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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ftccsdartic:oai:HAL:hal-02583316v1 2023-05-15T13:27:53+02:00 Habitat preferences of different european eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation Laffaille, P. Baisez, A. Rigaud, Christian Feunteun, E. Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES) Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Université de La Rochelle (ULR) 2004 https://hal.inrae.fr/hal-02583316 en eng HAL CCSD Springer Verlag hal-02583316 https://hal.inrae.fr/hal-02583316 IRSTEA: PUB00014690 ISSN: 0277-5212 Wetlands https://hal.inrae.fr/hal-02583316 Wetlands, Springer Verlag, 2004, 24 (3), pp.642-651 ATLANTIQUE MARAIS [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2004 ftccsdartic 2021-10-24T01:30:23Z 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
ATLANTIQUE MARAIS [SDE]Environmental Sciences |
spellingShingle |
ATLANTIQUE MARAIS [SDE]Environmental Sciences Laffaille, P. Baisez, A. Rigaud, Christian Feunteun, E. Habitat preferences of different european eel size classes in a reclaimed marsh: a contribution to species and ecosystem conservation |
topic_facet |
ATLANTIQUE MARAIS [SDE]Environmental Sciences |
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 |
Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES) Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) Université de La Rochelle (ULR) |
format |
Article in Journal/Newspaper |
author |
Laffaille, P. Baisez, A. Rigaud, Christian Feunteun, E. |
author_facet |
Laffaille, P. Baisez, A. Rigaud, Christian Feunteun, E. |
author_sort |
Laffaille, P. |
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.inrae.fr/hal-02583316 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
ISSN: 0277-5212 Wetlands https://hal.inrae.fr/hal-02583316 Wetlands, Springer Verlag, 2004, 24 (3), pp.642-651 |
op_relation |
hal-02583316 https://hal.inrae.fr/hal-02583316 IRSTEA: PUB00014690 |
_version_ |
1766400907985027072 |