Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer.
Phytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44 °S to 53 °S, centred at 10 °E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited conditions...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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2017
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Online Access: | https://epic.awi.de/id/eprint/41899/ https://epic.awi.de/id/eprint/41899/1/Cheah_etal_DSRII_2016.pdf https://hdl.handle.net/10013/epic.48727 https://hdl.handle.net/10013/epic.48727.d001 |
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ftawi:oai:epic.awi.de:41899 2024-09-15T17:45:08+00:00 Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. Cheah, Wee Soppa, Mariana Wiegmann, Sonja Ossebaar, S. Laglera, Luis M. Strass, Volker Santos-Echeandia, Juan Hoppema, Mario Wolf-Gladrow, Dieter Bracher, Astrid 2017-04-14 application/pdf https://epic.awi.de/id/eprint/41899/ https://epic.awi.de/id/eprint/41899/1/Cheah_etal_DSRII_2016.pdf https://hdl.handle.net/10013/epic.48727 https://hdl.handle.net/10013/epic.48727.d001 unknown PERGAMON-ELSEVIER SCIENCE LTD https://epic.awi.de/id/eprint/41899/1/Cheah_etal_DSRII_2016.pdf https://hdl.handle.net/10013/epic.48727.d001 Cheah, W. , Soppa, M. , Wiegmann, S. , Ossebaar, S. , Laglera, L. M. , Strass, V. orcid:0000-0002-7539-1400 , Santos-Echeandia, J. , Hoppema, M. orcid:0000-0002-2326-619X , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Bracher, A. orcid:0000-0003-3025-5517 (2017) Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. , Deep-Sea Research Part II-Topical Studies in Oceanography, 138 , pp. 74-85 . doi:10.1016/j.dsr2.2016.05.019 <https://doi.org/10.1016/j.dsr2.2016.05.019> , hdl:10013/epic.48727 EPIC3Deep-Sea Research Part II-Topical Studies in Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 138, pp. 74-85, ISSN: 0967-0645 Article isiRev 2017 ftawi https://doi.org/10.1016/j.dsr2.2016.05.019 2024-06-24T04:15:36Z Phytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44 °S to 53 °S, centred at 10 °E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited conditions, high total chlorophyll-a (TChl-a) concentrations can be observed at stations with deep mixed layer across the APF. In contrast, light was excessive at stations with shallower mixed layer and phytoplankton were producing higher amounts of photoprotective pigments, diadinoxanthin (DD) and diatoxanthin (DT), at the expense of TChl-a, resulting in higher ratios of (DD+DT)/TChl-a. North of the APF, significantly lower silicic acid (Si(OH)4) concentrations lead to the domination of nanophytoplankton consisting mostly of haptophytes, which produced higher ratios of (DD+DT)/TChl-a under relatively low irradiance conditions. The Si(OH)4 replete region south of the APF, on the contrary, was dominated by microphytoplankton (diatoms and dinoflagellates) with lower ratios of (DD+DT)/TChl-a, despite having been exposed to higher levels of irradiance. The significant correlation between nanophytoplankton and (DD+DT)/TChl-a indicates that differences in taxon-specific response to light are also influencing TChl-a concentration in the APF during summer. Our results reveal that provided mixing is deep and Si(OH)4 is replete, TChl-a concentrations higher than are achievable in the iron-limited APF waters during summer. Article in Journal/Newspaper Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Deep Sea Research Part II: Topical Studies in Oceanography 138 74 85 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Phytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44 °S to 53 °S, centred at 10 °E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited conditions, high total chlorophyll-a (TChl-a) concentrations can be observed at stations with deep mixed layer across the APF. In contrast, light was excessive at stations with shallower mixed layer and phytoplankton were producing higher amounts of photoprotective pigments, diadinoxanthin (DD) and diatoxanthin (DT), at the expense of TChl-a, resulting in higher ratios of (DD+DT)/TChl-a. North of the APF, significantly lower silicic acid (Si(OH)4) concentrations lead to the domination of nanophytoplankton consisting mostly of haptophytes, which produced higher ratios of (DD+DT)/TChl-a under relatively low irradiance conditions. The Si(OH)4 replete region south of the APF, on the contrary, was dominated by microphytoplankton (diatoms and dinoflagellates) with lower ratios of (DD+DT)/TChl-a, despite having been exposed to higher levels of irradiance. The significant correlation between nanophytoplankton and (DD+DT)/TChl-a indicates that differences in taxon-specific response to light are also influencing TChl-a concentration in the APF during summer. Our results reveal that provided mixing is deep and Si(OH)4 is replete, TChl-a concentrations higher than are achievable in the iron-limited APF waters during summer. |
format |
Article in Journal/Newspaper |
author |
Cheah, Wee Soppa, Mariana Wiegmann, Sonja Ossebaar, S. Laglera, Luis M. Strass, Volker Santos-Echeandia, Juan Hoppema, Mario Wolf-Gladrow, Dieter Bracher, Astrid |
spellingShingle |
Cheah, Wee Soppa, Mariana Wiegmann, Sonja Ossebaar, S. Laglera, Luis M. Strass, Volker Santos-Echeandia, Juan Hoppema, Mario Wolf-Gladrow, Dieter Bracher, Astrid Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
author_facet |
Cheah, Wee Soppa, Mariana Wiegmann, Sonja Ossebaar, S. Laglera, Luis M. Strass, Volker Santos-Echeandia, Juan Hoppema, Mario Wolf-Gladrow, Dieter Bracher, Astrid |
author_sort |
Cheah, Wee |
title |
Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
title_short |
Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
title_full |
Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
title_fullStr |
Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
title_full_unstemmed |
Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. |
title_sort |
importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited antarctic polar front region in summer. |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/41899/ https://epic.awi.de/id/eprint/41899/1/Cheah_etal_DSRII_2016.pdf https://hdl.handle.net/10013/epic.48727 https://hdl.handle.net/10013/epic.48727.d001 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3Deep-Sea Research Part II-Topical Studies in Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 138, pp. 74-85, ISSN: 0967-0645 |
op_relation |
https://epic.awi.de/id/eprint/41899/1/Cheah_etal_DSRII_2016.pdf https://hdl.handle.net/10013/epic.48727.d001 Cheah, W. , Soppa, M. , Wiegmann, S. , Ossebaar, S. , Laglera, L. M. , Strass, V. orcid:0000-0002-7539-1400 , Santos-Echeandia, J. , Hoppema, M. orcid:0000-0002-2326-619X , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Bracher, A. orcid:0000-0003-3025-5517 (2017) Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer. , Deep-Sea Research Part II-Topical Studies in Oceanography, 138 , pp. 74-85 . doi:10.1016/j.dsr2.2016.05.019 <https://doi.org/10.1016/j.dsr2.2016.05.019> , hdl:10013/epic.48727 |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.05.019 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
138 |
container_start_page |
74 |
op_container_end_page |
85 |
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1810492853259862016 |