Activity Patterns and Tridimensional Space Use of the European Catfish on a Reservoir in River Tagus (Portugal) †

Abstract

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Westwards expansion of the European catfishSilurus glanisin the Douro River (Portugal)

“…The copyright holder for this preprint this version posted January 9, 2023. ; https://doi.org/10.1101/2023.01.07.522915 doi: bioRxiv preprint shallow habitats during catfish's foraging activity (Santos 2022). This needs further analysis given our low sample size, but is consistent with previous work (Ferreira et al, 2019).…”

“…The ability of European catfish to colonise novel ecosystems seems to be driven by its wide diet plasticity and adaptability to newly available prey (Syväranta et al, 2010; Cucherousset et al, 2012). Our preliminary stomach content analysis comprised only three items (2 freshwater shrimps and 1 unidentified insect), suggesting predation close to river banks where A. desmarestii are numerous (Fidalgo & Gerhardt, 2002) and the use of shallow habitats during catfish’s foraging activity (Santos 2022). This needs further analysis given our low sample size, but is consistent with previous work (Ferreira et al, 2019).…”

Westwards expansion of the European catfish Silurus glanis in the Douro River (Portugal)

“…The ability of the European catfish to colonise novel ecosystems seems to be driven by its wide diet plasticity and adaptability to newly available prey (Syväranta et al, 2010;Cucherousset et al, 2012). Our preliminary stomach content analysis comprised only three items (2 freshwater shrimps and 1 unidentified insect), suggesting predation close to river banks where A. desmarestii are numerous (Fidalgo & Gerhardt, 2002) and the use of shallow habitats during catfish's foraging activity (Santos 2022). This needs further analysis given our low sample size, but is consistent with previous work (Ferreira et al, 2019).…”