Phytoplankton composition derived from CHEMTAX along 10°E during POLARSTERN cruise ANT-XXVIII/3, Jan-March 2012 ...

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 (< 0.3 µmo...

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Bibliographic Details
Main Authors: Cheah, Wee, Soppa, Mariana A, Wiegmann, Sonja, Ossebaar, Sharyn, Laglera, Luis Miguel, Strass, Volker H, Santos-Echeandía, Juan, Hoppema, Mario, Wolf-Gladrow, Dieter A, Bracher, Astrid
Format: Dataset
Language:English
Published: PANGAEA 2016
Subjects:
Event label
Date/Time of event
Latitude of event
Longitude of event
Elevation of event
DEPTH, water
Cyanobacteria
Chlorophytes
Prasinophytes
Cryptophytes
Diatoms
Dinoflagellates
Haptophytes
CTD/Rosette
In situ pump
CHEMTAX Lewitus et al., 2005
ANT-XXVIII/3
Polarstern
Antarc*
Antarctic
Online Access:https://dx.doi.org/10.1594/pangaea.866372
https://doi.pangaea.de/10.1594/PANGAEA.866372
Description
Summary: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 (< 0.3 µmol/m**3) conditions, high total chlorophyll-a (TChl-a) concentrations (> 0.6 mg/m**3) can be observed at stations with deep mixed layer (> 60 m) 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 (< 2 mmol/m**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 (> 5 ... : Supplement to: Cheah, Wee; Soppa, Mariana A; Wiegmann, Sonja; Ossebaar, Sharyn; Laglera, Luis Miguel; Strass, Volker H; Santos-Echeandía, Juan; Hoppema, Mario; Wolf-Gladrow, Dieter A; Bracher, Astrid (2016): 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, 12 pp ...

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