Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming
Abstract The prevalence and abundance (density 100 m −2 ) of European eel ( Anguilla anguilla ) were studied by means of electrofishing in 13 acidified rivers in Norway that had been limed to restore acceptable water quality for Atlantic salmon ( Salmo salar ). Status of Atlantic salmon in these riv...
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crwiley:10.1111/eff.12170 2024-06-02T07:55:10+00:00 Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming Larsen, Bjørn M. Hesthagen, Trygve Thorstad, Eva B. Diserud, Ola H. Directorate for Nature Management Norwegian Water Resources and Energy Directorate Norwegian Institute for Nature Research (NINA) 2014 http://dx.doi.org/10.1111/eff.12170 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12170 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12170 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology of Freshwater Fish volume 24, issue 4, page 575-583 ISSN 0906-6691 1600-0633 journal-article 2014 crwiley https://doi.org/10.1111/eff.12170 2024-05-03T10:45:22Z Abstract The prevalence and abundance (density 100 m −2 ) of European eel ( Anguilla anguilla ) were studied by means of electrofishing in 13 acidified rivers in Norway that had been limed to restore acceptable water quality for Atlantic salmon ( Salmo salar ). Status of Atlantic salmon in these rivers varied prior to liming, from being entirely lost in six highly acidified rivers and in different stages of decline in seven less acidified rivers. Four of the rivers are heavily affected by hydropower development. The abundance and prevalence of European eel increased significantly during the study period. The best model for predicting eel abundance was that with four explanatory variables: time after liming, time after liming squared, status of salmon stocks and hydropower regulation. The eel density was expected to increase by a factor of almost 5 after 10 years of liming. The model also predicts that a river with a formerly reduced Atlantic salmon stock has a 2.8 times higher density of eel than rivers with formerly lost salmon stocks. Before liming, European eel were on average recorded at 15 and 41% of the sampling stations in rivers with formerly lost and reduced Atlantic salmon populations, respectively, increasing to 49 and 68% in individual rivers, respectively, after 10 years of liming. The recovery of European eel in these formerly acidified rivers by means of liming took place during the same period as their abundance declined in other parts of their distribution area in Norway and elsewhere in Europe. Article in Journal/Newspaper Anguilla anguilla Atlantic salmon Salmo salar Wiley Online Library Norway Ecology of Freshwater Fish 24 4 575 583 |
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Wiley Online Library |
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language |
English |
description |
Abstract The prevalence and abundance (density 100 m −2 ) of European eel ( Anguilla anguilla ) were studied by means of electrofishing in 13 acidified rivers in Norway that had been limed to restore acceptable water quality for Atlantic salmon ( Salmo salar ). Status of Atlantic salmon in these rivers varied prior to liming, from being entirely lost in six highly acidified rivers and in different stages of decline in seven less acidified rivers. Four of the rivers are heavily affected by hydropower development. The abundance and prevalence of European eel increased significantly during the study period. The best model for predicting eel abundance was that with four explanatory variables: time after liming, time after liming squared, status of salmon stocks and hydropower regulation. The eel density was expected to increase by a factor of almost 5 after 10 years of liming. The model also predicts that a river with a formerly reduced Atlantic salmon stock has a 2.8 times higher density of eel than rivers with formerly lost salmon stocks. Before liming, European eel were on average recorded at 15 and 41% of the sampling stations in rivers with formerly lost and reduced Atlantic salmon populations, respectively, increasing to 49 and 68% in individual rivers, respectively, after 10 years of liming. The recovery of European eel in these formerly acidified rivers by means of liming took place during the same period as their abundance declined in other parts of their distribution area in Norway and elsewhere in Europe. |
author2 |
Directorate for Nature Management Norwegian Water Resources and Energy Directorate Norwegian Institute for Nature Research (NINA) |
format |
Article in Journal/Newspaper |
author |
Larsen, Bjørn M. Hesthagen, Trygve Thorstad, Eva B. Diserud, Ola H. |
spellingShingle |
Larsen, Bjørn M. Hesthagen, Trygve Thorstad, Eva B. Diserud, Ola H. Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
author_facet |
Larsen, Bjørn M. Hesthagen, Trygve Thorstad, Eva B. Diserud, Ola H. |
author_sort |
Larsen, Bjørn M. |
title |
Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
title_short |
Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
title_full |
Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
title_fullStr |
Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
title_full_unstemmed |
Increased abundance of European eel ( Anguilla anguilla) in acidified Norwegian rivers after liming |
title_sort |
increased abundance of european eel ( anguilla anguilla) in acidified norwegian rivers after liming |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/eff.12170 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Feff.12170 https://onlinelibrary.wiley.com/doi/pdf/10.1111/eff.12170 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Anguilla anguilla Atlantic salmon Salmo salar |
genre_facet |
Anguilla anguilla Atlantic salmon Salmo salar |
op_source |
Ecology of Freshwater Fish volume 24, issue 4, page 575-583 ISSN 0906-6691 1600-0633 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/eff.12170 |
container_title |
Ecology of Freshwater Fish |
container_volume |
24 |
container_issue |
4 |
container_start_page |
575 |
op_container_end_page |
583 |
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1800746344794554368 |