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Título

Contrasts among macrophyte riparian species in their use of stream water nitrate and ammonium: insights from 15N natural abundance

Autor Peipoch, Marc ; Gacia, Esperança ; Blesa, Alba; Ribot, Miquel ; Riera, Joan L.; Martí, Eugènia
Palabras clave Macrophyte
Streams
Stable isotopes
Nitrogen
Stream restoration
Fecha de publicación abr-2014
EditorSpringer
Citación Aquatic Sciences 76 : 203-215 (2014)
ResumenWe examined the relevance of dissolved inorganic nitrogen (DIN) forms (nitrate and ammonium) in stream water as N sources for different macrophyte species. To do this, we investigated the variability and relationships between 15N natural abundance of DIN forms and of four different macrophyte species in five different streams influenced by inputs from wastewater treatment plants and over time within one of these streams. Results showed that 15N signatures were similar in species of submersed and amphibious macrophytes and in stream water DIN, whereas 15N signatures of the riparian species were not. 15N signatures of macrophytes were generally closer to 15N signatures of nitrate, regardless of the species considered. Our results showed significant relationships between 15N signatures of DIN and those of submersed Callitriche stagnalis and amphibious Veronica beccabunga and Apium nodiflorum, suggesting stream water DIN as a relevant N source for these two functional groups. Moreover, results from a mixing model suggested that stream water DIN taken up by the submersed and amphibious species was mostly in the form of nitrate. Together, these results suggest different contribution to in-stream N uptake among the spatially-segregated species of macrophytes. While submersed and amphibious species can contribute to in-stream N uptake by assimilation of DIN, macrophyte species located at stream channel edges do not seem to rely on stream water DIN as an N source. Ultimately, these results add a functional dimension to the current use of macrophytes for the restoration of stream channel morphology, indicating that they can also contribute to reduce excess DIN in streams.
Descripción 13 páginas, 4 figuras, 4 tables.
Versión del editorhttp://dx.doi.org/10.1007/s00027-013-0330-7
URI http://hdl.handle.net/10261/94604
DOI10.1007/s00027-013-0330-7
ISSN1015-1621
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