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dc.contributor.authorVon Schiller, D.-
dc.contributor.authorMartí, Eugènia-
dc.contributor.authorRiera, Joan L.-
dc.contributor.authorRibot, Miquel-
dc.contributor.authorMarks, J. C.-
dc.identifier.citationFreshwater Biology 53(12) : 2600-2612 (2008)es_ES
dc.description13 Páginas ; 3 Figuras ; 3 Tablases_ES
dc.description.abstract1. Due to the hierarchical organization of stream networks, land use changes occurring at larger spatial scales (i.e. the catchment) can affect physical, chemical and biological characteristics at lower spatial scales, ultimately altering stream structure and function. Anthropogenic effects on streams have primarily been documented using structural metrics such as water chemistry, channel alteration and algal biomass. Functional parameters, including metrics of nutrient retention and metabolism, are now being widely used as indicators of stream condition. 2. Within this hierarchical context, we used a multivariate approach to examine how structural and functional (i.e. nutrient retention and metabolism) attributes of streams are related to catchment variables, including land use. The study was done in 13 streams located within a single Mediterranean catchment, but draining sub-catchments with contrasting land use. 3. At the catchment scale, results showed two contrasting land use gradients: (i) from forested- to urban-dominated catchments and (ii) from low to moderate agricultural-dominated catchments. Variation in structural and functional parameters was strongly related to these land use gradients. Specifically, NH4+ demand (measured as the uptake velocity, Vf) decreased along the gradient from forested- to urban-dominated catchments primarily in response to increases in stream nutrient concentrations [NH4+, dissolved organic nitrogen (DON) and carbon (DOC)]. Both primary production and respiration increased along the gradient of agricultural development in response to increases in algal biomass (chlorophyll a). Soluble reactive phosphorus demand was not related to any of the land use gradients. 4. Our results illustrate the connections among factors operating at different spatial scales (i.e. from catchments to streams) and their distinct influence on stream ecosystem function. Managers should take into consideration these connections when designing stream management and restoration plans. Because ecologically successful stream management and restoration is expected to restore function as well as structure to streams, the use of appropriate measures of functional processes is required. Nutrient retention and metabolism parameters are good candidates to fill this gap.es_ES
dc.description.sponsorshipFinancial support was provided by projects RENITRAC (ref: REN2002-03592/HID) and NICON (ref: CGL2005-07362-C02) from the Spanish Ministry of Education and Science, and EUROLIMPACS (ref: GOCE-CT-2003-505540) from the European Commission. D. von Schiller held an I3P PhD scholarship from the Spanish Council for Scientific Research. Jane Marks was supported by sabbatical funding from the Spanish Ministry for Education and Science.es_ES
dc.publisherJohn Wiley & Sonses_ES
dc.subjectLand usees_ES
dc.subjectNutrient retentiones_ES
dc.titleInfluence of Land Use on Stream Ecosystem Function in a Mediterranean Catchmentes_ES
dc.description.peerreviewedPeer reviewedes_ES
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