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: | https://doi.org/10.1111/j.1752-4571.2008.00037.x http://hdl.handle.net/10222/28669 |
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ftdalhouse:oai:DalSpace.library.dal.ca:10222/28669 2023-05-15T15:32:31+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. 2013-07-04T14:53:50Z https://doi.org/10.1111/j.1752-4571.2008.00037.x http://hdl.handle.net/10222/28669 unknown Evolutionary Applications 1752-4571 http://dx.doi.org/10.1111/j.1752-4571.2008.00037.x http://hdl.handle.net/10222/28669 1 3 501 article 2013 ftdalhouse https://doi.org/10.1111/j.1752-4571.2008.00037.x 2021-12-29T18:08:45Z 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 F(1) farmed-wild hybrids. In contrast, however, there was limited evidence for reduced performance in backcrosses, and F(2) 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. Article in Journal/Newspaper Atlantic salmon Northwest Atlantic Dalhousie University: DalSpace Institutional Repository Evolutionary Applications 1 3 501 512 |
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Dalhousie University: DalSpace Institutional Repository |
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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 F(1) farmed-wild hybrids. In contrast, however, there was limited evidence for reduced performance in backcrosses, and F(2) 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 |
Article in Journal/Newspaper |
author |
Fraser, Dylan J. Cook, Adam M. Eddington, James D. Bentzen, Paul Hutchings, Jeffrey A. |
spellingShingle |
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 |
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 |
publishDate |
2013 |
url |
https://doi.org/10.1111/j.1752-4571.2008.00037.x http://hdl.handle.net/10222/28669 |
genre |
Atlantic salmon Northwest Atlantic |
genre_facet |
Atlantic salmon Northwest Atlantic |
op_relation |
Evolutionary Applications 1752-4571 http://dx.doi.org/10.1111/j.1752-4571.2008.00037.x http://hdl.handle.net/10222/28669 1 3 501 |
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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1766363010015690752 |