English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/98762
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Temporal Variability of Nitrogen Stable Isotopes in Primary Uptake Compartments in Four Streams Differing in Human Impacts

AutorPastor, Ada; Riera, Joan L.; Peipoch, Marc ; Cañas, Lídia; Ribot, Miquel ; Gacia, Esperança ; Martí, Eugènia ; Sabater, Francesc
Fecha de publicación2014
EditorAmerican Chemical Society
CitaciónEnviron. Sci. Technol. 48 : 6612-6619 (2014)
ResumenUnderstanding the variability of the natural abundance in nitrogen stable isotopes (expressed as δ15N) of primary uptake compartments (PUCs; e.g., epilithon or macrophytes) is important due to the multiple applications of stable isotopes in freshwater research and can give insights into environmental and anthropogenic factors controlling N dynamics in streams. While previous research has shown how δ15N of PUCs varies with δ15N of dissolved inorganic N (DIN) among streams, less is known about how δ15N of PUCs varies over time. Here, we examined monthly variation of δ15N of PUCs and of DIN species (nitrate and ammonium) over a year, and compared it among streams with contrasting human impacts and PUC types. Our results showed no evidence of isotopic seasonal patterns. Temporal variability in δ15N-PUCs increased with human impact, being the highest in the urban stream, probably influenced by the high variability of δ15N-DIN. Among compartments, in-stream PUCs characterized by fast turnover rates, such as filamentous algae, showed the highest temporal variability in δ15N values (from −3.6 to 23.2 ‰). Our study elucidates some of the environmental and biological controls of temporal variability of δ15N in streams, which should be taken into account when using stable isotopes as an ecological tool.
Descripción8 páginas, 3 figuras, 1 tabla.
Versión del editorhttp://dx.doi.org/10.1021/es405493k
URIhttp://hdl.handle.net/10261/98762
DOI10.1021/es405493k
ISSN0013-936X
E-ISSN1520-5851
Aparece en las colecciones: (CEAB) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
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.