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Dietary breadth and trophic position of introduced European catfish Silurus glanis in the Tarn River (Garonne River basin), southwest France ArchiMer
Syvaeranta, Jari; Cucherousset, Julien; Kopp, Dorothee; Crivelli, Alain; Cereghino, Regis; Santoul, Frederic.
Although being a widely introduced and successfully established species, the European catfish Silurus glanis L. (the world’s third largest freshwater fish) remains poorly studied in its introduced areas. Here we studied the trophic ecology of non-native European catfish in a large river system in south-western France using stomach content and stable isotope analyses (SIA). We used fin samples for SIA of catfish and hence tested the validity of using fin tissue as a proxy for muscle in SIA. The mean δ15N and δ13C values analysed from fin tissues did not differ from those analysed from muscle tissue and reflected strong and consistent relationships (r2 = 0.95 for carbon and r2 = 0.98 for nitrogen). The δ15N values varied almost 5‰ among the analysed catfish...
Tipo: Text Palavras-chave: Stable isotopes; Introduced species; Top predator; River; Food web; Fin clips.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00168/27896/26159.pdf
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