Effects of flow intermittency and pharmaceutical exposure on the structure and metabolism of stream biofilms

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dc.contributor.author Corcoll i Cornet, Natàlia
dc.contributor.author Casellas, Maria
dc.contributor.author Huerta Buitrago, Belinda
dc.contributor.author Guasch i Padró, Helena
dc.contributor.author Acuña i Salazar, Vicenç
dc.contributor.author Rodríguez Mozaz, Sara
dc.contributor.author Serra Compte, Albert
dc.contributor.author Barceló i Cullerés, Damià
dc.contributor.author Sabater, Sergi
dc.date.issued 2015
dc.identifier.issn 0048-9697
dc.identifier.uri http://hdl.handle.net/10256/12352
dc.description.abstract Increasing concentrations of pharmaceutical compounds occur in many rivers, but their environmental risk remains poorly studied in stream biofilms. Flow intermittency shapes the structure and functions of ecosystems, and may enhance their sensitivity to toxicants. This study evaluates the effects of a long-term exposure of biofilm communities to a mixture of pharmaceutical compounds at environmental concentrations on biofilm bioaccumulation capacity, the structure and metabolic processes of algae and bacteria communities, and how their potential effects were enhanced or not by the occurrence of flow intermittency. To assess the interaction between those two stressors, an experiment with artificial streams was performed. Stream biofilms were exposed to a mixture of pharmaceuticals, as well as to a short period of flow intermittency. Results indicate that biofilms were negatively affected by pharmaceuticals. The algal biomass and taxa richness decreased and unicellular green algae relatively increased. The structure of the bacterial (based on denaturing gradient gel electrophoresis of amplified 16S rRNA genes) changed and showed a reduction of the operational taxonomic units (OTUs) richness. Exposed biofilms showed higher rates of metabolic processes, such as primary production and community respiration, attributed to pharmaceuticals stimulated an increase of green algae and heterotrophs, respectively. Flow intermittency modulated the effects of chemicals on natural communities. The algal community became more sensitive to short-term exposure of pharmaceuticals (lower EC50 value) when exposed to water intermittency, indicating cumulative effects between the two assessed stressors. In contrast to algae, the bacterial community became less sensitive to short-term exposure of pharmaceuticals (higher EC50) when exposed to water intermittency, indicating co-tolerance phenomena. According to the observed effects, the environmental risk of pharmaceuticals in nature is high, but different depending on the flow regime, as well as the target organisms (autotrophs vs heterotrophs)
dc.description.sponsorship This study was funded by the Spanish Ministry of Economy and Competitiveness through the project SCARCE (Consolider-Ingenio 2010 CSD2009-00065) and by the European Union through the European Regional Development Fund (ERDF)
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.relation MICINN/PN 2009-2014/CSD2009-00065
dc.relation.isformatof Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.scitotenv.2014.06.093
dc.relation.ispartof © Science of the Total Environment, 2015, vol. 503-504, p. 159-170
dc.relation.ispartofseries Articles publicats (D-CCAA)
dc.rights Tots els drets reservats
dc.subject Toxicologia ambiental
dc.subject Environmental toxicology
dc.subject Biofilms
dc.subject Contaminants emergents en l'aigua
dc.subject Emerging contaminants in water
dc.subject Aigua -- Contaminació
dc.subject Water -- Pollution
dc.title Effects of flow intermittency and pharmaceutical exposure on the structure and metabolism of stream biofilms
dc.type info:eu-repo/semantics/article
dc.rights.accessRights info:eu-repo/semantics/closedAccess
dc.embargo.terms Cap
dc.type.version info:eu-repo/semantics/publishedVersion
dc.identifier.doi http://dx.doi.org/10.1016/j.scitotenv.2014.06.093
dc.contributor.funder Ministerio de Ciencia e Innovación (Espanya)


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