Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river
International audience A total of 1,816 eels were sampled in 1988, from seven sampling areas. Four areas were located in brackish water and the remaining three were located in freshwater reaches of the Tagus river basin. Eels were more abundant in the middle estuary and decreased both in the upstrea...
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ftmuseumnhn:oai:HAL:hal-00186064v1 2024-04-28T07:55:11+00:00 Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river Costa, José, Lino Domingos, Isabel Assis, Carlos, A. Almeida, Pedro, R. Moreira, Francisco Feunteun, Eric Costa, Maria, José Biologie des organismes marins et écosystèmes (BOME) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.science/hal-00186064 https://doi.org/10.1007/s10641-007-9229-2 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1007/s10641-007-9229-2 hal-00186064 https://hal.science/hal-00186064 doi:10.1007/s10641-007-9229-2 Environmental Biology of Fishes https://hal.science/hal-00186064 Environmental Biology of Fishes, 2008, 81 (4), pp.421-434. ⟨10.1007/s10641-007-9229-2⟩ Tagus River Brackish and freshwater Abundance Population structure Feeding and condition Dam impacts [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/article Journal articles 2008 ftmuseumnhn https://doi.org/10.1007/s10641-007-9229-2 2024-04-04T17:31:22Z International audience A total of 1,816 eels were sampled in 1988, from seven sampling areas. Four areas were located in brackish water and the remaining three were located in freshwater reaches of the Tagus river basin. Eels were more abundant in the middle estuary and decreased both in the upstream and in the downstream directions, with a predominance of males in higher density areas. Smaller individuals preferred more peripheral areas, such as margins and upper reaches in the brackish water zone, and the tributaries of the freshwater habitats. It was assumed that this distribution pattern resulted from three main factors: (i) the dominance of larger specimens; (ii) the need to avoid predators and; (iii) the search for better trophic conditions. The condition of the individuals generally decreased toward the upper reaches, apparently due to a corresponding decrease in feeding intensity. The presence of the Belver dam in the main river, 158 km upstream from the sea, seemed to impose major alterations to the described patterns. The concentration of specimens below this impassable obstacle yielded a reduction in the proportion of females and a decrease in the condition and survival of the eels, contributing to a reduction in the spawning success of this population. Suggestions to diminish the effects of the dam, and to preserve the fishery are also presented Article in Journal/Newspaper Anguilla anguilla Muséum National d'Histoire Naturelle (MNHM): HAL Environmental Biology of Fishes 81 4 421 434 |
institution |
Open Polar |
collection |
Muséum National d'Histoire Naturelle (MNHM): HAL |
op_collection_id |
ftmuseumnhn |
language |
English |
topic |
Tagus River Brackish and freshwater Abundance Population structure Feeding and condition Dam impacts [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
Tagus River Brackish and freshwater Abundance Population structure Feeding and condition Dam impacts [SDV.EE]Life Sciences [q-bio]/Ecology environment Costa, José, Lino Domingos, Isabel Assis, Carlos, A. Almeida, Pedro, R. Moreira, Francisco Feunteun, Eric Costa, Maria, José Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
topic_facet |
Tagus River Brackish and freshwater Abundance Population structure Feeding and condition Dam impacts [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
International audience A total of 1,816 eels were sampled in 1988, from seven sampling areas. Four areas were located in brackish water and the remaining three were located in freshwater reaches of the Tagus river basin. Eels were more abundant in the middle estuary and decreased both in the upstream and in the downstream directions, with a predominance of males in higher density areas. Smaller individuals preferred more peripheral areas, such as margins and upper reaches in the brackish water zone, and the tributaries of the freshwater habitats. It was assumed that this distribution pattern resulted from three main factors: (i) the dominance of larger specimens; (ii) the need to avoid predators and; (iii) the search for better trophic conditions. The condition of the individuals generally decreased toward the upper reaches, apparently due to a corresponding decrease in feeding intensity. The presence of the Belver dam in the main river, 158 km upstream from the sea, seemed to impose major alterations to the described patterns. The concentration of specimens below this impassable obstacle yielded a reduction in the proportion of females and a decrease in the condition and survival of the eels, contributing to a reduction in the spawning success of this population. Suggestions to diminish the effects of the dam, and to preserve the fishery are also presented |
author2 |
Biologie des organismes marins et écosystèmes (BOME) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Costa, José, Lino Domingos, Isabel Assis, Carlos, A. Almeida, Pedro, R. Moreira, Francisco Feunteun, Eric Costa, Maria, José |
author_facet |
Costa, José, Lino Domingos, Isabel Assis, Carlos, A. Almeida, Pedro, R. Moreira, Francisco Feunteun, Eric Costa, Maria, José |
author_sort |
Costa, José, Lino |
title |
Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
title_short |
Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
title_full |
Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
title_fullStr |
Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
title_full_unstemmed |
Comparative ecology of the European eel, Anguilla anguilla (L. 1758), in a large Iberian river |
title_sort |
comparative ecology of the european eel, anguilla anguilla (l. 1758), in a large iberian river |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00186064 https://doi.org/10.1007/s10641-007-9229-2 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Environmental Biology of Fishes https://hal.science/hal-00186064 Environmental Biology of Fishes, 2008, 81 (4), pp.421-434. ⟨10.1007/s10641-007-9229-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10641-007-9229-2 hal-00186064 https://hal.science/hal-00186064 doi:10.1007/s10641-007-9229-2 |
op_doi |
https://doi.org/10.1007/s10641-007-9229-2 |
container_title |
Environmental Biology of Fishes |
container_volume |
81 |
container_issue |
4 |
container_start_page |
421 |
op_container_end_page |
434 |
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1797578878528520192 |