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Can salinity trigger cascade effects on streams? A mesocosm approach

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dc.contributor Universitat de Vic - Universitat Central de Catalunya. Centre Tecnològic BETA
dc.contributor.author Cañedo-Argüelles, Miguel
dc.contributor.author Sala, Miquel
dc.contributor.author Peixoto, Gabriela
dc.contributor.author Prat, Narcís
dc.contributor.author Faria, Melissa
dc.contributor.author Soares, Amadeu M.V.M.
dc.contributor.author Barata, Carlos
dc.contributor.author Kefford, Ben
dc.date.accessioned 2015-11-12T13:07:06Z
dc.date.available 2015-11-12T13:07:06Z
dc.date.created 2016
dc.date.issued 2016
dc.identifier.citation Cañedo-Argüelles, M., Peixoto, G., Faria, M., Soares, A., Barata, C., Kefford B. (2015). Can salinity trigger cascade effects on streams? A mesocosm approach. The Science of the Total Environment, 540(1), 3-10 ca_ES
dc.identifier.issn 0048-9697
dc.identifier.uri http://hdl.handle.net/10854/4344
dc.description.abstract Human activities have greatly increased the salt concentration of the world's rivers, and this might be amplified by water scarcity in the future. While the lethal effects of salinity have been documented for a wide variety of stream invertebrates, the sub-lethal effects (i.e. changes in biological conditionwithout mortality) are not deeply understood yet. One important sub-lethal effect that has yet to be investigated is changes in predation efficiency, which could trigger cascade effects associated to the abundance of herbivorous invertebrates that control algae biomass. In this study we combined the use of biomarkers with community-level data in a stream mesocosm to evaluate the potential cascade effect of increased salinity on the trophic food web. Both predation and salt treatments had an effect on the aquatic invertebrate abundance, richness and community composition. The presence of predators had a clear cascade effect, it reduced herbivorous invertebrate abundance and richness leading to higher chlorophyll a concentrations. The salt treatment significantly reduced taxa richness, but only in the gravel bed. The predators were significantly stressed by salt addition, as shown by the different analyzed biomarkers. Concordantly, in the presence of predators, Tanytarsini registered higher abundances and chlorophyll a showed a lower concentration when salt was added. However, none of these changes was significant. Therefore, although salt addition significantly stressed Dina lineata, our results suggest that a longer exposure time is needed to fully capture cascading effects (e.g. a decrease in chlorophyll a due to a relaxation of predation on herbivorous invertebrates).We suggest that the potential cascade effects of salinization need to be evaluated when addressing the impacts of water scarcity (as caused by climate change and increasing water demand) on river ecosystems, since flow reductions will lead to higher salt concentrations. ca_ES
dc.format application/pdf
dc.format.extent 8 p. ca_ES
dc.language.iso eng ca_ES
dc.publisher Elsevier ca_ES
dc.rights Tots els drets reservats ca_ES
dc.rights (c) Elsevier
dc.subject.other Invertebrats aquàtics ca_ES
dc.subject.other Aigua -- Salinització ca_ES
dc.subject.other Depredació (Biologia) ca_ES
dc.title Can salinity trigger cascade effects on streams? A mesocosm approach ca_ES
dc.type info:eu-repo/semantics/article ca_ES
dc.identifier.doi https://doi.org/10.1016/j.scitotenv.2015.03.039
dc.rights.accesRights info:eu-repo/semantics/closedAccess ca_ES
dc.type.version info:eu-repo/publishedVersion ca_ES
dc.indexacio Indexat a SCOPUS ca_ES

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