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dc.contributor.authorHeggenes, Jan
dc.contributor.authorStickler, Morten
dc.contributor.authorAlfredsen, Knut
dc.contributor.authorBrittain, John Edward
dc.contributor.authorAdeva Bustos, Ana
dc.contributor.authorHuusko, Ari
dc.identifier.citationRivers Research and Applications: an international journal devoted to river research and management. 2021, 1-23.en_US
dc.description.abstractWater temperatures control life histories and diversity of aquatic species. Hydropower regulation, particularly in high head systems, alters natural water temperature regimes, which may have profound and long-term impacts on aquatic environments. Temperatures in by-pass sections and reaches affected by residual/environmental minimum flows fluctuate more than in natural flow regimes, driven more by influence of air temperatures. Reaches downstream of power plant outlets tend to become warmer in winter and colder in summer, driven by stratification behind the reservoir dam. In hydro-peaked systems high-low temperature effects may thus be aggravated. We review alterations of hydropower to natural thermal regimes, impacts on key organisms in terms of survival, development and behavioral thresholds, and potential mitigation measures, with focus on Atlantic salmon and brown trout in high northern latitude stream systems. Previous syntheses have focused mainly on flow changes and ecological impacts. Temperature effects may not always be correlated with flow changes, although there are some unique challenges with temperature changes in far northern latitudes, for example, related to the seasonal and colder climates. To help knowledge-based management and identify potential knowledge gaps, we review how hydropower regulation may impact seasonal water temperatures, what impacts changes to stream system temperature regimes may have to key organisms, for example, Atlantic salmon and brown trout, and what adaptations and behavioral variations they may exhibit to respond to changed temperature regimes, and finally what good practices can be recommended for mitigating temperature impacts. This synthesis indicates that there are impacts to the fish and their supporting food webs, in particular related to growth and development, and the potential for negative impacts seems higher, and better studied, than positive impacts in northern river systems. Some of these impacts may be modified by directed hydropower regulation practices, but here effect studies and knowledge are limited.en_US
dc.publisherWiley Online Libraryen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleHydropower‐driven thermal changes, biological responses and mitigating measures in northern river systemsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.source.journalRivers Research and Applications: an international journal devoted to river research and managementen_US
dc.description.localcodeThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. © 2021 The Authors. River Research and Applications published by John Wiley & Sons Ltden_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal