Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes
Long-term phytoplankton monitoring studies, specifically in the coastal areas of the Western Antarctic Peninsula, have shown the recurring succession of diatoms and cryptophytes wherein diatoms usually dominate during the early summer when Fe concentrations are high, which are then replaced by crypt...
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ftawi:oai:epic.awi.de:49906 2024-09-15T17:47:09+00:00 Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes Camoying, Marianne Trimborn, Scarlett 2019-06-17 https://epic.awi.de/id/eprint/49906/ https://hdl.handle.net/10013/epic.50288a42-1b36-48ea-8176-d81f795d07c1 unknown Camoying, M. orcid:0000-0002-4180-7850 and Trimborn, S. orcid:0000-0003-1434-9927 (2019) Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes , 2019 IMBeR Open Science Conference, Brest, France, 17 June 2019 - 21 June 2019 . hdl:10013/epic.50288a42-1b36-48ea-8176-d81f795d07c1 EPIC32019 IMBeR Open Science Conference, Brest, France, 2019-06-17-2019-06-21 Conference notRev 2019 ftawi 2024-06-24T04:22:11Z Long-term phytoplankton monitoring studies, specifically in the coastal areas of the Western Antarctic Peninsula, have shown the recurring succession of diatoms and cryptophytes wherein diatoms usually dominate during the early summer when Fe concentrations are high, which are then replaced by cryptophytes in late summer at lower Fe availability. Laboratory incubation experiments were conducted to examine how increasing pCO2 levels (400, 1000 and in the case of the diatom, 1400 µatm) and different iron availability (0.2 and 0.9 nM) will impact the two Southern Ocean phytoplankton key species Pseudo-nitzschia subcurvata and Geminigera cryophila. Results of this study exhibited a different pattern between the two species as the cryptophyte manifested generally lowered growth rates and photochemical efficiencies compared to the diatom Pseudo-nitzschia subcurvata for all pCO2-Fe treatment combinations. This suggests that G. cryophila had higher Fe requirement than the latter. The diatom was particularly sensitive to ocean acidification under Fe-deplete condition as growth strongly declined with increasing pCO2, but no OA-effect on growth was observed in the Fe-enriched treatments. In comparison, growth of the cryptophyte was stimulated by high pCO2 under high Fe availability, but remained unaffected under low Fe concentration. Hence, the two species showed varying responses wherein G. cryophila appears to be less vulnerable to ocean acidification yet greatly affected by Fe-limitation while the susceptibility of P. subcurvata to OA is enhanced under Fe-deplete conditions. Conference Object Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Long-term phytoplankton monitoring studies, specifically in the coastal areas of the Western Antarctic Peninsula, have shown the recurring succession of diatoms and cryptophytes wherein diatoms usually dominate during the early summer when Fe concentrations are high, which are then replaced by cryptophytes in late summer at lower Fe availability. Laboratory incubation experiments were conducted to examine how increasing pCO2 levels (400, 1000 and in the case of the diatom, 1400 µatm) and different iron availability (0.2 and 0.9 nM) will impact the two Southern Ocean phytoplankton key species Pseudo-nitzschia subcurvata and Geminigera cryophila. Results of this study exhibited a different pattern between the two species as the cryptophyte manifested generally lowered growth rates and photochemical efficiencies compared to the diatom Pseudo-nitzschia subcurvata for all pCO2-Fe treatment combinations. This suggests that G. cryophila had higher Fe requirement than the latter. The diatom was particularly sensitive to ocean acidification under Fe-deplete condition as growth strongly declined with increasing pCO2, but no OA-effect on growth was observed in the Fe-enriched treatments. In comparison, growth of the cryptophyte was stimulated by high pCO2 under high Fe availability, but remained unaffected under low Fe concentration. Hence, the two species showed varying responses wherein G. cryophila appears to be less vulnerable to ocean acidification yet greatly affected by Fe-limitation while the susceptibility of P. subcurvata to OA is enhanced under Fe-deplete conditions. |
format |
Conference Object |
author |
Camoying, Marianne Trimborn, Scarlett |
spellingShingle |
Camoying, Marianne Trimborn, Scarlett Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
author_facet |
Camoying, Marianne Trimborn, Scarlett |
author_sort |
Camoying, Marianne |
title |
Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
title_short |
Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
title_full |
Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
title_fullStr |
Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
title_full_unstemmed |
Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes |
title_sort |
understanding the interactive effects of ocean acidification and the availability of iron on the two southern ocean key phytoplankton groups – diatoms and cryptophytes |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49906/ https://hdl.handle.net/10013/epic.50288a42-1b36-48ea-8176-d81f795d07c1 |
genre |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ocean acidification Southern Ocean |
op_source |
EPIC32019 IMBeR Open Science Conference, Brest, France, 2019-06-17-2019-06-21 |
op_relation |
Camoying, M. orcid:0000-0002-4180-7850 and Trimborn, S. orcid:0000-0003-1434-9927 (2019) Understanding the interactive effects of ocean acidification and the availability of iron on the two Southern Ocean key phytoplankton groups – diatoms and cryptophytes , 2019 IMBeR Open Science Conference, Brest, France, 17 June 2019 - 21 June 2019 . hdl:10013/epic.50288a42-1b36-48ea-8176-d81f795d07c1 |
_version_ |
1810495862045933568 |