Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness
Interbreeding between artificially-selected and wild organisms can have negative fitness consequences for the latter. In the Northwest Atlantic, farmed Atlantic salmon recurrently escape into the wild and enter rivers where small, declining populations of wild salmon breed. Most farmed salmon in the...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352379 https://doi.org/10.1111/j.1752-4571.2008.00037.x |
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ftpubmed:oai:pubmedcentral.nih.gov:3352379 2023-05-15T15:32:29+02:00 Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness Fraser, Dylan J Cook, Adam M Eddington, James D Bentzen, Paul Hutchings, Jeffrey A 2008-08 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352379 https://doi.org/10.1111/j.1752-4571.2008.00037.x en eng Blackwell Publishing Ltd http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352379 http://dx.doi.org/10.1111/j.1752-4571.2008.00037.x © 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd Original Articles Text 2008 ftpubmed https://doi.org/10.1111/j.1752-4571.2008.00037.x 2013-09-04T07:15:22Z Interbreeding between artificially-selected and wild organisms can have negative fitness consequences for the latter. In the Northwest Atlantic, farmed Atlantic salmon recurrently escape into the wild and enter rivers where small, declining populations of wild salmon breed. Most farmed salmon in the region derive from an ancestral source population that occupies a nonacidified river (pH 6.0–6.5). Yet many wild populations with which escaped farmed salmon might interbreed inhabit acidified rivers (pH 4.6–5.2). Using common garden experimentation, and examining two early-life history stages across two generations of interbreeding, we showed that wild salmon populations inhabiting acidified rivers had higher survival at acidified pH than farmed salmon or F1 farmed-wild hybrids. In contrast, however, there was limited evidence for reduced performance in backcrosses, and F2 farmed-wild hybrids performed better or equally well to wild salmon. Wild salmon also survived or grew better at nonacidified than acidified pH, and wild and farmed salmon survived equally well at nonacidified pH. Thus, for acid tolerance and the stages examined, we found some evidence both for and against the theory that repeated farmed-wild interbreeding may reduce adaptive genetic variation in the wild and thereby negatively affect the persistence of depleted wild populations. Text Atlantic salmon Northwest Atlantic PubMed Central (PMC) Evolutionary Applications 1 3 501 512 |
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Original Articles |
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Original Articles Fraser, Dylan J Cook, Adam M Eddington, James D Bentzen, Paul Hutchings, Jeffrey A Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
topic_facet |
Original Articles |
description |
Interbreeding between artificially-selected and wild organisms can have negative fitness consequences for the latter. In the Northwest Atlantic, farmed Atlantic salmon recurrently escape into the wild and enter rivers where small, declining populations of wild salmon breed. Most farmed salmon in the region derive from an ancestral source population that occupies a nonacidified river (pH 6.0–6.5). Yet many wild populations with which escaped farmed salmon might interbreed inhabit acidified rivers (pH 4.6–5.2). Using common garden experimentation, and examining two early-life history stages across two generations of interbreeding, we showed that wild salmon populations inhabiting acidified rivers had higher survival at acidified pH than farmed salmon or F1 farmed-wild hybrids. In contrast, however, there was limited evidence for reduced performance in backcrosses, and F2 farmed-wild hybrids performed better or equally well to wild salmon. Wild salmon also survived or grew better at nonacidified than acidified pH, and wild and farmed salmon survived equally well at nonacidified pH. Thus, for acid tolerance and the stages examined, we found some evidence both for and against the theory that repeated farmed-wild interbreeding may reduce adaptive genetic variation in the wild and thereby negatively affect the persistence of depleted wild populations. |
format |
Text |
author |
Fraser, Dylan J Cook, Adam M Eddington, James D Bentzen, Paul Hutchings, Jeffrey A |
author_facet |
Fraser, Dylan J Cook, Adam M Eddington, James D Bentzen, Paul Hutchings, Jeffrey A |
author_sort |
Fraser, Dylan J |
title |
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
title_short |
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
title_full |
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
title_fullStr |
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
title_full_unstemmed |
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
title_sort |
mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness |
publisher |
Blackwell Publishing Ltd |
publishDate |
2008 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352379 https://doi.org/10.1111/j.1752-4571.2008.00037.x |
genre |
Atlantic salmon Northwest Atlantic |
genre_facet |
Atlantic salmon Northwest Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352379 http://dx.doi.org/10.1111/j.1752-4571.2008.00037.x |
op_rights |
© 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd |
op_doi |
https://doi.org/10.1111/j.1752-4571.2008.00037.x |
container_title |
Evolutionary Applications |
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1 |
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3 |
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501 |
op_container_end_page |
512 |
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1766362978080260096 |