Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river
Atlantic salmon populations have experienced strong declines in most large European rivers. In the Loire Basin, France, a major restocking effort has been carried out on the Allier River to reduce the wild population decline. This study aimed at investigating the trophic insertion of hatchery-reared...
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Language: | English |
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ftcemoa:oai:irsteadoc.irstea.fr:PUB00060003 2023-05-15T15:32:42+02:00 Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river Floury, M. Colombet, J. Desvilettes, C IRSTEA LYON UR RIVERLY FRA UNIVERSITE CLERMONT AUVERGNE CNRS UMR 6023 LMGE CLERMONT FERRAND FRA 2019 application/pdf https://irsteadoc.irstea.fr/cemoa/PUB00060003 Anglais eng http://dx.doi.org/10.1111/eff.12432 https://irsteadoc.irstea.fr/cemoa/PUB00060003 Date de dépôt: 2019-01-28 - Tous les documents et informations contenus dans la base CemOA Publications sont protégés en vertu du droit de propriété intellectuelle, en particulier par le droit d'auteur. La personne consultant la base CemOA Publications peut visualiser, reproduire, ou stocker des copies des publications, à condition que l'information soit seulement pour son usage personnel et non commercial. L'utilisation des travaux universitaires est soumise à autorisation préalable de leurs auteurs. Toute information relative au signalement d'une publication contenue dans CemOA Publications doit inclure la citation bibliographique usuelle : Nom du ou des auteurs, titre et source du document, date et URL de la notice (dc_identifier). 52800 SALMO SALAR ALIMENTATION PREDATION feeding Article de revue scientifique à comité de lecture 2019 ftcemoa https://doi.org/10.1111/eff.12432 2021-06-29T12:24:24Z Atlantic salmon populations have experienced strong declines in most large European rivers. In the Loire Basin, France, a major restocking effort has been carried out on the Allier River to reduce the wild population decline. This study aimed at investigating the trophic insertion of hatchery-reared salmon parr and whether they compete for resources with native fish species. For this purpose, two riffles located in the upstream and downstream parts of the restocked area have been surveyed monthly following the initial 0+ salmon fry release. 0+ parr densities remained high upstream, with autumnal values greater than those recommended to maximise smolt production. In contrast, downstream densities declined to weak values despite a faster increase in size, probably mainly due to summer temperatures rising above the discomfort threshold. By analysing the vulnerability to predation of ingested invertebrate prey, we highlighted the role of habitat constraints in driving most of the different fish species to a likely opportunistic utilisation of available food resources. As a result, species such as stone loaches and barbel juveniles exhibited narrow trophic niches and high overlaps with 0+ parr. Nonetheless, both abundant prey resources and spatial or temporal habitat segregation have limited interspecific competition, enabling competitive coexistence of sympatric species, except for barbel juveniles in certain circumstances. Therefore, our findings suggest that future restocking programmes should carefully consider the thermal and hydraulic conditions regarding further smolt production as well as their general trophic context, according to the potential inconvenience of restocked salmon fry arrival relative to native species. Article in Journal/Newspaper Atlantic salmon Salmo salar Irstea Publications et Bases documentaires (Irstea@doc/CemOA) Ecology of Freshwater Fish 28 1 69 84 |
institution |
Open Polar |
collection |
Irstea Publications et Bases documentaires (Irstea@doc/CemOA) |
op_collection_id |
ftcemoa |
language |
English |
topic |
SALMO SALAR ALIMENTATION PREDATION feeding |
spellingShingle |
SALMO SALAR ALIMENTATION PREDATION feeding Floury, M. Colombet, J. Desvilettes, C Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
topic_facet |
SALMO SALAR ALIMENTATION PREDATION feeding |
description |
Atlantic salmon populations have experienced strong declines in most large European rivers. In the Loire Basin, France, a major restocking effort has been carried out on the Allier River to reduce the wild population decline. This study aimed at investigating the trophic insertion of hatchery-reared salmon parr and whether they compete for resources with native fish species. For this purpose, two riffles located in the upstream and downstream parts of the restocked area have been surveyed monthly following the initial 0+ salmon fry release. 0+ parr densities remained high upstream, with autumnal values greater than those recommended to maximise smolt production. In contrast, downstream densities declined to weak values despite a faster increase in size, probably mainly due to summer temperatures rising above the discomfort threshold. By analysing the vulnerability to predation of ingested invertebrate prey, we highlighted the role of habitat constraints in driving most of the different fish species to a likely opportunistic utilisation of available food resources. As a result, species such as stone loaches and barbel juveniles exhibited narrow trophic niches and high overlaps with 0+ parr. Nonetheless, both abundant prey resources and spatial or temporal habitat segregation have limited interspecific competition, enabling competitive coexistence of sympatric species, except for barbel juveniles in certain circumstances. Therefore, our findings suggest that future restocking programmes should carefully consider the thermal and hydraulic conditions regarding further smolt production as well as their general trophic context, according to the potential inconvenience of restocked salmon fry arrival relative to native species. |
author2 |
IRSTEA LYON UR RIVERLY FRA UNIVERSITE CLERMONT AUVERGNE CNRS UMR 6023 LMGE CLERMONT FERRAND FRA |
format |
Article in Journal/Newspaper |
author |
Floury, M. Colombet, J. Desvilettes, C |
author_facet |
Floury, M. Colombet, J. Desvilettes, C |
author_sort |
Floury, M. |
title |
Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
title_short |
Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
title_full |
Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
title_fullStr |
Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
title_full_unstemmed |
Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
title_sort |
interspecific competition between restocked 0+ salmon parr (salmo salar) and native fish species in a large european river |
publishDate |
2019 |
url |
https://irsteadoc.irstea.fr/cemoa/PUB00060003 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
52800 |
op_relation |
http://dx.doi.org/10.1111/eff.12432 https://irsteadoc.irstea.fr/cemoa/PUB00060003 |
op_rights |
Date de dépôt: 2019-01-28 - Tous les documents et informations contenus dans la base CemOA Publications sont protégés en vertu du droit de propriété intellectuelle, en particulier par le droit d'auteur. La personne consultant la base CemOA Publications peut visualiser, reproduire, ou stocker des copies des publications, à condition que l'information soit seulement pour son usage personnel et non commercial. L'utilisation des travaux universitaires est soumise à autorisation préalable de leurs auteurs. Toute information relative au signalement d'une publication contenue dans CemOA Publications doit inclure la citation bibliographique usuelle : Nom du ou des auteurs, titre et source du document, date et URL de la notice (dc_identifier). |
op_doi |
https://doi.org/10.1111/eff.12432 |
container_title |
Ecology of Freshwater Fish |
container_volume |
28 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
84 |
_version_ |
1766363198584258560 |