Microbial activity during a coastal phytoplankton bloom on the Western Antarctic Peninsula in late summer
Author
dc.contributor.author
Alcamán Arias, María E.
Author
dc.contributor.author
Farías, Laura
Author
dc.contributor.author
Verdugo, Josefa
Author
dc.contributor.author
Alarcón Schumacher, Tomás
Author
dc.contributor.author
Díez, Beatriz
Admission date
dc.date.accessioned
2018-12-26T23:04:53Z
Available date
dc.date.available
2018-12-26T23:04:53Z
Publication date
dc.date.issued
2018-05
Cita de ítem
dc.identifier.citation
FEMS Microbiology Letters, 365, 2018, fny090
es_ES
Identifier
dc.identifier.other
10.1093/femsle/fny090
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/159222
Abstract
dc.description.abstract
Phytoplankton biomass during the austral summer is influenced by freezing and melting cycles as well as oceanographic processes that enable nutrient redistribution in the West Antarctic Peninsula (WAP). Microbial functional capabilities, metagenomic and metatranscriptomic activities as well as inorganic C-13-and N-15-assimilation rates were studied in the surface waters of Chile Bay during two contrasting summer periods in 2014. Concentrations of Chlorophyll a (Chla) varied from 0.3 mg m(-3) in February to a maximum of 2.5 mg m(-3) in March, together with a decrease in nutrients; however, nutrients were never depleted. The microbial community composition remained similar throughout both sampling periods; however, microbial abundance and activity changed with Chla levels. An increased biomass of Bacillariophyta, Haptophyceae and Cryptophyceae was observed along with night-grazing activity of Dinophyceae and ciliates (Alveolates). During high Chla conditions, HCO3- uptake rates during daytime incubations increased 5-fold (>2516 nmol C L-1 d(-1)), and increased photosynthetic transcript numbers that were mainly associated with cryptophytes; meanwhile night time NO3- (>706 nmol N L-1 d(-1)) and NH4+ (41.7 nmol N L-1 d(-1)) uptake rates were 2- and 3-fold higher, respectively, due to activity from Alpha-/Gammaproteobacteria and Bacteroidetes (Flavobacteriia). Due to a projected acceleration in climate change in the WAP, this information is valuable for predicting the composition and functional changes in Antarctic microbial communities.
es_ES
Patrocinador
dc.description.sponsorship
Chilean Antarctic Institute
INACH T_15-10
Programa de Cooperacion Internacional (PCI)-Comision Nacional de Investigacion y Tecnologia (CONICYT)
DPI20140044
Fondo de Financiamiento de Centros de Investigacion en Areas Prioritarias (FONDAP)-CONICYT
15110009
Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT postdoctoral) -CONICYT
3170807