English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/15729
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Bacterial activity and diffusive nutrient supply in the oligotrophic Central Atlantic Ocean

AutorGasol, Josep M. ; Vázquez-Domínguez, Evaristo ; Vaqué, Dolors ; Agustí, Susana ; Duarte, Carlos M.
Palabras claveBacterial activity
Bacterial production
Central Atlantic
Nutrient supply
Primary production
Water column stability
Mediterranean mesocosms
Fecha de publicación9-jul-2009
EditorInter Research
CitaciónAquatic Microbial Ecology 56(1): 1-12 (2009)
ResumenGrowing evidence of inorganic nutrient limitation on oceanic bacteria suggests a global dependence of bacterial activity and production on rates of nutrient supply. The present study examined whether surface bacterial abundance is significantly related to water column stability, and whether bacterial activity and growth rate are related to the rate of diffusive supply of inorganic nutrients to the mixed layer in the Central Atlantic during 2 meridional cruises. The 2 cruises were run under very different oceanic conditions, with relatively low values of bacterial activity in spring 1995 and relatively higher values in fall 1995. We obtained depth-resolved data in the second cruise and found that the integrated value of bacterial production was also related to the rate of nutrient supply, while integrated particulate primary production and chlorophyll concentration were not. There was also no relationship between particulate primary production and bacterial production. The relationship between nutrient supply and integrated bacterial production was tested with data from a mesocosm experiment showing a good fit to the pattern obtained in the Atlantic. Average bacterial production was ~21% of primary production in the Central Atlantic, with values ranging between 5 and 100%, and higher values in the tropical areas. The demonstration of a direct relationship between nutrient supply and bacterial activity helps to explain a relatively large bacterial biomass as compared to phytoplankton biomass, a low bacterial growth efficiency, and a high bacterial carbon demand relative to contemporaneous primary production often measured in the open ocean, as well as the accumulation of dissolved organic carbon (DOC) observed in nutrient-limited oligotrophic seas.
Descripción12 pages, 4 figures, 2 tables.-- Full-text version available Open Access at: http://www.icm.csic.es/bio/projects/icmicrobis/pdf/Gasola056p001.pdf
Versión del editorhttp://dx.doi.org/10.3354/ame01310
URIhttp://hdl.handle.net/10261/15729
DOI10.3354/ame01310
ISSN0948-3055 (Print)
1616-1564 (Online)
Aparece en las colecciones: (ICM) Artículos
(IMEDEA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
a056p001.pdf364,76 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.