Phytoplankton pigment concentrations during POLARSTERN cruise ANT-XXVII/2


Autoria(s): Bracher, Astrid
Cobertura

MEDIAN LATITUDE: -64.735800 * MEDIAN LONGITUDE: -46.819367 * SOUTH-BOUND LATITUDE: -70.522000 * WEST-BOUND LONGITUDE: -74.601000 * NORTH-BOUND LATITUDE: -47.661000 * EAST-BOUND LONGITUDE: 4.256000 * DATE/TIME START: 2010-12-05T13:57:00 * DATE/TIME END: 2011-01-28T10:21:00 * MINIMUM DEPTH, water: 0 m * MAXIMUM DEPTH, water: 80 m

Data(s)

04/08/2015

Resumo

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 important role in iron chemistry in both coastal and pelagic phytoplankton assemblages. Regarding inorganic carbon uptake kinetics, the measured maximum short-term uptake rates (Vmax(CO2)) and apparent half-saturation constants (K1/2(CO2)) did not differ between offshore and inshore phytoplankton. Moreover, Vmax(CO2) and K1/2(CO2) did not exhibit any CO2-dependent trend over the natural pCO2 range from 237 to 507 µatm. K1/2(CO2) strongly varied among the sampled phytoplankton communities, ranging between 3.5 and 35.3 µmol/L CO2. While in many of the sampled phytoplankton communities, the operation of carbon-concentrating mechanisms (CCMs) was indicated by low K1/2(CO2) values relative to ambient CO2 concentrations, some coastal sites exhibited higher values, suggesting down-regulated CCMs. Overall, our results demonstrate a complex interplay between photophysiological processes, iron and carbon uptake of phytoplankton communities of the WAP and the Drake Passage.

Formato

text/tab-separated-values, 690 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.848590

doi:10.1594/PANGAEA.848590

Idioma(s)

en

Publicador

PANGAEA

Relação

doi:10.1594/PANGAEA.848661

Trimborn, Scarlett; Hoppe, Clara Jule Marie; Taylor, Bettina B; Bracher, Astrid; Hassler, Christel S (2015): Physiological characteristics of open ocean and coastal phytoplankton communities of Western Antarctic Peninsula and Drake Passage waters. Deep Sea Research Part I: Oceanographic Research Papers, 98, 115-124, doi:10.1016/j.dsr.2014.12.010

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven

Palavras-Chave #19-Butanoyloxyfucoxanthin; 19-Hexanoyloxyfucoxanthin; Alloxanthin; ANT-XXVII/2; AWI_PhyOce; Campaign; Carotene; Chlorophyll a; Chlorophyll b; Chlorophyll c1+c2; Chlorophyll c3; Chlorophyllide a; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Device type; Diadinoxanthin; Diatoxanthin; Drake Passage; Event label; Fucoxanthin; High Performance Liquid Chromatography (HPLC); LATITUDE; LONGITUDE; Neoxanthin; Number; Peridinin; Pheophytin a; Physical Oceanography @ AWI; Polarstern; PS77; PS77/034-2; PS77/044-1; PS77/048-1; PS77/051-1; PS77/056-1; PS77/067-1; PS77/081-1; PS77/096-1; PS77/100-1; PS77/125-2; PS77/133-2; PS77/134-2; PS77/160-2; PS77/167-2; PS77/172-2; PS77/175-2; PS77/177-2; PS77/178-2; PS77/182-2; PS77/184-4; PS77/188-2; PS77/191-2; PS77/194-2; PS77/198-2; PS77/bucket; Pyropheophorbide a; Pyropheophytin a; Sample, optional label/labor no; Sample code/label; Scotia Sea, southwest Atlantic; South Atlantic Ocean; South Pacific Ocean; Water sample; Weddell Sea; WS; Zeaxanthin
Tipo

Dataset