The opportunistic trophic behaviour of the European catfish (Silurus glanis) in a recently colonised large peri‐alpine lake
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 habit...
Published in: | Ecology of Freshwater Fish |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://doi.org/10.1111/eff.12659 http://arodes.hes-so.ch/record/10067 |
id |
fthessoch:oai:hesso.tind.io:10067 |
---|---|
record_format |
openpolar |
spelling |
fthessoch:oai:hesso.tind.io:10067 2023-10-09T21:50:27+02:00 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 2022-04-26T08:55:09Z https://doi.org/10.1111/eff.12659 http://arodes.hes-so.ch/record/10067 eng eng doi:10.1111/eff.12659 http://arodes.hes-so.ch/record/10067 http://arodes.hes-so.ch/record/10067 Text 2022 fthessoch https://doi.org/10.1111/eff.12659 2023-09-10T23:56:33Z 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 (δ13C and δ15N). 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. Text Burbot Hes-so: ArODES Open Archive (University of Applied Sciences and Arts Western Switzerland) Alpine Lake ENVELOPE(-129.182,-129.182,55.529,55.529) Ecology of Freshwater Fish |
institution |
Open Polar |
collection |
Hes-so: ArODES Open Archive (University of Applied Sciences and Arts Western Switzerland) |
op_collection_id |
fthessoch |
language |
English |
description |
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 (δ13C and δ15N). 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. |
format |
Text |
author |
Vagnon, Chloé Bazin, Simon Cattanéo, Franck Goulon, Chloé Guillard, Jean Frossard, Victor |
spellingShingle |
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 |
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 |
publishDate |
2022 |
url |
https://doi.org/10.1111/eff.12659 http://arodes.hes-so.ch/record/10067 |
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 |
http://arodes.hes-so.ch/record/10067 |
op_relation |
doi:10.1111/eff.12659 http://arodes.hes-so.ch/record/10067 |
op_doi |
https://doi.org/10.1111/eff.12659 |
container_title |
Ecology of Freshwater Fish |
_version_ |
1779313510648381440 |