INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Contribution of non-native species to fish communities in 1940 european lakes: geographical distribution, predictors of occurrence, and proportions in community abundance and biomasss
Autor/es:
THOMAS MEHNER; IGNASI ARRANZ; TERESA FERREIRA; ERIK JEPPESEN; SAMO PODGORNIK; IAN J. WINFIELD; CHRISTINE ARGILLIER; LLUÍS BENEJAM; KERSTIN HOLMGREN; TEET KRAUSE; PIETRO VOLTA; CAROLINA TROCHINE; MERYEM BEKLIOGLU; TRYGVE HESTHAGEN; FIONA KELLY; MARTTI RASK; SANDRA BRUCET
Lugar:
Torino
Reunión:
Congreso; SIL 2016; 2016
Resumen:
The invasion of non-native species is considered one of the major threats for biodiversity worldwide. Freshwater ecosystems are still relatively poorly studied in this context, and there is no systematic overview on non-native fish species in European lakes. We took advantage of the important sampling effort and data collection on fish communities following the implementation of the European Water Framework Directive, and compiled information on non-native fish species in 1940 lakes and reservoirs from 13 European countries plus Turkey. Non-native species occurred only in 297 lakes or reservoirs (15.3% of total). The highest proportions of non-natives (>80% of species richness) were found in 38 Irish lakes and 5 reservoirs of Spain and Portugal. The proportions of non-natives in overall lake species richness correlated closely with proportions of non-natives in approximations of total fish abundance and biomass. This strong correlation suggests that non-natives rarely came to community dominance in lakes, which are characterized by a high richness of native species. The dominant predictors of non-native proportions were temperature, precipitation and lake spatial dimensions (area and depth), whereas total phosphorus (TP) concentration was not a significant predictor in a subset of lakes for which TP data were available. We conclude that many European lakes are still relatively unimpacted by fish species invasions, and that the changes observed in dominance structure of fish communities after invasions are still modest.