Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation
International audience Freshwater reclaimed marshes along the European Atlantic coast are highly suitable for European eels (Anguilla anguilla). However, European eel stocks have declined, and the coastal marshes have been subjected to major disturbances. The objective of our study was to analyze th...
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ftunivnantes:oai:HAL:hal-00815322v1 2023-05-15T13:27:16+02:00 Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation Laffaille, Pascal Baisez, Aurore Rigaud, Christian Feunteun, Eric Biodiversité fonctionnelle et gestion des territoires Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) Fish Pass Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Université de Rennes (UNIV-RENNES) 2004-09 https://hal.archives-ouvertes.fr/hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322/document https://hal.archives-ouvertes.fr/hal-00815322/file/Laffaille_6192.pdf https://doi.org/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322/document https://hal.archives-ouvertes.fr/hal-00815322/file/Laffaille_6192.pdf doi:10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 OATAO: 6192 info:eu-repo/semantics/OpenAccess ISSN: 0277-5212 Wetlands https://hal.archives-ouvertes.fr/hal-00815322 Wetlands, Springer Verlag, 2004, Vol. 24, pp. 642-651. ⟨10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2⟩ Anguilla anguilla Reclaimed marsh Habitat Spatial organization Anthropic disturbances [SDV.BID]Life Sciences [q-bio]/Biodiversity [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems info:eu-repo/semantics/article Journal articles 2004 ftunivnantes https://doi.org/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 2022-08-09T22:55:11Z International audience Freshwater reclaimed marshes along the European Atlantic coast are highly suitable for European eels (Anguilla anguilla). However, European eel stocks have declined, and the coastal marshes have been subjected to major disturbances. The objective of our study was to analyze the processes governing patterns of European eel microhabitat distribution of four eel size classes (from ,160 mm to .360 mm) in a reclaimed marsh (France). Analyses were conducted using artificial neural network (ANN) techniques and ecological profiles. Our ANN results showed that eel densities were significantly related to three major influencing variables: the width of ditch section, the silt depth, and the density of emergent plants. Such ecological profiles were significantly different between small (,240 mm) and large eels (.360 mm): small eels were more widespread than large eels. Large eels were absent or at low densities in shallow ditches with a high aquatic plant cover obstructing the water column and a large quantity of silt. These characteristics seem to define the ditches not directly connected with the main river where dredging operations were rare. Management of regular dredging operations in the channels by maintaining a mosaic of permanent aquatic habitats and avoiding the heavy silt loads in most ditches should be promoted. This dredging operation was probably one of the most promising ways for restoring inland eel stocks. Article in Journal/Newspaper Anguilla anguilla European eel Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Anguilla anguilla Reclaimed marsh Habitat Spatial organization Anthropic disturbances [SDV.BID]Life Sciences [q-bio]/Biodiversity [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
spellingShingle |
Anguilla anguilla Reclaimed marsh Habitat Spatial organization Anthropic disturbances [SDV.BID]Life Sciences [q-bio]/Biodiversity [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems Laffaille, Pascal Baisez, Aurore Rigaud, Christian Feunteun, Eric Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
topic_facet |
Anguilla anguilla Reclaimed marsh Habitat Spatial organization Anthropic disturbances [SDV.BID]Life Sciences [q-bio]/Biodiversity [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems |
description |
International audience Freshwater reclaimed marshes along the European Atlantic coast are highly suitable for European eels (Anguilla anguilla). However, European eel stocks have declined, and the coastal marshes have been subjected to major disturbances. The objective of our study was to analyze the processes governing patterns of European eel microhabitat distribution of four eel size classes (from ,160 mm to .360 mm) in a reclaimed marsh (France). Analyses were conducted using artificial neural network (ANN) techniques and ecological profiles. Our ANN results showed that eel densities were significantly related to three major influencing variables: the width of ditch section, the silt depth, and the density of emergent plants. Such ecological profiles were significantly different between small (,240 mm) and large eels (.360 mm): small eels were more widespread than large eels. Large eels were absent or at low densities in shallow ditches with a high aquatic plant cover obstructing the water column and a large quantity of silt. These characteristics seem to define the ditches not directly connected with the main river where dredging operations were rare. Management of regular dredging operations in the channels by maintaining a mosaic of permanent aquatic habitats and avoiding the heavy silt loads in most ditches should be promoted. This dredging operation was probably one of the most promising ways for restoring inland eel stocks. |
author2 |
Biodiversité fonctionnelle et gestion des territoires Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) Fish Pass Ressources aquatiques continentales (UR RABX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Université de Rennes (UNIV-RENNES) |
format |
Article in Journal/Newspaper |
author |
Laffaille, Pascal Baisez, Aurore Rigaud, Christian Feunteun, Eric |
author_facet |
Laffaille, Pascal Baisez, Aurore Rigaud, Christian Feunteun, Eric |
author_sort |
Laffaille, Pascal |
title |
Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
title_short |
Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
title_full |
Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
title_fullStr |
Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
title_full_unstemmed |
Habitat preferences of different European eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
title_sort |
habitat preferences of different european eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.archives-ouvertes.fr/hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322/document https://hal.archives-ouvertes.fr/hal-00815322/file/Laffaille_6192.pdf https://doi.org/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
ISSN: 0277-5212 Wetlands https://hal.archives-ouvertes.fr/hal-00815322 Wetlands, Springer Verlag, 2004, Vol. 24, pp. 642-651. ⟨10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322 https://hal.archives-ouvertes.fr/hal-00815322/document https://hal.archives-ouvertes.fr/hal-00815322/file/Laffaille_6192.pdf doi:10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 OATAO: 6192 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1672/0277-5212(2004)024[0642:HPODEE]2.0.CO;2 |
_version_ |
1766397412963778560 |