Seasonal temperature regulates network connectivity of salmon louse
Chronically high infestation of salmon louse (Lepeophtheirus salmonis) questions the sustainability of the Norwegian Atlantic salmon (Salmo salar) aquaculture industry. The confinement of millions of hosts, within hundreds of farms with overlapping larval dispersal kernels create the structure for e...
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Language: | English |
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Online Access: | https://hdl.handle.net/11250/3022151 https://doi.org/10.1093/icesjms/fsac024 |
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ftimr:oai:imr.brage.unit.no:11250/3022151 2023-05-15T15:32:28+02:00 Seasonal temperature regulates network connectivity of salmon louse Huserbråten, Mats Brockstedt Olsen Johnsen, Ingrid Askeland 2022 application/pdf https://hdl.handle.net/11250/3022151 https://doi.org/10.1093/icesjms/fsac024 eng eng ICES Journal of Marine Science. 2022, 79 (4), 1075-1082. urn:issn:1054-3139 https://hdl.handle.net/11250/3022151 https://doi.org/10.1093/icesjms/fsac024 cristin:2055218 1075-1082 79 ICES Journal of Marine Science 4 Peer reviewed Journal article 2022 ftimr https://doi.org/10.1093/icesjms/fsac024 2022-10-05T22:42:26Z Chronically high infestation of salmon louse (Lepeophtheirus salmonis) questions the sustainability of the Norwegian Atlantic salmon (Salmo salar) aquaculture industry. The confinement of millions of hosts, within hundreds of farms with overlapping larval dispersal kernels create the structure for extremely persistent parasite meta-populations. However, the processes regulating the temporal variation in cross-contamination of pelagic salmon louse stages among farms (i.e. connectivity), a vital process driving louse population dynamics, are not well described. Here, we employ a data driven biophysical dispersal model that reproduces three-and-a-half years of production histories of 132 salmon farms in western Norway and quantifies the connectivity of infective pelagic lice stages among the farms with the ocean currents. We show that although the complex geography of western Norwegian fjords governs the long-term topology of the connectivity network, there was a strong seasonal component to network fragmentation. The main de-structuring agent was the delayed infectivity of the pelagic lice stages at cooler temperatures increasing dispersal distances, enhanced by occasional large scale wind forcing events. Coordinated fallowing strategies and de-lousing treatments only played a marginal role in network fragmentation, suggesting that novel lice restraining strategies that consider the environmentally sensitive transport distances must be developed to successfully break up the connectivity network. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway ICES Journal of Marine Science 79 4 1075 1082 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Chronically high infestation of salmon louse (Lepeophtheirus salmonis) questions the sustainability of the Norwegian Atlantic salmon (Salmo salar) aquaculture industry. The confinement of millions of hosts, within hundreds of farms with overlapping larval dispersal kernels create the structure for extremely persistent parasite meta-populations. However, the processes regulating the temporal variation in cross-contamination of pelagic salmon louse stages among farms (i.e. connectivity), a vital process driving louse population dynamics, are not well described. Here, we employ a data driven biophysical dispersal model that reproduces three-and-a-half years of production histories of 132 salmon farms in western Norway and quantifies the connectivity of infective pelagic lice stages among the farms with the ocean currents. We show that although the complex geography of western Norwegian fjords governs the long-term topology of the connectivity network, there was a strong seasonal component to network fragmentation. The main de-structuring agent was the delayed infectivity of the pelagic lice stages at cooler temperatures increasing dispersal distances, enhanced by occasional large scale wind forcing events. Coordinated fallowing strategies and de-lousing treatments only played a marginal role in network fragmentation, suggesting that novel lice restraining strategies that consider the environmentally sensitive transport distances must be developed to successfully break up the connectivity network. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Huserbråten, Mats Brockstedt Olsen Johnsen, Ingrid Askeland |
spellingShingle |
Huserbråten, Mats Brockstedt Olsen Johnsen, Ingrid Askeland Seasonal temperature regulates network connectivity of salmon louse |
author_facet |
Huserbråten, Mats Brockstedt Olsen Johnsen, Ingrid Askeland |
author_sort |
Huserbråten, Mats Brockstedt Olsen |
title |
Seasonal temperature regulates network connectivity of salmon louse |
title_short |
Seasonal temperature regulates network connectivity of salmon louse |
title_full |
Seasonal temperature regulates network connectivity of salmon louse |
title_fullStr |
Seasonal temperature regulates network connectivity of salmon louse |
title_full_unstemmed |
Seasonal temperature regulates network connectivity of salmon louse |
title_sort |
seasonal temperature regulates network connectivity of salmon louse |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3022151 https://doi.org/10.1093/icesjms/fsac024 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
1075-1082 79 ICES Journal of Marine Science 4 |
op_relation |
ICES Journal of Marine Science. 2022, 79 (4), 1075-1082. urn:issn:1054-3139 https://hdl.handle.net/11250/3022151 https://doi.org/10.1093/icesjms/fsac024 cristin:2055218 |
op_doi |
https://doi.org/10.1093/icesjms/fsac024 |
container_title |
ICES Journal of Marine Science |
container_volume |
79 |
container_issue |
4 |
container_start_page |
1075 |
op_container_end_page |
1082 |
_version_ |
1766362970455015424 |