Novel large-scale mapping highlights poor state of sea trout populations
1. The state of sea trout in 1251 Norwegian watercourses was assessed based on a scoring system for human pressures, abundance data, and local knowledge. 2. Over 16,000 km of rivers and lakes were available to sea trout in these watercourses, spanning from the temperate to Arctic regions. 3. Sea tro...
Published in: | Aquatic Conservation: Marine and Freshwater Ecosystems |
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ftoslouniv:oai:www.duo.uio.no:10852/107091 2024-02-11T10:01:45+01:00 Novel large-scale mapping highlights poor state of sea trout populations ENEngelskEnglishNovel large-scale mapping highlights poor state of sea trout populations Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar 2024-01-11T15:00:37Z http://hdl.handle.net/10852/107091 https://doi.org/10.1002/aqc.4067 EN eng NFR/160022 Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar . Novel large-scale mapping highlights poor state of sea trout populations. Aquatic conservation. 2024 http://hdl.handle.net/10852/107091 2224776 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Aquatic conservation&rft.volume=&rft.spage=&rft.date=2024 Aquatic conservation https://doi.org/10.1002/aqc.4067 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 1052-7613 VDP::Zoologiske og botaniske fag: 480 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2024 ftoslouniv https://doi.org/10.1002/aqc.4067 2024-01-24T23:39:44Z 1. The state of sea trout in 1251 Norwegian watercourses was assessed based on a scoring system for human pressures, abundance data, and local knowledge. 2. Over 16,000 km of rivers and lakes were available to sea trout in these watercourses, spanning from the temperate to Arctic regions. 3. Sea trout were classified to be in a good or very good state in fewer than 25% of the watercourses and in a poor or very poor state in almost 40%. Twenty-nine watercourses had lost their sea trout populations. 4. Salmon lice from aquaculture salmon farms had by far the largest adverse effect on sea trout among the human impact factors, both in the number of watercourses (83%) and river area affected (60%), and the total effect on sea trout abundance. 5. Agriculture and hydropower production also had strong adverse impacts (35% and 19% of watercourses), but substantially lower than that caused by salmon lice. Culverts related to road crossings and other habitat alterations also had impacts on sea trout in many watercourses (27%). 6. Exploitation of sea trout has been reduced in Norway in recent years, both in the marine and freshwater fisheries. Yet, the exploitation pressure was moderate or high in almost 14% of the watercourses where the state of sea trout was poor or very poor, suggesting a high potential for overexploitation in these. 7. The state of sea trout was best in the northern sparsely populated areas. However, distribution of watercourses with sea trout in a poor or very poor state was more linked to aquaculture, agriculture, and hydropower production than human population density. 8. The developed approach for large-scale mapping of state and pressures, which is vital for prioritizing management measures, may inspire other nations in their conservation effort for this important species. acidification, anthropogenic pressures, brown trout (Salmo trutta), culverts, exploitation, hazardous substances, salmon lice (Lepeophtheirus salmonis), sewage Article in Journal/Newspaper Arctic Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Norway Aquatic Conservation: Marine and Freshwater Ecosystems 34 1 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
topic |
VDP::Zoologiske og botaniske fag: 480 |
spellingShingle |
VDP::Zoologiske og botaniske fag: 480 Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar Novel large-scale mapping highlights poor state of sea trout populations |
topic_facet |
VDP::Zoologiske og botaniske fag: 480 |
description |
1. The state of sea trout in 1251 Norwegian watercourses was assessed based on a scoring system for human pressures, abundance data, and local knowledge. 2. Over 16,000 km of rivers and lakes were available to sea trout in these watercourses, spanning from the temperate to Arctic regions. 3. Sea trout were classified to be in a good or very good state in fewer than 25% of the watercourses and in a poor or very poor state in almost 40%. Twenty-nine watercourses had lost their sea trout populations. 4. Salmon lice from aquaculture salmon farms had by far the largest adverse effect on sea trout among the human impact factors, both in the number of watercourses (83%) and river area affected (60%), and the total effect on sea trout abundance. 5. Agriculture and hydropower production also had strong adverse impacts (35% and 19% of watercourses), but substantially lower than that caused by salmon lice. Culverts related to road crossings and other habitat alterations also had impacts on sea trout in many watercourses (27%). 6. Exploitation of sea trout has been reduced in Norway in recent years, both in the marine and freshwater fisheries. Yet, the exploitation pressure was moderate or high in almost 14% of the watercourses where the state of sea trout was poor or very poor, suggesting a high potential for overexploitation in these. 7. The state of sea trout was best in the northern sparsely populated areas. However, distribution of watercourses with sea trout in a poor or very poor state was more linked to aquaculture, agriculture, and hydropower production than human population density. 8. The developed approach for large-scale mapping of state and pressures, which is vital for prioritizing management measures, may inspire other nations in their conservation effort for this important species. acidification, anthropogenic pressures, brown trout (Salmo trutta), culverts, exploitation, hazardous substances, salmon lice (Lepeophtheirus salmonis), sewage |
format |
Article in Journal/Newspaper |
author |
Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar |
author_facet |
Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar |
author_sort |
Fiske, Peder |
title |
Novel large-scale mapping highlights poor state of sea trout populations |
title_short |
Novel large-scale mapping highlights poor state of sea trout populations |
title_full |
Novel large-scale mapping highlights poor state of sea trout populations |
title_fullStr |
Novel large-scale mapping highlights poor state of sea trout populations |
title_full_unstemmed |
Novel large-scale mapping highlights poor state of sea trout populations |
title_sort |
novel large-scale mapping highlights poor state of sea trout populations |
publishDate |
2024 |
url |
http://hdl.handle.net/10852/107091 https://doi.org/10.1002/aqc.4067 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
1052-7613 |
op_relation |
NFR/160022 Fiske, Peder Forseth, Torbjørn Thorstad, Eva Bonsak Bakkestuen, Vegar Einum, Sigurd Falkegård, Morten Garmo, Øyvind A. Garseth, Åse Helen Skoglund, Helge Solberg, Monica Favnebøe Utne, Kjell Rong Vollset, Knut Vøllestad, Leif Asbjørn Wennevik, Vidar . Novel large-scale mapping highlights poor state of sea trout populations. Aquatic conservation. 2024 http://hdl.handle.net/10852/107091 2224776 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Aquatic conservation&rft.volume=&rft.spage=&rft.date=2024 Aquatic conservation https://doi.org/10.1002/aqc.4067 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/aqc.4067 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
34 |
container_issue |
1 |
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1790597549700153344 |