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dc.contributor.authorRocaspana, Rafel
dc.contributor.authorAparicio, Enric
dc.contributor.authorVinyoles Cartanyà, Dolors
dc.contributor.authorPalau, Antoni
dc.date.accessioned2018-01-26T11:22:53Z
dc.date.available2018-01-26T11:22:53Z
dc.date.issued2016
dc.identifier.issn0175-8659
dc.identifier.urihttp://hdl.handle.net/10459.1/62557
dc.description.abstractThe influence of pulsed discharges associated with hydroelectric power generation (i.e. hydropeaking) on feeding activity and diet composition of adult brown trout (Salmo trutta) was studied during the summer by comparing two sites: upstream (control site) and downstream from a power plant (hydropeaking site). Twenty fish were captured from each study site by electrofishing at 4-hour intervals for two consecutive days and stomach contents were collected with pulsed gastric lavage. Hydropeaking events affected brown trout feeding behaviour as well as prey availability. Feeding intensity, measured by the stomach Fullness Index, showed pronounced variations with maximum values after flow pulses, which were linked to variations in prey availability because of increased drift rates of invertebrates. In contrast, brown trout living at the control site showed smoother variations in feeding activity not linked to invertebrate drift. Overall, brown trout at the hydropeaking site had higher food consumption rates and a more generalist and heterogeneous diet than trout from the control site, indicating an opportunistic feeding behaviour during flow pulses. Therefore, the hydrological disturbance caused by hydropeaking did not appear to cause direct negative impacts on feeding of adult brown trout. However, reduced trout density and imbalanced size structure in the hydropeaking site were detected, requiring further research to clarify the spatial influence of hydropeaking on other factors that could negatively affect brown trout populations.
dc.description.sponsorshipThe study was financially sup-ported by Endesa, S.A. under its Biodiversity Conservation Plan.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherWiley
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1111/jai.13022
dc.relation.ispartofJournal of Applied Ichthyology-Zeitschrift für Angewandte Ichthyologie, 2016, vol. 32, num. 1, p. 190-197
dc.rights(c) Blackwell Verlag GmbH, 2016
dc.subject.classificationTruites (Peixos)
dc.subject.classificationNutrició animal
dc.subject.classificationCentrals hidroelèctriques
dc.subject.classificationInfluència de l'home en la natura
dc.subject.otherTrout
dc.subject.otherAnimal nutrition
dc.subject.otherHydroelectric power plants
dc.subject.otherEffect of human beings on nature
dc.titleEffects of pulsed discharges from a hydropower station on summer diel feeding activity and diet of brown trout (Salmo trutta Linnaeus, 1758) in an Iberian stream
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2018-01-26T11:22:55Z
dc.identifier.idgrec024664
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1111/jai.13022


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