Dietary breadth and trophic position of introduced European catfish Silurus glanis in the River Tarn (Garonne River basin), southwest France

Syväranta, Jari; Cucherousset, Julien; Kopp, Dorothée; Crivellì, Alain J.; Céréghino, Régis; Santoul, Frédéric

doi:10.3354/ab00220

Cited by 54 publications

(74 citation statements)

References 30 publications

(42 reference statements)

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“…However, in the Ebro River, only S. glanis (trophic levels of 4.3-4.7) (Encina and Granado-Lorencio, 1991), a predator at the top of the food chain in that ecosystem, showed detectable UV-F concentrations. In Guadalquivir River, EHMC accumulation was also most pronounced in L. sclateri (trophic level of 2.64) (Syvaranta et al, 2010) than in C. carpio (trophic level of 2.79) (Yu et al, 2012). In a previous study, Fent et al suggested that biomagnification occurs for this compound in the aquatic environment (Fent et al, 2010).…”

Section: Fish Species Distributionmentioning

confidence: 92%

UV filters bioaccumulation in fish from Iberian river basins

Gago-Ferrero

Díaz-Cruz

Barceló

2015

Science of The Total Environment

159

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The occurrence of eight organic UV filters (UV-Fs) was assessed in fish from four Iberian river basins. This group of compounds is extensively used in cosmetic products and other industrial goods to avoid the damaging effects of UV radiation, and has been found to be ubiquitous contaminants in the aquatic ecosystem. In particular, fish are considered by the scientific community to be the most feasible organism for contamination monitoring in aquatic ecosystems. Despite that, studies on the bioaccumulation of UV-F are scarce. In this study fish samples from four Iberian river basins under high anthropogenic pressure were analysed by liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Benzophenone-3 (BP3), ethylhexyl methoxycinnamate (EHMC), 4-methylbenzylidene camphor (4MBC) and octocrylene (OC) were the predominant pollutants in the fish samples, with concentrations in the range of ng/g dry weight (d.w.). The results indicated that most polluted area corresponded to Guadalquivir River basin, where maximum concentrations were found for EHMC (241.7 ng/gd.w.). Sediments from this river basin were also analysed. Lower values were observed in relation to fish for OC and EHMC, ranging from below the limits of detection to 23 ng/gd.w. Accumulation levels of UV-F in the fish were used to calculate biota-sediment accumulation factors (BSAFs). These values were always below 1, in the range of 0.04-0.3, indicating that the target UV-Fs are excreted by fish only to some extent. The fact that the highest concentrations were determined in predators suggests that biomagnification of UV-F may take place along the freshwater food web.

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Section: Fish Species Distributionmentioning

confidence: 92%

UV filters bioaccumulation in fish from Iberian river basins

Gago-Ferrero

Díaz-Cruz

Barceló

2015

Science of The Total Environment

159

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“…We conducted the present study in the Tarn River (Southwestern France) within the historical city center of Albi, a UNESCO World Heritage Centre. European catfish were introduced in the Tarn River in 1983 and have since established self-sustained populations [12]. Behavioral monitoring was performed from a bridge above a gravel island where pigeons ( Columbia livia Gmelin) regroup for drinking and cleaning (43° 55′ 51.77″ N, 2° 08′ 41.83″ E).…”

Section: Methodsmentioning

confidence: 99%

“…Fin clips were collected by angling from 5 individuals while muscle samples were collected on the flank of 9 additional individuals by scuba divers using a spear gun equipped with a 40-mm length and 27-mm diameter stainless steel biopsy tip. Fin and muscle samples were pooled in the analyses since their stable isotope values do not differ significantly in this species [12]. No lipid correction was performed since samples have low and homogeneous C:N ratios (3.2±0.2 SD) [18].…”

Section: Methodsmentioning

confidence: 99%

“Freshwater Killer Whales”: Beaching Behavior of an Alien Fish to Hunt Land Birds

et al. 2012

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The behavioral strategies developed by predators to capture and kill their prey are fascinating, notably for predators that forage for prey at, or beyond, the boundaries of their ecosystem. We report here the occurrence of a beaching behavior used by an alien and large-bodied freshwater predatory fish (Silurus glanis) to capture birds on land (i.e. pigeons, Columbia livia). Among a total of 45 beaching behaviors observed and filmed, 28% were successful in bird capture. Stable isotope analyses (δ13C and δ15N) of predators and their putative prey revealed a highly variable dietary contribution of land birds among individuals. Since this extreme behavior has not been reported in the native range of the species, our results suggest that some individuals in introduced predator populations may adapt their behavior to forage on novel prey in new environments, leading to behavioral and trophic specialization to actively cross the water-land interface.

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“…The mass of prey was deduced from the average daily ration ( DR ) of Wels catfish of size ranges 51–70 cm, 71–100 cm and 40–160 cm from June, July, August and September (reviewed in [15]). Two diet compositions were simulated, i.e.…”

Section: Methodsmentioning

confidence: 99%

Colossal Aggregations of Giant Alien Freshwater Fish as a Potential Biogeochemical Hotspot

et al. 2011

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The ubiquity and fascinating nature of animal aggregations are widely recognised. We report here consistent and previously undocumented occurences of aggregations of a giant alien freshwater fish, the Wels catfish (Silurus glanis). Aggregative groups were on average composed of 25 (±10 SD, ranging from 15 to 44) adults with estimated average total biomass of 651 kg (386 – 1132) and biomass density of 23 kg m−2 (14 – 40). Aggregations always occurred within the same location. No foraging, reproductive or anti-predator behaviour were observed during the aggregations. A mass-balance model estimated that these colossal aggregations of an alien species can locally release, through excretion only, up to 70 mg P m−2 h−1 and 400 mg N m−2 h−1, potentially representing the highest biogeochemical hotspots reported in freshwater ecosystems and another unexpected ecological effect of alien species.

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Dietary breadth and trophic position of introduced European catfish Silurus glanis in the River Tarn (Garonne River basin), southwest France

Cited by 54 publications

References 30 publications

UV filters bioaccumulation in fish from Iberian river basins

UV filters bioaccumulation in fish from Iberian river basins

“Freshwater Killer Whales”: Beaching Behavior of an Alien Fish to Hunt Land Birds

Colossal Aggregations of Giant Alien Freshwater Fish as a Potential Biogeochemical Hotspot

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