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Does the non-native European catfish Silurus glanis threaten French river fish populations ?

Guillerault, Nicolas and Delmotte, Sebastien and Boulêtreau, Stéphanie and Lauzeral, Christine and Poulet, Nicolas and Santoul, Frédéric Does the non-native European catfish Silurus glanis threaten French river fish populations ? (2015) Freshwater Biology, 60 (5). 922-928. ISSN 0046-5070

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Official URL: https://doi.org/10.1111/fwb.12545

Abstract

The European catfish, Silurus glanis, was widely introduced in western Europe, and it has now established self-sustaining populations in numerous large rivers of western France. Using data collected from surveys conducted by the French National Agency for Water and Aquatic Environment (Onema) from 1989 to 2010 in more than 500 sites throughout the country (10636 electrofishing surveys), we investigated the potential impact of the European catfish on fish communities in French rivers. In the first part of the analysis, we compared trends observed before and after the European catfish was established at given sites (before-after analysis). Species richness, evenness and diversity decreased significantly after the European catfish was established at 1.4%, 1.4% and 5.8% of the sites, respectively. Total fish biomass and density decreased significantly at 6.6% and 2.9% of the sites, respectively. In the second part of the analysis, we compared sites with European catfish against sites lacking European catfish during the same period (with-without analysis). Fish species richness was significantly higher in sites with European catfish. No significant differences in fish diversity, evenness, total fish biomass or density were found between sites with or without European catfish. While our results indicate that the European catfish may in a few cases impact fish communities or populations, it does not appear to be responsible for a countrywide collapse in fish assemblages.

Item Type:Article
HAL Id:hal-01182175
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Modélisation et Analyses de Données en Environnement - MAD-Environnement (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Office national de l'eau et des milieux aquatiques - ONEMA (FRANCE)
Laboratory name:
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Deposited By: Nicolas POULET
Deposited On:27 Mar 2019 10:31

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