Salmon on the lam: Drivers of escaped farmed fish abundance in rivers
Abstract The production of Atlantic salmon in aquaculture has grown substantially over the last 40 years. The unintentional release of domesticated salmon poses a significant risk to the long‐term persistence of wild Atlantic salmon populations through ecological interactions and genetic introgressi...
Published in: | Journal of Applied Ecology |
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Online Access: | http://dx.doi.org/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13804 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 |
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crwiley:10.1111/1365-2664.13804 2024-06-09T07:44:42+00:00 Salmon on the lam: Drivers of escaped farmed fish abundance in rivers Mahlum, Shad Vollset, Knut Wiik Barlaup, Bjørn T. Skoglund, Helge Velle, Gaute He, Qiang Universitetet i Bergen Miljødirektoratet 2020 http://dx.doi.org/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13804 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Applied Ecology volume 58, issue 3, page 550-561 ISSN 0021-8901 1365-2664 journal-article 2020 crwiley https://doi.org/10.1111/1365-2664.13804 2024-05-16T14:24:23Z Abstract The production of Atlantic salmon in aquaculture has grown substantially over the last 40 years. The unintentional release of domesticated salmon poses a significant risk to the long‐term persistence of wild Atlantic salmon populations through ecological interactions and genetic introgression. Our ability to link aquaculture production to farmed escaped salmon in rivers is still limited and hinders identifying the appropriate production capacity of salmon aquaculture to reduce unwanted interactions between wild and escaped Atlantic salmon. Here we use a 14‐year dataset of farmed escapee abundance in rivers to model how the a priori selected covariables of wild salmon abundance, aquaculture intensity, river discharge, hydropower and fjord placement of the river affects escapee abundance across 54 rivers in western Norway. Then, we evaluate the predictive strength of the model to provide context for its use to minimize escapees. We found that the abundance of escaped farmed Atlantic salmon in rivers is correlated to aquaculture intensity. Furthermore, the abundance of wild Atlantic salmon, mean yearly discharge, and the interaction between fjord placement and wild salmon abundance were important predictors of escapee abundance in rivers. The model was 40% accurate when predicting the abundance of farmed escaped salmon in rivers. However, the accuracy improved to 75% when using risk categories derived from modelled intrusion rates that induced long‐term genetic changes to the wild population (low < 4%, medium 4%–10%, and high > 10% escaped farmed salmon). Synthesis and applications . This study links aquaculture production, at relevant spatiotemporal scales (75 km from rivers), to the abundance of escaped farmed Atlantic salmon in rivers, and provides governmental agencies with a tool to help regulate domesticated salmon production based on the carrying capacity of the system to buffer against introgression between conspecifics. Furthermore, understanding this relationship will be beneficial when ... Article in Journal/Newspaper Atlantic salmon Wiley Online Library Norway Journal of Applied Ecology 58 3 550 561 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The production of Atlantic salmon in aquaculture has grown substantially over the last 40 years. The unintentional release of domesticated salmon poses a significant risk to the long‐term persistence of wild Atlantic salmon populations through ecological interactions and genetic introgression. Our ability to link aquaculture production to farmed escaped salmon in rivers is still limited and hinders identifying the appropriate production capacity of salmon aquaculture to reduce unwanted interactions between wild and escaped Atlantic salmon. Here we use a 14‐year dataset of farmed escapee abundance in rivers to model how the a priori selected covariables of wild salmon abundance, aquaculture intensity, river discharge, hydropower and fjord placement of the river affects escapee abundance across 54 rivers in western Norway. Then, we evaluate the predictive strength of the model to provide context for its use to minimize escapees. We found that the abundance of escaped farmed Atlantic salmon in rivers is correlated to aquaculture intensity. Furthermore, the abundance of wild Atlantic salmon, mean yearly discharge, and the interaction between fjord placement and wild salmon abundance were important predictors of escapee abundance in rivers. The model was 40% accurate when predicting the abundance of farmed escaped salmon in rivers. However, the accuracy improved to 75% when using risk categories derived from modelled intrusion rates that induced long‐term genetic changes to the wild population (low < 4%, medium 4%–10%, and high > 10% escaped farmed salmon). Synthesis and applications . This study links aquaculture production, at relevant spatiotemporal scales (75 km from rivers), to the abundance of escaped farmed Atlantic salmon in rivers, and provides governmental agencies with a tool to help regulate domesticated salmon production based on the carrying capacity of the system to buffer against introgression between conspecifics. Furthermore, understanding this relationship will be beneficial when ... |
author2 |
He, Qiang Universitetet i Bergen Miljødirektoratet |
format |
Article in Journal/Newspaper |
author |
Mahlum, Shad Vollset, Knut Wiik Barlaup, Bjørn T. Skoglund, Helge Velle, Gaute |
spellingShingle |
Mahlum, Shad Vollset, Knut Wiik Barlaup, Bjørn T. Skoglund, Helge Velle, Gaute Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
author_facet |
Mahlum, Shad Vollset, Knut Wiik Barlaup, Bjørn T. Skoglund, Helge Velle, Gaute |
author_sort |
Mahlum, Shad |
title |
Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
title_short |
Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
title_full |
Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
title_fullStr |
Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
title_full_unstemmed |
Salmon on the lam: Drivers of escaped farmed fish abundance in rivers |
title_sort |
salmon on the lam: drivers of escaped farmed fish abundance in rivers |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13804 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13804 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Journal of Applied Ecology volume 58, issue 3, page 550-561 ISSN 0021-8901 1365-2664 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2664.13804 |
container_title |
Journal of Applied Ecology |
container_volume |
58 |
container_issue |
3 |
container_start_page |
550 |
op_container_end_page |
561 |
_version_ |
1801373501725081600 |