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dc.contributor.authorPereda Iriondo, Olatz
dc.contributor.authorAcuña Salazar, Vicenç
dc.contributor.authorVon Schiller Calle, Daniel Gaspar
dc.contributor.authorSabater, Sergi
dc.contributor.authorElosegi Irurtia, Arturo
dc.identifier.citationEcotoxicology And Environmental Safety 169 : 960-970 (2019)es_ES
dc.description.abstractEffluents from urban wastewater treatment plants (WWTP) consist of complex mixtures of substances that can affect processes in the receiving ecosystems. Some of these substances (toxic contaminants) stress biological activity at all concentrations, while others (e.g., nutrients) subsidize it at low concentrations and stress it above a threshold, causing subsidy-stress responses. Thus, the overall effects of WWTP effluents depend mostly on their composition and the dilution capacity of the receiving water bodies. We assessed the immediate and legacy effects of WWTP effluents in artificial streams, where we measured the uptake of soluble reactive phosphorus (SRP) by the biofilm, biomass accrual, benthic metabolism and organic matter decomposition (OMD). In a first phase (32 d), the channels were subjected to a gradient of effluent contribution, from pure stream water to pure effluent. WWTP effluent affected the ecosystem processes we measured, although we found no clear subsidy-stress patterns except for biofilm biomass accrual. Instead, most of the processes were subsidized, although they showed complex and process-specific patterns. Benthic metabolism and OMD were subsidized without saturation, as they peaked at medium and high levels of pollution, respectively, but they never fell below control levels. SRP uptake was the only process that decreased with increasing effluent concentration. In a second phase of the experiment (23 d), all channels were kept on pure stream water to analyse the legacy effects of the effluent. For most of the processes, there were clear legacy effects, which followed either subsidy, stress, or subsidy-stress patterns. SRP uptake capacity was stressed with increasing pollution legacy, whereas algal accrual and benthic metabolism continued being subsidized. Conversely, biofilm biomass accrual and OMD showed no legacy effects. Overall, the WWTP effluent caused complex and process-specific responses in our experiment, mainly driven by the mixed contribution of subsidizers and stressors. These results help improving our understanding of the effects of urban pollution on stream ecosystem functioning. Copyright © 2018 The Authors. Published by Elsevier Inc. All rights reserved.es_ES
dc.description.sponsorshipThis research was supported by the European Union 7th Framework Programme (GLOBAQUA; 603629-ENV-2013-6.2.1). Authors also acknowledge the financial support from the University of the Basque Country (pre-doctoral fellowship to O. Pereda), the Basque Government (Consolidated Research Group: Stream Ecology 7-CA-18/10), and the Economy and Knowledge Department of the Catalan Government (Consolidated Research Group: ICRA-ENV 2017 SGR 1124). Authors are also especially grateful to Maria Casellas, Carme Font, Carmen Gutiérrez, Ferran Romero and Laia Sabater-Liesa for their assistance during the laboratory experiments.es_ES
dc.subjectartificial streames_ES
dc.subjectecosystem functioninges_ES
dc.subjectpollution gradientes_ES
dc.subjectWWTP effluentes_ES
dc.titleImmediate and Legacy Effects of Urban Pollution on River Ecosystem Functioning: a Mesocosm Experimentes_ES
dc.rights.holder0147-6513/ © 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (
dc.rights.holderAtribución-NoComercial-SinDerivadas 3.0 España*
dc.departamentoesBiología vegetal y ecologíaes_ES
dc.departamentoeuLandaren biologia eta ekologiaes_ES

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0147-6513/ © 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license 
Except where otherwise noted, this item's license is described as 0147-6513/ © 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (