Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/103129
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dc.contributor.authorPeipoch, Marc-
dc.contributor.authorGacia, Esperança-
dc.contributor.authorPastor, Ada-
dc.contributor.authorRibot, Miquel-
dc.contributor.authorRiera, Joan L.-
dc.contributor.authorSabater, Francesc-
dc.contributor.authorMartí, Eugènia-
dc.date.accessioned2014-10-10T05:28:12Z-
dc.date.available2014-10-10T05:28:12Z-
dc.date.issued2014-
dc.identifier.citationLimnol. Oceanogr. 59(6) : 1973–1986 (2014)es_ES
dc.identifier.issn0024-3590-
dc.identifier.urihttp://hdl.handle.net/10261/103129-
dc.description14 páginas, 5 figuras, 3 tablases_ES
dc.description.abstractWe investigated the intrinsic (i.e., metabolic character of autotrophs) and extrinsic (i.e., nutrients and light availability) controls on the variation in autotrophic nitrogen (N) cycling in stream ecosystems based on 15N isotopic incorporation into five autotrophic components (biofilm, filamentous algae, bryophytes, and submerged and emergent macrophytes) differing in structural complexity and metabolic character. Autotrophs from a stream site with depleted 15N signatures and relatively low concentrations of dissolved inorganic N (DIN) were translocated to three reaches downstream of the same stream with higher 15N–DIN signatures and DIN concentrations and different light availability. After the translocation, autotrophs showed an asymptotical increase in their 15N signatures, achieving isotopic equilibrium with the stream water, from which we calculated N uptake and turnover rates for each autotrophic compartment at the three reaches. Uptake rates were highest when both DIN and light availability were also highest. Differences in DIN uptake rates were greater across reaches than among autotrophs, suggesting that autotrophic DIN uptake at both organism and community level is principally controlled by extrinsic factors (e.g., DIN concentration and light incidence). In contrast, variation in N turnover rates was larger among the different autotrophs than among the study reaches, suggesting a stronger control by intrinsic rather than extrinsic factors.es_ES
dc.description.sponsorshipFinancial support was provided by the Spanish Ministry of Science and Innovation through the projects entitled Nitrogen stable isotopes in fluvial ecosystems, the role of biotic components as indicators of nitrogen sources and processes (ISONEF, CGL2008-05504-C02-02/ BOS) and Understanding Biogeochemical linkages between Riparian and Stream Ecosystems under Mediterranean climate conditions (CGL2011-30590-C02-02) projects. M.P. and A.P. were granted two Ph.D. fellowships (Formacio´n de Personal Investigador) from the Spanish Ministry of Science and Innovation through the ISONEF project. M.R. was supported by a technical training contract also associated with the ISONEF project.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Society of Limnology and Oceanographyes_ES
dc.rightsopenAccesses_ES
dc.titleIntrinsic and extrinsic drivers of autotrophic nitrogen cycling in stream ecosystems: Results from a translocation experimentes_ES
dc.typeartículoes_ES
dc.identifier.doi10.4319/lo.2014.59.6.1973-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.4319/lo.2014.59.6.1973es_ES
dc.relation.csices_ES
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.grantfulltextnone-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
item.fulltextNo Fulltext-
item.languageiso639-1en-
item.openairetypeartículo-
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