Phytoplankton pigment concentrations during POLARSTERN cruise ANT-XXVII/2 ...

• Main Author: Bracher, Astrid
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Event label; Number; Campaign; Sample code/label; Sample, optional label/labor no; Device type; DEPTH, water; DATE/TIME; LATITUDE; LONGITUDE; Chlorophyll a; Chlorophyllide a; Chlorophyll b; Chlorophyll c1+c2; Chlorophyll c3; 19-Butanoyloxyfucoxanthin; 19-Hexanoyloxyfucoxanthin; Alloxanthin; Diadinoxanthin; Diatoxanthin; Fucoxanthin; Neoxanthin; Peridinin; Zeaxanthin; Carotene; Pheophytin a; Pyropheophorbide a; Pyropheophytin a; CTD/Rosette; Water sample; High Performance Liquid Chromatography HPLC; ANT-XXVII/2; Polarstern; Physical Oceanography @ AWI AWI_PhyOce; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Drake Passage
• Online Access: https://dx.doi.org/10.1594/pangaea.848590; https://doi.pangaea.de/10.1594/PANGAEA.848590

Photophysiological processes as well as uptake characteristics of iron and inorganic carbon were studied in inshore phytoplankton assemblages of the Western Antarctic Peninsula (WAP) and offshore assemblages of the Drake Passage. Chlorophyll a concentrations and primary productivity decreased from in- to offshore waters. The inverse relationship between low maximum quantum yields of photochemistry in PSII (Fv/Fm) and large sizes of functional absorption cross sections (sigma PSII) in offshore communities indicated iron-limitation. Congruently, the negative correlation between Fv/Fm values and iron uptake rates across our sampling locations suggest an overall better iron uptake capacity in iron-limited pelagic phytoplankton communities. Highest iron uptake capacities could be related to relative abundances of the haptophyte Phaeocystis antarctica. As chlorophyll a-specific concentrations of humic-like substances were similarly high in offshore and inshore stations, we suggest humic-like substances may play an ...