Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/46907
Título: Dominance of unicellular cyanobacteria in the diazotrophic community in the Atlantic Ocean
Autores/as: Agawin, Nona S.R.
Benavides Gorostegui,Mar 
Busquets, Antonio
Ferriol, Pere 
Stal, Lucas J.
Aristegui, Javier 
Clasificación UNESCO: 251001 Oceanografía biológica
Palabras clave: Cyanobacteria
Atlantic Ocean
Fecha de publicación: 2014
Editor/a: 0024-3590
Proyectos: Intercambio Plataforma-Oceano en El Ecosistema Marino de Las Islas Canarias-Peninsula Iberica (Caibex):Afloramiento de Cabo Guir 
Publicación seriada: Limnology and Oceanography 
Resumen: The horizontal and vertical distribution of representatives of diazotrophic unicellular cyanobacteria wasinvestigated in the subtropical northeast Atlantic Ocean (28.87 to 42.00uN; 9.01 to 20.02uW). Samples fromstations encompassing different water conditions (from oceanic oligotrophic waters to upwelling areas and atemperature range of 13.1uC to 24.2uC) were size fractionated and analyzed fornifHby a nested polymerase chainreaction (PCR) and by tyramide signal amplification–fluorescence in situ hybridization (TSA-FISH) using probeNitro821. In samples from the surface, mixed-layer depth, and deep chlorophyll maximum waters, most (.50%)of thenifHrecovered was from the 0.2–3mm fraction and was consistent with TSA-FISH counts. The,3mmNitro821-positive cells were more abundant than the larger cells, and the proportion of single cells was larger thanthat associated with particulate matter or with larger cells. Phylogenetic analysis of representative samplesrevealed that most of the sequences belong to diazotrophic unicellular cyanobacteria Group A (UCYN-A orCandidatusAtelocyanobacterium thalassa). N2fixation in the 0.2–3mm fraction, putatively representing theactivity of UCYN-A, contributed more than 50%of the total N2fixation. There was a positive relationship of thisputative UCYN-A abundance and activity with temperature, and a negative relationship with dissolved O2. Thedominance of these putative UCYN-A organisms in nitrate-rich upwelling filament regions suggests that theactivity of this group of organisms may not be strongly controlled by the availability of fixed N.
URI: http://hdl.handle.net/10553/46907
ISSN: 0024-3590
DOI: 10.4319/lo.2014.59.2.0623
Fuente: Limnology And Oceanography [ISSN 0024-3590], v. 59 (2), p. 623-637
Colección:Artículos
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