In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification
Previous field studies in the Southern Ocean (SO) indicated an increased occurrence and dominance of cryptophytes over diatoms due to climate change. To gain a better mechanistic understanding of how the two ecologically important SO phytoplankton groups cope with ocean acidification (OA) and iron (...
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ftawi:oai:epic.awi.de:55762 2024-06-02T07:57:10+00:00 In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification Camoying, Marianne G. Thoms, Silke Geuer, Jana K. Koch, Boris P. Bischof, Kai Trimborn, Scarlett 2022 https://epic.awi.de/id/eprint/55762/ https://hdl.handle.net/10013/epic.1b864803-f045-41fa-aa1c-9bd526aa5c6f unknown Camoying, M. G. orcid:0000-0002-4180-7850 , Thoms, S. , Geuer, J. K. orcid:0000-0002-4497-1920 , Koch, B. P. orcid:0000-0002-8453-731X , Bischof, K. orcid:0000-0002-4497-1920 and Trimborn, S. orcid:0000-0003-1434-9927 (2022) In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification , Ocean Sciences Meeting 2022, 24 February 2022 - 4 March 2022 . hdl:10013/epic.1b864803-f045-41fa-aa1c-9bd526aa5c6f EPIC3Ocean Sciences Meeting 2022, 2022-02-24-2022-03-04Physiologia Plantarum, 174(1), ISSN: 0031-9317 Conference notRev 2022 ftawi 2024-05-07T23:37:52Z Previous field studies in the Southern Ocean (SO) indicated an increased occurrence and dominance of cryptophytes over diatoms due to climate change. To gain a better mechanistic understanding of how the two ecologically important SO phytoplankton groups cope with ocean acidification (OA) and iron (Fe) availability, we chose two common representatives of Antarctic waters, the cryptophyte Geminigera cryophila and the diatom Pseudo-nitzschia subcurvata. Both species were grown at 2°C under different pCO2 (400 vs. 900 μatm) and Fe (0.6 vs. 1.2 nM) conditions. For P. subcurvata, an additional high pCO2 level was applied (1400 μatm). At ambient pCO2 under low Fe supply, growth of G. cryophila almost stopped while it remained unaffected in P. subcurvata. Under high Fe conditions, OA was not beneficial for P. subcurvata, but stimulated growth and carbon production of G. cryophila. Under low Fe supply, P. subcurvata coped much better with OA than the cryptophyte, but invested more energy into photoacclimation. Our study reveals that Fe limitation was detrimental for the growth of G. cryophila and suppressed the positive OA effect. The diatom was efficient in coping with low Fe, but was stressed by OA while both factors together strongly impacted its growth. The distinct physiological response of both species to OA and Fe limitation explains their occurrence in the field. Based on our results, Fe availability is an important modulator of OA effects on SO phytoplankton, with different implications on the occurrence of cryptophytes and diatoms in the future. Conference Object Antarc* Antarctic Ocean acidification Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean Physiologia Plantarum 174 1 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
Previous field studies in the Southern Ocean (SO) indicated an increased occurrence and dominance of cryptophytes over diatoms due to climate change. To gain a better mechanistic understanding of how the two ecologically important SO phytoplankton groups cope with ocean acidification (OA) and iron (Fe) availability, we chose two common representatives of Antarctic waters, the cryptophyte Geminigera cryophila and the diatom Pseudo-nitzschia subcurvata. Both species were grown at 2°C under different pCO2 (400 vs. 900 μatm) and Fe (0.6 vs. 1.2 nM) conditions. For P. subcurvata, an additional high pCO2 level was applied (1400 μatm). At ambient pCO2 under low Fe supply, growth of G. cryophila almost stopped while it remained unaffected in P. subcurvata. Under high Fe conditions, OA was not beneficial for P. subcurvata, but stimulated growth and carbon production of G. cryophila. Under low Fe supply, P. subcurvata coped much better with OA than the cryptophyte, but invested more energy into photoacclimation. Our study reveals that Fe limitation was detrimental for the growth of G. cryophila and suppressed the positive OA effect. The diatom was efficient in coping with low Fe, but was stressed by OA while both factors together strongly impacted its growth. The distinct physiological response of both species to OA and Fe limitation explains their occurrence in the field. Based on our results, Fe availability is an important modulator of OA effects on SO phytoplankton, with different implications on the occurrence of cryptophytes and diatoms in the future. |
format |
Conference Object |
author |
Camoying, Marianne G. Thoms, Silke Geuer, Jana K. Koch, Boris P. Bischof, Kai Trimborn, Scarlett |
spellingShingle |
Camoying, Marianne G. Thoms, Silke Geuer, Jana K. Koch, Boris P. Bischof, Kai Trimborn, Scarlett In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
author_facet |
Camoying, Marianne G. Thoms, Silke Geuer, Jana K. Koch, Boris P. Bischof, Kai Trimborn, Scarlett |
author_sort |
Camoying, Marianne G. |
title |
In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
title_short |
In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
title_full |
In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
title_fullStr |
In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
title_full_unstemmed |
In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
title_sort |
in contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/55762/ https://hdl.handle.net/10013/epic.1b864803-f045-41fa-aa1c-9bd526aa5c6f |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Ocean acidification Southern Ocean |
op_source |
EPIC3Ocean Sciences Meeting 2022, 2022-02-24-2022-03-04Physiologia Plantarum, 174(1), ISSN: 0031-9317 |
op_relation |
Camoying, M. G. orcid:0000-0002-4180-7850 , Thoms, S. , Geuer, J. K. orcid:0000-0002-4497-1920 , Koch, B. P. orcid:0000-0002-8453-731X , Bischof, K. orcid:0000-0002-4497-1920 and Trimborn, S. orcid:0000-0003-1434-9927 (2022) In contrast to diatoms, cryptophytes are susceptible to iron limitation, but not to ocean acidification , Ocean Sciences Meeting 2022, 24 February 2022 - 4 March 2022 . hdl:10013/epic.1b864803-f045-41fa-aa1c-9bd526aa5c6f |
container_title |
Physiologia Plantarum |
container_volume |
174 |
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1 |
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1800739399243137024 |