Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river
International audience In the European eel (Anguilla anguilla, L.), the steep decline of reproductive silver eels is partly due to disorientation and mortality during their downstream migration, when facing turbines, but also reservoirs and dams. In the Frémur, an obstructed river in Brittany, which...
Published in: | Environmental Biology of Fishes |
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Online Access: | https://univ-perp.hal.science/hal-01358641 https://doi.org/10.1007/s10641-016-0522-9 |
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ftunivantilles:oai:HAL:hal-01358641v1 2024-04-14T08:01:00+00:00 Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river Besson, Marc L. Trancart, Thomas Acou, Anthony Charrier, Fabien Mazel, Virgile Legault, Antoine Feunteun, Eric École normale supérieure de Lyon (ENS de Lyon) Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Fish Pass 2016 https://univ-perp.hal.science/hal-01358641 https://doi.org/10.1007/s10641-016-0522-9 en eng HAL CCSD Springer info:eu-repo/semantics/altIdentifier/doi/10.1007/s10641-016-0522-9 hal-01358641 https://univ-perp.hal.science/hal-01358641 doi:10.1007/s10641-016-0522-9 ISSN: 0378-1909 EISSN: 1573-5133 Environmental Biology of Fishes https://univ-perp.hal.science/hal-01358641 Environmental Biology of Fishes, 2016, pp.1-13. ⟨10.1007/s10641-016-0522-9⟩ Migration delay Acoustic telemetry Fragmented river Dam European eel [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/article Journal articles 2016 ftunivantilles https://doi.org/10.1007/s10641-016-0522-9 2024-03-21T17:56:52Z International audience In the European eel (Anguilla anguilla, L.), the steep decline of reproductive silver eels is partly due to disorientation and mortality during their downstream migration, when facing turbines, but also reservoirs and dams. In the Frémur, an obstructed river in Brittany, which is representative of the western coastal hydrosystem of France, five hydrophones were used to study the downstream migration patterns of twenty acoustically-tagged silver eels. Using this acoustic telemetry design, we showed that, despite exceptionally favourable environmental conditions, silver eels experienced important issues to move downstream the river. Indeed, 75 % of eels were delayed and up to 65 % were definitively stopped in their downstream migration. The 14 m high Bois-Joli dam, located at 5 km from the estuary, and its reservoir were the major obstacles to downstream movements. Eels that managed to move downstream only passed over the dam crest, during the night, and under highly favourable environmental conditions: river flow >1.2 m3.s−1 and water level at the dam >28.26 mNGF (Niveau Général de la France; baseline mean sea level for France). Three different downstream migration behaviours were observed: “successful migrants”, “uncertain migrants” and “unsuccessful migrants”. None of them were related to biological traits, suggesting a behavioural plasticity of silver eels. This study provides useful information to manage eel populations in such water basins that are very likely to be applied to all water reservoirs and dams, which are widespread through the distribution range of European eels. Article in Journal/Newspaper Anguilla anguilla Université des Antilles (UAG): HAL Joli ENVELOPE(140.015,140.015,-66.663,-66.663) Environmental Biology of Fishes 99 10 779 791 |
institution |
Open Polar |
collection |
Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
Migration delay Acoustic telemetry Fragmented river Dam European eel [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
Migration delay Acoustic telemetry Fragmented river Dam European eel [SDV.EE]Life Sciences [q-bio]/Ecology environment Besson, Marc L. Trancart, Thomas Acou, Anthony Charrier, Fabien Mazel, Virgile Legault, Antoine Feunteun, Eric Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
topic_facet |
Migration delay Acoustic telemetry Fragmented river Dam European eel [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
International audience In the European eel (Anguilla anguilla, L.), the steep decline of reproductive silver eels is partly due to disorientation and mortality during their downstream migration, when facing turbines, but also reservoirs and dams. In the Frémur, an obstructed river in Brittany, which is representative of the western coastal hydrosystem of France, five hydrophones were used to study the downstream migration patterns of twenty acoustically-tagged silver eels. Using this acoustic telemetry design, we showed that, despite exceptionally favourable environmental conditions, silver eels experienced important issues to move downstream the river. Indeed, 75 % of eels were delayed and up to 65 % were definitively stopped in their downstream migration. The 14 m high Bois-Joli dam, located at 5 km from the estuary, and its reservoir were the major obstacles to downstream movements. Eels that managed to move downstream only passed over the dam crest, during the night, and under highly favourable environmental conditions: river flow >1.2 m3.s−1 and water level at the dam >28.26 mNGF (Niveau Général de la France; baseline mean sea level for France). Three different downstream migration behaviours were observed: “successful migrants”, “uncertain migrants” and “unsuccessful migrants”. None of them were related to biological traits, suggesting a behavioural plasticity of silver eels. This study provides useful information to manage eel populations in such water basins that are very likely to be applied to all water reservoirs and dams, which are widespread through the distribution range of European eels. |
author2 |
École normale supérieure de Lyon (ENS de Lyon) Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Fish Pass |
format |
Article in Journal/Newspaper |
author |
Besson, Marc L. Trancart, Thomas Acou, Anthony Charrier, Fabien Mazel, Virgile Legault, Antoine Feunteun, Eric |
author_facet |
Besson, Marc L. Trancart, Thomas Acou, Anthony Charrier, Fabien Mazel, Virgile Legault, Antoine Feunteun, Eric |
author_sort |
Besson, Marc L. |
title |
Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
title_short |
Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
title_full |
Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
title_fullStr |
Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
title_full_unstemmed |
Disrupted downstream migration behaviour of European silver eels (Anguilla anguilla, L.) in an obstructed river |
title_sort |
disrupted downstream migration behaviour of european silver eels (anguilla anguilla, l.) in an obstructed river |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://univ-perp.hal.science/hal-01358641 https://doi.org/10.1007/s10641-016-0522-9 |
long_lat |
ENVELOPE(140.015,140.015,-66.663,-66.663) |
geographic |
Joli |
geographic_facet |
Joli |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
ISSN: 0378-1909 EISSN: 1573-5133 Environmental Biology of Fishes https://univ-perp.hal.science/hal-01358641 Environmental Biology of Fishes, 2016, pp.1-13. ⟨10.1007/s10641-016-0522-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10641-016-0522-9 hal-01358641 https://univ-perp.hal.science/hal-01358641 doi:10.1007/s10641-016-0522-9 |
op_doi |
https://doi.org/10.1007/s10641-016-0522-9 |
container_title |
Environmental Biology of Fishes |
container_volume |
99 |
container_issue |
10 |
container_start_page |
779 |
op_container_end_page |
791 |
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1796306068273364992 |