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 View the Math...
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ftnioz:oai:imis.nioz.nl:286029 2023-05-15T13:47:57+02:00 Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer Cheah, W. Soppa, M.A. Wiegmann, S. Ossebaar, S. Laglera, L.M. Strass, V.H. Santos-Echeandía, J. Hoppema, M. Wolf-Gladrow, D. Bracher, A. 2017 http://imis.nioz.nl/imis.php?module=ref&refid=286029 en eng info:eu-repo/semantics/altIdentifier/wos/000401211100007 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.dsr2.2016.05.019 http://imis.nioz.nl/imis.php?module=ref&refid=286029 info:eu-repo/semantics/closedAccess %3Ci%3EDeep-Sea+Res.,+Part+II,+Top.+Stud.+Oceanogr.+138%3C%2Fi%3E%3A+74-85.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr2.2016.05.019%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr2.2016.05.019%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftnioz https://doi.org/10.1016/j.dsr2.2016.05.019 2022-05-01T14:05:56Z 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 View the MathML source(<0.3μmolm−3) conditions, high total chlorophyll-a (TChl-a) concentrations View the MathML source(>0.6mgm−3) can be observed at stations with deep mixed layer View the MathML source(>60m) 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 View the MathML source(<2mmolm−3) 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 View the MathML source(>5mmolm−3) 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 View the MathML source0.6mgm−3 are achievable in the iron-limited APF waters during summer. Article in Journal/Newspaper Antarc* Antarctic NIOZ Repository (Royal Netherlands Institute for Sea Research) Antarctic Austral The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 138 74 85 |
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Open Polar |
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NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
language |
English |
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 View the MathML source(<0.3μmolm−3) conditions, high total chlorophyll-a (TChl-a) concentrations View the MathML source(>0.6mgm−3) can be observed at stations with deep mixed layer View the MathML source(>60m) 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 View the MathML source(<2mmolm−3) 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 View the MathML source(>5mmolm−3) 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 View the MathML source0.6mgm−3 are achievable in the iron-limited APF waters during summer. |
format |
Article in Journal/Newspaper |
author |
Cheah, W. Soppa, M.A. Wiegmann, S. Ossebaar, S. Laglera, L.M. Strass, V.H. Santos-Echeandía, J. Hoppema, M. Wolf-Gladrow, D. Bracher, A. |
spellingShingle |
Cheah, W. Soppa, M.A. Wiegmann, S. Ossebaar, S. Laglera, L.M. Strass, V.H. Santos-Echeandía, J. Hoppema, M. Wolf-Gladrow, D. Bracher, A. 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, W. Soppa, M.A. Wiegmann, S. Ossebaar, S. Laglera, L.M. Strass, V.H. Santos-Echeandía, J. Hoppema, M. Wolf-Gladrow, D. Bracher, A. |
author_sort |
Cheah, W. |
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 |
publishDate |
2017 |
url |
http://imis.nioz.nl/imis.php?module=ref&refid=286029 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
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info:eu-repo/semantics/closedAccess |
op_doi |
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Deep Sea Research Part II: Topical Studies in Oceanography |
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