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dc.contributor.authorWacker, Sebastian
dc.contributor.authorSkaug, Hans Julius
dc.contributor.authorForseth, Torbjørn
dc.contributor.authorSolem, Øyvind
dc.contributor.authorUlvan, Eva Marita
dc.contributor.authorFiske, Peder
dc.contributor.authorKarlsson, Sten
dc.description.abstractGenetic methods for the estimation of population size can be powerful alternatives to conventional methods. Close-kin mark–recapture (CKMR) is based on the principles of conventional mark–recapture, but instead of being physically marked, individuals are marked through their close kin. The aim of this study was to evaluate the potential of CKMR for the estimation of spawner abundance in Atlantic salmon and how age, sex, spatial, and temporal sampling bias may affect CKMR estimates. Spawner abundance in a wild population was estimated from genetic samples of adults returning in 2018 and of their potential offspring collected in 2019. Adult samples were obtained in two ways. First, adults were sampled and released alive in the breeding habitat during spawning surveys. Second, genetic samples were collected from out-migrating smolts PIT-tagged in 2017 and registered when returning as adults in 2018. CKMR estimates based on adult samples collected during spawning surveys were somewhat higher than conventional counts. Uncertainty was small (CV < 0.15), due to the detection of a high number of parent–offspring pairs. Sampling of adults was age- and size-biased and correction for those biases resulted in moderate changes in the CKMR estimate. Juvenile dispersal was limited, but spatially balanced sampling of adults rendered CKMR estimates robust to spatially biased sampling of juveniles. CKMR estimates based on returning PIT-tagged adults were approximately twice as high as estimates based on samples collected during spawning surveys. We suggest that estimates based on PIT-tagged fish reflect the total abundance of adults entering the river, while estimates based on samples collected during spawning surveys reflect the abundance of adults present in the breeding habitat at the time of spawning. Our study showed that CKMR can be used to estimate spawner abundance in Atlantic salmon, with a moderate sampling effort, but a carefully designed sampling regime is required.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleConsidering sampling bias in close-kin mark–recapture abundance estimates of Atlantic salmonen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2021 The Authors.en_US
dc.source.journalEcology and Evolutionen_US
dc.relation.projectAndre: County Governor of Trøndelagen_US
dc.relation.projectAndre: Norwegian Reserarch Centre for Hydropower TechnologyHydroCenen_US
dc.relation.projectAndre: Norwegian Environment Agencyen_US
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480en_US
dc.subject.nsiVDP::Zoology and botany: 480en_US
dc.identifier.citationEcology and Evolution. 2021, 11 (9), 3917-3932.en_US

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