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Title: Microbial functioning and community structure variability in the mesopelagic and epipelagic waters of the subtropical northeast Atlantic Ocean
Authors: Baltar, Federico
Aristegui, Javier 
Gasol, Josep M.
Herndl, Gerhard J.
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Nw Mediterranean Sea
Dark Ocean, et al
Issue Date: 2012
Publisher: 0099-2240
Project: Remolinos Oceanicos y de Posición Atmosferica (Roda): Dinámica y Monitorización de Remolinos Oceanicos en la Corriente de Canarias 
Intercambio Plataforma-Oceano en El Ecosistema Marino de Las Islas Canarias-Peninsula Iberica (Caibex):Afloramiento de Cabo Guir 
Journal: Applied and Environmental Microbiology 
Abstract: We analyzed the regional distribution of bulk heterotrophic prokaryotic activity (leucine incorporation) and selected single-cell parameters (cell viability and nucleic acid content) as parameters for microbial functioning, as well as bacterial and archaeal community structure in the epipelagic (0 to 200 m) and mesopelagic (200 to 1,000 m) subtropical Northeast Atlantic Ocean. We selectively sampled three contrasting regions covering a wide range of surface productivity and oceanographic properties within the same basin: (i) the eddy field south of the Canary Islands, (ii) the open-ocean NE Atlantic Subtropical Gyre, and (iii) the upwelling filament off Cape Blanc. In the epipelagic waters, a high regional variation in hydrographic parameters and bacterial community structure was detected, accompanied, however, by a low variability in microbial functioning. In contrast, mesopelagic microbial functioning was highly variable between the studied regions despite the homogeneous abiotic conditions found therein. More microbial functioning parameters indicated differences among the three regions within the mesopelagic (i.e., viability of cells, nucleic acid content, cell-specific heterotrophic activity, nanoflagellate abundance, prokaryote-to-nanoflagellate abundance ratio) than within the epipelagic (i.e., bulk activity, nucleic acid content, and nanoflagellate abundance) waters. Our results show that the mesopelagic realm in the Northeast Atlantic is, in terms of microbial activity, more heterogeneous than its epipelagic counterpart, probably linked to mesoscale hydrographical variations.
ISSN: 0099-2240
DOI: 10.1128/AEM.07962-11
Source: Applied And Environmental Microbiology [ISSN 0099-2240], v. 78 (9), p. 3309-3316
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