Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river
International audience 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 inser...
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ftccsdartic:oai:HAL:hal-02608555v1 2023-05-15T15:32:41+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, Christian RiverLy (UR Riverly) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) Centre National de la Recherche Scientifique (CNRS) 2019 https://hal.inrae.fr/hal-02608555 https://doi.org/10.1111/eff.12432 en eng HAL CCSD Consejo Superior de Investigaciones Científicas info:eu-repo/semantics/altIdentifier/doi/10.1111/eff.12432 hal-02608555 https://hal.inrae.fr/hal-02608555 doi:10.1111/eff.12432 IRSTEA: PUB00060003 WOS: 000453609900008 ISSN: 0906-6691 EISSN: 1600-0633 Ecology of Freshwater Fish https://hal.inrae.fr/hal-02608555 Ecology of Freshwater Fish, Consejo Superior de Investigaciones Científicas, 2019, 28 (1), pp.69-84. ⟨10.1111/eff.12432⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1111/eff.12432 2021-09-11T23:45:49Z International audience 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Ecology of Freshwater Fish 28 1 69 84 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Floury, M. Colombet, J. Desvilettes, Christian Interspecific competition between restocked 0+ salmon parr (Salmo salar) and native fish species in a large European river |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience 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 |
RiverLy (UR Riverly) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Floury, M. Colombet, J. Desvilettes, Christian |
author_facet |
Floury, M. Colombet, J. Desvilettes, Christian |
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 |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.inrae.fr/hal-02608555 https://doi.org/10.1111/eff.12432 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
ISSN: 0906-6691 EISSN: 1600-0633 Ecology of Freshwater Fish https://hal.inrae.fr/hal-02608555 Ecology of Freshwater Fish, Consejo Superior de Investigaciones Científicas, 2019, 28 (1), pp.69-84. ⟨10.1111/eff.12432⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/eff.12432 hal-02608555 https://hal.inrae.fr/hal-02608555 doi:10.1111/eff.12432 IRSTEA: PUB00060003 WOS: 000453609900008 |
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_ |
1766363181903511552 |