Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms
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...
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AMER SOC LIMNOLOGY OCEANOGRAPHY
2022
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Online Access: | https://epic.awi.de/id/eprint/56475/ https://epic.awi.de/id/eprint/56475/1/Wolf_et_al_2022.pdf https://hdl.handle.net/10013/epic.69e64d78-ee20-4d8b-a605-580ba1b93298 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:56475 2023-05-15T14:27:39+02:00 Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms Wolf, Klara Rokitta, Sebastian Hoppe, Clara Rost, Bjoern 2022 application/pdf https://epic.awi.de/id/eprint/56475/ https://epic.awi.de/id/eprint/56475/1/Wolf_et_al_2022.pdf https://hdl.handle.net/10013/epic.69e64d78-ee20-4d8b-a605-580ba1b93298 https://hdl.handle.net/ unknown AMER SOC LIMNOLOGY OCEANOGRAPHY https://epic.awi.de/id/eprint/56475/1/Wolf_et_al_2022.pdf https://hdl.handle.net/ Wolf, K. orcid:0000-0003-4638-5316 , Rokitta, S. orcid:0000-0002-7540-9033 , Hoppe, C. orcid:0000-0002-2509-0546 and Rost, B. orcid:0000-0001-5452-5505 (2022) Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms , Limnology and Oceanography . doi:10.1002/lno.12174 <https://doi.org/10.1002/lno.12174> , hdl:10013/epic.69e64d78-ee20-4d8b-a605-580ba1b93298 EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, ISSN: 0024-3590 Article NonPeerReviewed 2022 ftawi https://doi.org/10.1002/lno.12174 2022-07-31T23:12:18Z 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. We therefore investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica towards elevated irradiance and CO2 partial pressures. 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 pCO2 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 Arctic Arctic Ocean Ocean acidification Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Limnology and Oceanography |
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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 |
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. We therefore investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica towards elevated irradiance and CO2 partial pressures. 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 pCO2 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 Rokitta, Sebastian Hoppe, Clara Rost, Bjoern |
spellingShingle |
Wolf, Klara Rokitta, Sebastian Hoppe, Clara Rost, Bjoern Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
author_facet |
Wolf, Klara Rokitta, Sebastian Hoppe, Clara Rost, Bjoern |
author_sort |
Wolf, Klara |
title |
Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
title_short |
Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
title_full |
Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
title_fullStr |
Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
title_full_unstemmed |
Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms |
title_sort |
pelagic and ice-associated microalgae under elevated light and pco2: contrasting physiological strategies in two arctic diatoms |
publisher |
AMER SOC LIMNOLOGY OCEANOGRAPHY |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56475/ https://epic.awi.de/id/eprint/56475/1/Wolf_et_al_2022.pdf https://hdl.handle.net/10013/epic.69e64d78-ee20-4d8b-a605-580ba1b93298 https://hdl.handle.net/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Ocean acidification Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Ocean acidification Sea ice |
op_source |
EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, ISSN: 0024-3590 |
op_relation |
https://epic.awi.de/id/eprint/56475/1/Wolf_et_al_2022.pdf https://hdl.handle.net/ Wolf, K. orcid:0000-0003-4638-5316 , Rokitta, S. orcid:0000-0002-7540-9033 , Hoppe, C. orcid:0000-0002-2509-0546 and Rost, B. orcid:0000-0001-5452-5505 (2022) Pelagic and ice-associated microalgae under elevated light and pCO2: Contrasting physiological strategies in two Arctic diatoms , Limnology and Oceanography . doi:10.1002/lno.12174 <https://doi.org/10.1002/lno.12174> , hdl:10013/epic.69e64d78-ee20-4d8b-a605-580ba1b93298 |
op_doi |
https://doi.org/10.1002/lno.12174 |
container_title |
Limnology and Oceanography |
_version_ |
1766301480320499712 |