Jackson M. C. auteur aut IRD Britton J. R. auteur aut IRD Cucherousset J. auteur aut IRD Guo Z. auteur aut IRD Stakenas S. auteur aut IRD Gozlan Rodolphe auteur aut IRD Godard M. G. auteur aut IRD Roussel J. M. auteur aut IRD Copp G. H. auteur aut IRD text journalArticle eng text/pdf born digital access Brown trout Salmo trutta Linnaeus, 1758, is a priority species for conservation and management efforts in many European countries. In its native range, interactions with non-native fishes often adversely affect somatic growth rates and population abundances. Consequences of introduced North American pumpkinseed Lepomis gibbosus (Linnaeus, 1758) for native S. trutta were examined in stream stretches with and without L. gibbosus. Data for somatic growth rates and trophic niche breadth (using stable isotope analyses) provided little evidence of L. gibbosus presence being detrimental for S. trutta. Shifts in S. trutta diet at all sites were associated with increased piscivory with increasing body length, with no evidence to suggest that interspecific resource competition with L. gibbosus structured the food web or affected trophic positions. Three years later, and following L. gibbosus removal, data revealed slight shifts in the food web at each site, but these related to shifts in resources at the bottom of the food chain rather than a response to L. gibbosus removal. Consequently, the ecological consequences of L. gibbosus for S. trutta in the study stream were minimal, with S. trutta populations responding more to natural mechanisms regulating their populations than to the presence of this non-native fish species. specialized Stable isotope analysis Alien species Environmental impacts Introduced species Circular statistics Ecological consequences Small streams ANGLETERRE 036 020 772 1 63-75 2016 0018-8158 https://www.documentation.ird.fr/hor/fdi:010066874 10.1007/s10750-016-2641-x 0018-8158 [F B010066874] https://www.documentation.ird.fr/hor/fdi:010066874 https://www.documentation.ird.fr/intranet/publi/2016/06/010066874.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-06-29 2017-08-23 fdi:010066874 fre