Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms
Abstract Sea ice retreat, changing stratification, and ocean acidification are fundamentally changing the light availability and physico‐chemical conditions for primary producers in the Arctic Ocean. However, detailed studies on ecophysiological strategies and performance of key species in the pelag...
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crwiley:10.1002/lno.12174 2024-09-15T17:54:07+00:00 Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms Wolf, Klara K. E. Rokitta, Sebastian D. Hoppe, Clara J. M. Rost, Björn 2022 http://dx.doi.org/10.1002/lno.12174 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12174 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12174 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12174 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 67, issue 9, page 1895-1910 ISSN 0024-3590 1939-5590 journal-article 2022 crwiley https://doi.org/10.1002/lno.12174 2024-08-20T04:12:44Z Abstract Sea ice retreat, changing stratification, and ocean acidification are fundamentally changing the light availability and physico‐chemical conditions for primary producers in the Arctic Ocean. However, detailed studies on ecophysiological strategies and performance of key species in the pelagic and ice‐associated habitat remain scarce. Therefore, we investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica toward elevated irradiance and CO 2 partial pressures (pCO 2 ). Next to growth, elemental composition, and biomass production, we assessed detailed photophysiological responses through fluorometry and gas‐flux measurements, including respiration and carbon acquisition. In the pelagic T. hyalina , growth rates remained high in all treatments and biomass production increased strongly with light. Even under low irradiances cells maintained a high‐light acclimated state, allowing them to opportunistically utilize high irradiances by means of a highly plastic photosynthetic machinery and carbon uptake. The ice‐associated M. arctica proved to be less plastic and more specialized on low‐light. Its acclimation to high irradiances was characterized by minimizing photon harvest and photosynthetic efficiency, which led to lowered growth. Comparably low growth rates and strong silification advocate a strategy of persistence rather than of fast proliferation, which is also in line with the observed formation of resting stages under low‐light conditions. In both species, responses to elevated pCO 2 were comparably minor. Although both diatom species persisted under the applied conditions, their competitive abilities and strategies differ strongly. With the anticipated extension of Arctic pelagic habitats, flexible high‐light specialists like T. hyalina seem to face a brighter future . Article in Journal/Newspaper Arctic Ocean Ocean acidification Sea ice Wiley Online Library Limnology and Oceanography 67 9 1895 1910 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Sea ice retreat, changing stratification, and ocean acidification are fundamentally changing the light availability and physico‐chemical conditions for primary producers in the Arctic Ocean. However, detailed studies on ecophysiological strategies and performance of key species in the pelagic and ice‐associated habitat remain scarce. Therefore, we investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica toward elevated irradiance and CO 2 partial pressures (pCO 2 ). Next to growth, elemental composition, and biomass production, we assessed detailed photophysiological responses through fluorometry and gas‐flux measurements, including respiration and carbon acquisition. In the pelagic T. hyalina , growth rates remained high in all treatments and biomass production increased strongly with light. Even under low irradiances cells maintained a high‐light acclimated state, allowing them to opportunistically utilize high irradiances by means of a highly plastic photosynthetic machinery and carbon uptake. The ice‐associated M. arctica proved to be less plastic and more specialized on low‐light. Its acclimation to high irradiances was characterized by minimizing photon harvest and photosynthetic efficiency, which led to lowered growth. Comparably low growth rates and strong silification advocate a strategy of persistence rather than of fast proliferation, which is also in line with the observed formation of resting stages under low‐light conditions. In both species, responses to elevated pCO 2 were comparably minor. Although both diatom species persisted under the applied conditions, their competitive abilities and strategies differ strongly. With the anticipated extension of Arctic pelagic habitats, flexible high‐light specialists like T. hyalina seem to face a brighter future . |
format |
Article in Journal/Newspaper |
author |
Wolf, Klara K. E. Rokitta, Sebastian D. Hoppe, Clara J. M. Rost, Björn |
spellingShingle |
Wolf, Klara K. E. Rokitta, Sebastian D. Hoppe, Clara J. M. Rost, Björn Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
author_facet |
Wolf, Klara K. E. Rokitta, Sebastian D. Hoppe, Clara J. M. Rost, Björn |
author_sort |
Wolf, Klara K. E. |
title |
Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
title_short |
Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
title_full |
Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
title_fullStr |
Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
title_full_unstemmed |
Pelagic and ice‐associated microalgae under elevated light and pCO 2 : Contrasting physiological strategies in two Arctic diatoms |
title_sort |
pelagic and ice‐associated microalgae under elevated light and pco 2 : contrasting physiological strategies in two arctic diatoms |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/lno.12174 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12174 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12174 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12174 |
genre |
Arctic Ocean Ocean acidification Sea ice |
genre_facet |
Arctic Ocean Ocean acidification Sea ice |
op_source |
Limnology and Oceanography volume 67, issue 9, page 1895-1910 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12174 |
container_title |
Limnology and Oceanography |
container_volume |
67 |
container_issue |
9 |
container_start_page |
1895 |
op_container_end_page |
1910 |
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1810430330207731712 |