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dc.contributor.authorKlutsch, Cornelya
dc.contributor.authorMaduna, Simo
dc.contributor.authorPolikarpova, Natalia
dc.contributor.authorForfang, Kristin
dc.contributor.authorAspholm, Paul Eric
dc.contributor.authorNyman, Tommi
dc.contributor.authorEiken, Hans Geir
dc.contributor.authorAmundsen, Per-Arne
dc.contributor.authorHagen, Snorre
dc.coverage.spatialPasvikelva, The Pasvik River, Norway, Finland, Russianb_NO
dc.date.accessioned2019-08-22T10:39:28Z
dc.date.available2019-08-22T10:39:28Z
dc.date.created2019-06-24T15:06:06Z
dc.date.issued2019-04-29
dc.identifier.citationEcology and Evolution. 2019, 9 (10), 6068-6081.nb_NO
dc.identifier.issn2045-7758
dc.identifier.urihttp://hdl.handle.net/11250/2609804
dc.description.abstractHabitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and decline worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (Salmo trutta L.) is an ideal model species for studying anthropogenic influences on genetic integrity, as it has experienced significant genetic alterations throughout its natural distribution range due to habitat fragmentation, overexploitation, translocations, and stocking. The Pasvik River is a subarctic riverine system shared between Norway, Russia, and Finland, subdivided by seven hydroelectric power dams that destroyed about 70% of natural spawning and nursing areas. Stocking is applied in certain river parts to support the natural brown trout population. Adjacent river segments with different management strategies (stocked vs. not stocked) facilitated the simultaneous assessment of genetic impacts of dams and stocking based on analyses of 16 short tandem repeat loci. Dams were expected to increase genetic differentiation between and reduce genetic diversity within river sections. Contrastingly, stocking was predicted to promote genetic homogenization and diversity, but also potentially lead to loss of private alleles and to genetic erosion. Our results showed comparatively low heterozygosity and clear genetic differentiation between adjacent sections in nonstocked river parts, indicating that dams prevent migration and contribute to genetic isolation and loss of genetic diversity. Furthermore, genetic differentiation was low and heterozygosity relatively high across stocked sections. However, in stocked river sections, we found signatures of recent bottlenecks and reductions in private alleles, indicating that only a subset of individuals contributes to reproduction, potentially leading to divergence away from the natural genetic state. Taken together, these results indicate that stocking counteracts the negative fragmentation effects of dams, but also that stocking practices should be planned carefully in order to ensure long‐term preservation of natural genetic diversity and integrity in brown trout and other species in regulated river systems.nb_NO
dc.language.isoengnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.subjectFish stockingnb_NO
dc.subjectGenetic diversitynb_NO
dc.subjectGenetic erosionnb_NO
dc.subjectGenetic integritynb_NO
dc.subjectHabitat fragmentationnb_NO
dc.subjectSalma truttanb_NO
dc.titleGenetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine systemnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.subject.nsiVDP::Landbruks- og Fiskerifag: 900::Landbruksfag: 910nb_NO
dc.source.pagenumber6068-6081nb_NO
dc.source.volume9nb_NO
dc.source.journalEcology and Evolutionnb_NO
dc.source.issue10nb_NO
dc.identifier.doi10.1002/ece3.5191
dc.identifier.cristin1707326
cristin.unitcode7677,4,0,0
cristin.unitcode7677,2,0,0
cristin.unitnameDivisjon for miljø og naturressurser
cristin.unitnameDivisjon for skog og utmark
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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