Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations
Throughout their native range, wild Atlantic salmon populations are threatened by hybridization and introgression with escapees from net-pen salmon aquaculture. Although domestic-wild hybrid offspring have shown reduced fitness in lab and field experiments, consequential impacts on population abunda...
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ftdryad:oai:v1.datadryad.org:10255/dryad.199874 2023-05-15T15:32:12+02:00 Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations Sylvester, Emma V.A. Wringe, Brendan F. Duffy, Steven J. Hamilton, Lorraine C. Fleming, Ian A. Castellani, Marco Bentzen, Paul Bradbury, Ian R. 2018-11-27T19:38:51Z http://hdl.handle.net/10255/dryad.199874 https://doi.org/10.5061/dryad.2kc5rh0 unknown doi:10.5061/dryad.2kc5rh0/1 doi:10.5061/dryad.2kc5rh0/2 doi:10.1111/eva.12746 doi:10.5061/dryad.2kc5rh0 Sylvester EVA, Wringe BF, Duffy SJ, Hamilton LC, Fleming IA, Castellani M, Bentzen P, Bradbury IR (2019) Estimating the relative fitness of escaped farmed salmon offspring in the wild and modelling the consequences of invasion for wild populations. Evolutionary Applications 12(4): 705-717. http://hdl.handle.net/10255/dryad.199874 fish farming Salmo salar aquaculture impacts introgression relative fitness population eco-genetic modelling Article 2018 ftdryad https://doi.org/10.5061/dryad.2kc5rh0 https://doi.org/10.5061/dryad.2kc5rh0/1 https://doi.org/10.5061/dryad.2kc5rh0/2 https://doi.org/10.1111/eva.12746 2020-01-01T16:19:51Z Throughout their native range, wild Atlantic salmon populations are threatened by hybridization and introgression with escapees from net-pen salmon aquaculture. Although domestic-wild hybrid offspring have shown reduced fitness in lab and field experiments, consequential impacts on population abundance and genetic integrity remain difficult to predict in the field, in part because the strength of selection against domestic offspring is often unknown and context-dependent. Here we follow a single large escape event of farmed Atlantic salmon in southern Newfoundland and monitor changes in the in-river proportions of hybrids and feral individuals over time using genetically-based hybrid identification. Over a three-year period following the escape, the overall proportion of wild parr increased consistently (total wild proportion of 71.6%, 75.1%, 87.5% each year, respectively), with subsequent declines in feral (genetically pure farmed individuals originating from escaped, farmed adults) and hybrid parr. We quantify the strength of selection against parr of aquaculture ancestry and explore the genetic and demographic consequences for populations in the region. Within-cohort changes in the relative proportions of feral and F1 parr suggest reduced relative survival compared to wild individuals over the first (0.15 and 0.81 for feral and F1, respectively), and second years of life (0.26, 0.83). These relative survivorship estimates were used to inform an individual-based salmon eco-genetic model to project changes in adult abundance and overall allele frequency across three invasion scenarios ranging from short-term to long-term invasion and three relative survival scenarios. Modeling results indicate that total population abundance and time to recovery were greatly affected by relative survivorship and predict significant declines in wild population abundance under continued large escape events and calculated survivorship. Overall this work demonstrates the importance of estimating the strength of selection against domestic offspring in the wild to predict the long-term impact of farmed salmon escape events on wild populations. Article in Journal/Newspaper Atlantic salmon Newfoundland Salmo salar Dryad Digital Repository (Duke University) |
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Open Polar |
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Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
fish farming Salmo salar aquaculture impacts introgression relative fitness population eco-genetic modelling |
spellingShingle |
fish farming Salmo salar aquaculture impacts introgression relative fitness population eco-genetic modelling Sylvester, Emma V.A. Wringe, Brendan F. Duffy, Steven J. Hamilton, Lorraine C. Fleming, Ian A. Castellani, Marco Bentzen, Paul Bradbury, Ian R. Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
topic_facet |
fish farming Salmo salar aquaculture impacts introgression relative fitness population eco-genetic modelling |
description |
Throughout their native range, wild Atlantic salmon populations are threatened by hybridization and introgression with escapees from net-pen salmon aquaculture. Although domestic-wild hybrid offspring have shown reduced fitness in lab and field experiments, consequential impacts on population abundance and genetic integrity remain difficult to predict in the field, in part because the strength of selection against domestic offspring is often unknown and context-dependent. Here we follow a single large escape event of farmed Atlantic salmon in southern Newfoundland and monitor changes in the in-river proportions of hybrids and feral individuals over time using genetically-based hybrid identification. Over a three-year period following the escape, the overall proportion of wild parr increased consistently (total wild proportion of 71.6%, 75.1%, 87.5% each year, respectively), with subsequent declines in feral (genetically pure farmed individuals originating from escaped, farmed adults) and hybrid parr. We quantify the strength of selection against parr of aquaculture ancestry and explore the genetic and demographic consequences for populations in the region. Within-cohort changes in the relative proportions of feral and F1 parr suggest reduced relative survival compared to wild individuals over the first (0.15 and 0.81 for feral and F1, respectively), and second years of life (0.26, 0.83). These relative survivorship estimates were used to inform an individual-based salmon eco-genetic model to project changes in adult abundance and overall allele frequency across three invasion scenarios ranging from short-term to long-term invasion and three relative survival scenarios. Modeling results indicate that total population abundance and time to recovery were greatly affected by relative survivorship and predict significant declines in wild population abundance under continued large escape events and calculated survivorship. Overall this work demonstrates the importance of estimating the strength of selection against domestic offspring in the wild to predict the long-term impact of farmed salmon escape events on wild populations. |
format |
Article in Journal/Newspaper |
author |
Sylvester, Emma V.A. Wringe, Brendan F. Duffy, Steven J. Hamilton, Lorraine C. Fleming, Ian A. Castellani, Marco Bentzen, Paul Bradbury, Ian R. |
author_facet |
Sylvester, Emma V.A. Wringe, Brendan F. Duffy, Steven J. Hamilton, Lorraine C. Fleming, Ian A. Castellani, Marco Bentzen, Paul Bradbury, Ian R. |
author_sort |
Sylvester, Emma V.A. |
title |
Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
title_short |
Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
title_full |
Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
title_fullStr |
Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
title_full_unstemmed |
Data from: Estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
title_sort |
data from: estimating the relative fitness of escaped farmed salmon offspring in the wild and modeling the consequences of invasion for wild populations |
publishDate |
2018 |
url |
http://hdl.handle.net/10255/dryad.199874 https://doi.org/10.5061/dryad.2kc5rh0 |
genre |
Atlantic salmon Newfoundland Salmo salar |
genre_facet |
Atlantic salmon Newfoundland Salmo salar |
op_relation |
doi:10.5061/dryad.2kc5rh0/1 doi:10.5061/dryad.2kc5rh0/2 doi:10.1111/eva.12746 doi:10.5061/dryad.2kc5rh0 Sylvester EVA, Wringe BF, Duffy SJ, Hamilton LC, Fleming IA, Castellani M, Bentzen P, Bradbury IR (2019) Estimating the relative fitness of escaped farmed salmon offspring in the wild and modelling the consequences of invasion for wild populations. Evolutionary Applications 12(4): 705-717. http://hdl.handle.net/10255/dryad.199874 |
op_doi |
https://doi.org/10.5061/dryad.2kc5rh0 https://doi.org/10.5061/dryad.2kc5rh0/1 https://doi.org/10.5061/dryad.2kc5rh0/2 https://doi.org/10.1111/eva.12746 |
_version_ |
1766362708292141056 |