Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★
Obstacles in rivers are considered to be one of the main threats to diadromous fish. As a result of the recent collapse of the European eel, the European Commission introduced a Regulation, requiring to reduce all sources of anthropogenic mortality, including those caused by passing through hydropow...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2017-01-01
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| Series: | Aquatic Living Resources |
| Subjects: | |
| Online Access: | https://www.alr-journal.org/articles/alr/full_html/2017/01/alr160079/alr160079.html |
| _version_ | 1797698179451322368 |
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| author | Drouineau Hilaire Bau Frédérique Alric Alain Deligne Nicolas Gomes Peggy Sagnes Pierre |
| author_facet | Drouineau Hilaire Bau Frédérique Alric Alain Deligne Nicolas Gomes Peggy Sagnes Pierre |
| author_sort | Drouineau Hilaire |
| collection | DOAJ |
| description | Obstacles in rivers are considered to be one of the main threats to diadromous fish. As a result of the recent collapse of the European eel, the European Commission introduced a Regulation, requiring to reduce all sources of anthropogenic mortality, including those caused by passing through hydropower turbines. Improving knowledge about migration triggers and processes is crucial to assess and mitigate the impact of obstacles. In our study, we tracked 97 tagged silver eels in a fragmented river situated in the Western France (the River Dronne). Using the movement ecology framework, and implementing a Bayesian state-space model, we confirmed the influence of river discharge on migration triggering and the distance travelled by fish. We also demonstrated that, in our studied area, there is a small window of opportunity for migration. Moreover, we found that obstacles have a significant impact on distance travelled. Combined with the small window, this suggests that assessment of obstacles impact on downstream migration should not be limited to quantifying mortality at hydroelectric facilities, but should also consider the delay induced by obstacles, and its effects on escapement. The study also suggests that temporary turbines shutdown may mitigate the impacts of hydropower facilities in rivers with migration process similar to those observed here. |
| first_indexed | 2024-03-12T03:50:39Z |
| format | Article |
| id | doaj.art-86579960ae1c4338b56bb410636c9e04 |
| institution | Directory Open Access Journal |
| issn | 1765-2952 |
| language | English |
| last_indexed | 2024-03-12T03:50:39Z |
| publishDate | 2017-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Aquatic Living Resources |
| spelling | doaj.art-86579960ae1c4338b56bb410636c9e042023-09-03T12:22:04ZengEDP SciencesAquatic Living Resources1765-29522017-01-0130510.1051/alr/2017003alr160079Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★Drouineau Hilaire0https://orcid.org/0000-0001-9206-0040Bau Frédérique1Alric Alain2Deligne Nicolas3Gomes Peggy4Sagnes Pierre5Irstea UR EABXIrstea UR EABXPôle Écohydraulique ONEMA-Irstea-INP, Allée du professeur Camille SoulaIrstea UR EABXPôle Écohydraulique ONEMA-Irstea-INP, Allée du professeur Camille SoulaPôle Écohydraulique ONEMA-Irstea-INP, Allée du professeur Camille SoulaObstacles in rivers are considered to be one of the main threats to diadromous fish. As a result of the recent collapse of the European eel, the European Commission introduced a Regulation, requiring to reduce all sources of anthropogenic mortality, including those caused by passing through hydropower turbines. Improving knowledge about migration triggers and processes is crucial to assess and mitigate the impact of obstacles. In our study, we tracked 97 tagged silver eels in a fragmented river situated in the Western France (the River Dronne). Using the movement ecology framework, and implementing a Bayesian state-space model, we confirmed the influence of river discharge on migration triggering and the distance travelled by fish. We also demonstrated that, in our studied area, there is a small window of opportunity for migration. Moreover, we found that obstacles have a significant impact on distance travelled. Combined with the small window, this suggests that assessment of obstacles impact on downstream migration should not be limited to quantifying mortality at hydroelectric facilities, but should also consider the delay induced by obstacles, and its effects on escapement. The study also suggests that temporary turbines shutdown may mitigate the impacts of hydropower facilities in rivers with migration process similar to those observed here.https://www.alr-journal.org/articles/alr/full_html/2017/01/alr160079/alr160079.htmlanguilla anguillasilver eelmigration delayriver fragmentationmovement ecologystate-space model |
| spellingShingle | Drouineau Hilaire Bau Frédérique Alric Alain Deligne Nicolas Gomes Peggy Sagnes Pierre Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ Aquatic Living Resources anguilla anguilla silver eel migration delay river fragmentation movement ecology state-space model |
| title | Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ |
| title_full | Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ |
| title_fullStr | Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ |
| title_full_unstemmed | Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ |
| title_short | Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration★ |
| title_sort | silver eel downstream migration in fragmented rivers use of a bayesian model to track movements triggering and duration★ |
| topic | anguilla anguilla silver eel migration delay river fragmentation movement ecology state-space model |
| url | https://www.alr-journal.org/articles/alr/full_html/2017/01/alr160079/alr160079.html |
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