The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake
International audience The European catfish (Silurus glanis) recently colonised large peri-alpine lakes where its exploitation of the different lake habitats (i.e. littoral, pelagic and deep benthic) may be supported by interindividual trophic variations fostering its establishment. We investigated...
Published in: | Ecology of Freshwater Fish |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.inrae.fr/hal-03750360 https://doi.org/10.1111/eff.12659 |
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ftunivsavoie:oai:HAL:hal-03750360v1 2024-04-14T08:10:00+00:00 The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake Vagnon, Chloé Bazin, Simon Cattanéo, Franck Goulon, Chloé Guillard, Jean Frossard, Victor Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Haute Ecole Spécialisée de Suisse Occidentale (HES-SO) Region Auvergne-Rhone-Alpes 2022 https://hal.inrae.fr/hal-03750360 https://doi.org/10.1111/eff.12659 en eng HAL CCSD Consejo Superior de Investigaciones Científicas info:eu-repo/semantics/altIdentifier/doi/10.1111/eff.12659 hal-03750360 https://hal.inrae.fr/hal-03750360 doi:10.1111/eff.12659 WOS: 000787580000001 http://creativecommons.org/licenses/by/ ISSN: 0906-6691 EISSN: 1600-0633 Ecology of Freshwater Fish https://hal.inrae.fr/hal-03750360 Ecology of Freshwater Fish, 2022, ⟨10.1111/eff.12659⟩ individual specialisation invasive species ontogeny stable isotopes stomach contents [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2022 ftunivsavoie https://doi.org/10.1111/eff.12659 2024-03-21T16:56:03Z International audience The European catfish (Silurus glanis) recently colonised large peri-alpine lakes where its exploitation of the different lake habitats (i.e. littoral, pelagic and deep benthic) may be supported by interindividual trophic variations fostering its establishment. We investigated the prey and lake habitats supporting S. glanis diet in the largest French peri-alpine lake (Lake Bourget) based on the contents of 231 stomachs combined with 217 individual stable isotope measurements (delta C-13 and delta N-15). The interindividual diet variations in stomachs and isotopes were quantified to identify individual specialisation within the population. The effects of body size on trophic characteristics were also explored. For most individuals, a major reliance on littoral resources was determined based on both stomach contents (86% of prey items) and stable isotopes using Bayesian mixing models (BMMs; 70.3 +/- 9.6% contributions of the littoral resources). However, pelagic and deep benthic prey (e.g. whitefish and burbot) were also identified, and BMMs indicated significant contributions of pelagic and deep benthic resources to S. glanis diets (15.8 +/- 5.3% and 13.9 +/- 5.2% respectively). Interindividual variations based on stomach contents were much higher than those estimated from stable isotopes, supporting an opportunistic trophic behaviour; although the population strongly relied on crayfish, perch and roach. Body size explained a minor fraction of S. glanis trophic characteristics, suggesting that ontogeny does not strongly structure the current population diet. Our results underscore the feeding plasticity of S. glanis, revealing that besides the littoral habitat, this invader exploits resources from all habitats in large peri-alpine lakes (deep benthic and pelagic). Therefore, its establishment in these ecosystems may represent a growing threat to resident species, especially if the population and individual body size increase in the near future. Article in Journal/Newspaper Burbot Université Savoie Mont Blanc: HAL Alpine Lake ENVELOPE(-129.182,-129.182,55.529,55.529) Ecology of Freshwater Fish |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
individual specialisation invasive species ontogeny stable isotopes stomach contents [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
individual specialisation invasive species ontogeny stable isotopes stomach contents [SDE.BE]Environmental Sciences/Biodiversity and Ecology Vagnon, Chloé Bazin, Simon Cattanéo, Franck Goulon, Chloé Guillard, Jean Frossard, Victor The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
topic_facet |
individual specialisation invasive species ontogeny stable isotopes stomach contents [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience The European catfish (Silurus glanis) recently colonised large peri-alpine lakes where its exploitation of the different lake habitats (i.e. littoral, pelagic and deep benthic) may be supported by interindividual trophic variations fostering its establishment. We investigated the prey and lake habitats supporting S. glanis diet in the largest French peri-alpine lake (Lake Bourget) based on the contents of 231 stomachs combined with 217 individual stable isotope measurements (delta C-13 and delta N-15). The interindividual diet variations in stomachs and isotopes were quantified to identify individual specialisation within the population. The effects of body size on trophic characteristics were also explored. For most individuals, a major reliance on littoral resources was determined based on both stomach contents (86% of prey items) and stable isotopes using Bayesian mixing models (BMMs; 70.3 +/- 9.6% contributions of the littoral resources). However, pelagic and deep benthic prey (e.g. whitefish and burbot) were also identified, and BMMs indicated significant contributions of pelagic and deep benthic resources to S. glanis diets (15.8 +/- 5.3% and 13.9 +/- 5.2% respectively). Interindividual variations based on stomach contents were much higher than those estimated from stable isotopes, supporting an opportunistic trophic behaviour; although the population strongly relied on crayfish, perch and roach. Body size explained a minor fraction of S. glanis trophic characteristics, suggesting that ontogeny does not strongly structure the current population diet. Our results underscore the feeding plasticity of S. glanis, revealing that besides the littoral habitat, this invader exploits resources from all habitats in large peri-alpine lakes (deep benthic and pelagic). Therefore, its establishment in these ecosystems may represent a growing threat to resident species, especially if the population and individual body size increase in the near future. |
author2 |
Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Haute Ecole Spécialisée de Suisse Occidentale (HES-SO) Region Auvergne-Rhone-Alpes |
format |
Article in Journal/Newspaper |
author |
Vagnon, Chloé Bazin, Simon Cattanéo, Franck Goulon, Chloé Guillard, Jean Frossard, Victor |
author_facet |
Vagnon, Chloé Bazin, Simon Cattanéo, Franck Goulon, Chloé Guillard, Jean Frossard, Victor |
author_sort |
Vagnon, Chloé |
title |
The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
title_short |
The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
title_full |
The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
title_fullStr |
The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
title_full_unstemmed |
The opportunistic trophic behaviour of the European catfish ( Silurus glanis ) in a recently colonised large peri‐alpine lake |
title_sort |
opportunistic trophic behaviour of the european catfish ( silurus glanis ) in a recently colonised large peri‐alpine lake |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.inrae.fr/hal-03750360 https://doi.org/10.1111/eff.12659 |
long_lat |
ENVELOPE(-129.182,-129.182,55.529,55.529) |
geographic |
Alpine Lake |
geographic_facet |
Alpine Lake |
genre |
Burbot |
genre_facet |
Burbot |
op_source |
ISSN: 0906-6691 EISSN: 1600-0633 Ecology of Freshwater Fish https://hal.inrae.fr/hal-03750360 Ecology of Freshwater Fish, 2022, ⟨10.1111/eff.12659⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/eff.12659 hal-03750360 https://hal.inrae.fr/hal-03750360 doi:10.1111/eff.12659 WOS: 000787580000001 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1111/eff.12659 |
container_title |
Ecology of Freshwater Fish |
_version_ |
1796307493465358336 |