-02668-5 2022-01-04T07:08:48Z Abstract Macroalgae such as kelp are important ecosystem engineers in the Polar Regions and potentially affected by freshening and ocean warming. The endemic Arctic kelp Laminaria solidungula might be particularly imperiled and become locally extinct from Arctic fjord systems in the future, since temperature increase is most pronounced in the Polar Regions. Additionally, increased temperatures cause glacier and sea ice melting and enhancing terrestrial run-off from snowfields, which eventually can result in hyposaline conditions in fjord systems. We conducted a multiple-stressor experiment at four temperatures (0, 5, 10, 15 °C) and two salinities ( S A 25, 35) to investigate the combined effects of increasing temperature and decreasing salinities on the physiological and biochemical status of young L. solidungula sporophytes. Both drivers had significant and interacting impacts, either in an additive or antagonistic way, dependent on the respective response variable. The maximum quantum yield of photosystem II ( F v / F m ) significantly declined with temperature increase and low salinity. Even though the absolute pigment content was not affected, the deepoxydation state of the xanthophyll cycle increased with intensified stress. Higher temperatures affected the C:N ratio significantly, mainly due to reduced nitrogen uptake, while S A 25 supported the nitrogen uptake, resulting in an attenuation of the effect. The concentration of mannitol decreased at S A 25. At control S A 35 mannitol level remained steady between 0 and 10 °C but significantly decreased at 15 °C. Conclusively, our results show that L. solidungula is very susceptible to both drivers of climate change, especially when they are combined. Implications to species ecology are discussed. Article in Journal/Newspaper Arctic Climate change Polar Biology Sea ice Springer Nature (via Crossref) Arctic Polar Biology 43 6 647 656 |
institution |
Open Polar |
collection |
Springer Nature (via Crossref) |
op_collection_id |
crspringernat |
language |
English |
topic |
General Agricultural and Biological Sciences |
spellingShingle |
General Agricultural and Biological Sciences Diehl, Nora Karsten, Ulf Bischof, Kai Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
topic_facet |
General Agricultural and Biological Sciences |
description |
Abstract Macroalgae such as kelp are important ecosystem engineers in the Polar Regions and potentially affected by freshening and ocean warming. The endemic Arctic kelp Laminaria solidungula might be particularly imperiled and become locally extinct from Arctic fjord systems in the future, since temperature increase is most pronounced in the Polar Regions. Additionally, increased temperatures cause glacier and sea ice melting and enhancing terrestrial run-off from snowfields, which eventually can result in hyposaline conditions in fjord systems. We conducted a multiple-stressor experiment at four temperatures (0, 5, 10, 15 °C) and two salinities ( S A 25, 35) to investigate the combined effects of increasing temperature and decreasing salinities on the physiological and biochemical status of young L. solidungula sporophytes. Both drivers had significant and interacting impacts, either in an additive or antagonistic way, dependent on the respective response variable. The maximum quantum yield of photosystem II ( F v / F m ) significantly declined with temperature increase and low salinity. Even though the absolute pigment content was not affected, the deepoxydation state of the xanthophyll cycle increased with intensified stress. Higher temperatures affected the C:N ratio significantly, mainly due to reduced nitrogen uptake, while S A 25 supported the nitrogen uptake, resulting in an attenuation of the effect. The concentration of mannitol decreased at S A 25. At control S A 35 mannitol level remained steady between 0 and 10 °C but significantly decreased at 15 °C. Conclusively, our results show that L. solidungula is very susceptible to both drivers of climate change, especially when they are combined. Implications to species ecology are discussed. |
author2 |
Deutsche Forschungsgemeinschaft |
format |
Article in Journal/Newspaper |
author |
Diehl, Nora Karsten, Ulf Bischof, Kai |
author_facet |
Diehl, Nora Karsten, Ulf Bischof, Kai |
author_sort |
Diehl, Nora |
title |
Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
title_short |
Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
title_full |
Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
title_fullStr |
Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
title_full_unstemmed |
Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula J. Agardh |
title_sort |
impacts of combined temperature and salinity stress on the endemic arctic brown seaweed laminaria solidungula j. agardh |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1007/s00300-020-02668-5 https://link.springer.com/content/pdf/10.1007/s00300-020-02668-5.pdf https://link.springer.com/article/10.1007/s00300-020-02668-5/fulltext.html |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Polar Biology Sea ice |
genre_facet |
Arctic Climate change Polar Biology Sea ice |
op_source |
Polar Biology volume 43, issue 6, page 647-656 ISSN 0722-4060 1432-2056 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00300-020-02668-5 |
container_title |
Polar Biology |
container_volume |
43 |
container_issue |
6 |
container_start_page |
647 |
op_container_end_page |
656 |
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1766327939212771328 |