English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/48442
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Assessing the microbial bioavailability and degradation rate constants of dissolved organic matter by fluorescence spectroscopy in the coastal upwelling system of the Ría de Vigo

AutorLonborg, Ch. ; Álvarez-Salgado, Xosé Antón ; Davidson, Keith; Martínez-García, Sandra; Teira, Eva
Palabras claveDOc
Bioavailable
Refractory
Degradation rate constant
Fluorescence spectroscopy
Fecha de publicación2010
EditorElsevier
CitaciónMarine Chemistry 119(1-4): 121-129 (2010)
ResumenThe time course of colored dissolvedorganicmatter (CDOM) absorption and fluorescence were monitored during 50 to 70 days of laboratory incubations with water collected in the coastal upwelling system of the Ría de Vigo (NW Iberian Peninsula) under contrasting hydrographic conditions. CDOM fluorescence at peak-T (Ex/Em, 280/350 nm), characteristic of protein-like materials, decayed at a 1st order degradation rateconstant (kT) of 0.28 ± 0.13 day− 1 (average ± SD). kT covaried (R2 = 0.86, p < 0.0002) with the degradation rate of the bulk DOC (kDOC), but the protein-like materials degraded 72 ± 23% faster than DOC. Therefore, this study confirms that the CDOM fluorescence at peak-T can be used as a proxy to a DOM fraction significantly more labile than the bulk bioavailable DOC. In parallel with the decay of DOC and protein-like fluorescence, an increase in CDOM fluorescence at peak-M (Ex/Em, 320/410 nm) during the course of the incubations verified the production of marine humic-like substances as a by-product of the microbial metabolism. CDOM fluorescence at peak-M built-up at a production rate (kM) of 0.06 ± 0.01 day− 1 (average ± SD) in the Ría de Vigo. Furthermore, the slope of the linear regression between kDOC and kM (R2 = 0.64, p < 0.001) revealed that the formation of marine humic-like substances occurred at about one fifth of the rate of net DOC consumption
Descripción3 tablas, 3 figuras
Versión del editorhttp://dx.doi.org/10.1016/j.marchem.2010.02.001
URIhttp://hdl.handle.net/10261/48442
DOI10.1016/j.marchem.2010.02.001
ISSN0304-4203
Aparece en las colecciones: (IIM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Lonborg et al_MARCHEM_2010_Digital CSIC.pdf250,89 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.