Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon
Genetic 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 th...
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ftzenodo:oai:zenodo.org:5552654 2024-09-15T17:56:08+00:00 Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon Wacker, Sebastian Skaug, Hans Forseth, Torbjørn Solem, Øyvind Ulvan, Eva Fiske, Peder Karlsson, Sten 2022-01-24 https://doi.org/10.5061/dryad.12jm63xxb unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.12jm63xxb oai:zenodo.org:5552654 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Salmo salar close-kin mark-recapture population size estimation info:eu-repo/semantics/other 2022 ftzenodo https://doi.org/10.5061/dryad.12jm63xxb 2024-07-27T02:50:23Z Genetic 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. See README file. Funding provided by: Norwegian ... Other/Unknown Material Atlantic salmon Salmo salar Zenodo |
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Open Polar |
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ftzenodo |
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topic |
Salmo salar close-kin mark-recapture population size estimation |
spellingShingle |
Salmo salar close-kin mark-recapture population size estimation Wacker, Sebastian Skaug, Hans Forseth, Torbjørn Solem, Øyvind Ulvan, Eva Fiske, Peder Karlsson, Sten Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
topic_facet |
Salmo salar close-kin mark-recapture population size estimation |
description |
Genetic 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. See README file. Funding provided by: Norwegian ... |
format |
Other/Unknown Material |
author |
Wacker, Sebastian Skaug, Hans Forseth, Torbjørn Solem, Øyvind Ulvan, Eva Fiske, Peder Karlsson, Sten |
author_facet |
Wacker, Sebastian Skaug, Hans Forseth, Torbjørn Solem, Øyvind Ulvan, Eva Fiske, Peder Karlsson, Sten |
author_sort |
Wacker, Sebastian |
title |
Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
title_short |
Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
title_full |
Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
title_fullStr |
Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
title_full_unstemmed |
Considering sampling bias in close-kin mark-recapture (CKMR) abundance estimates of Atlantic salmon |
title_sort |
considering sampling bias in close-kin mark-recapture (ckmr) abundance estimates of atlantic salmon |
publisher |
Zenodo |
publishDate |
2022 |
url |
https://doi.org/10.5061/dryad.12jm63xxb |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.12jm63xxb oai:zenodo.org:5552654 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.12jm63xxb |
_version_ |
1810432347651178496 |