Source: Reference for the data extraction - full references are given in Appendix S1 SOM The local communities in which the 32 studies species were found in their native and introduced ranges were identified by an unique ID (Community_ID) Community_ID: ID of the community Latitude; Longitude: coordinates of the local community SR: species richness SEAc.comm: Standard Ellipse Area corrected for small sample size of the whole community calculated based on the species mean positions within the stable isotopes biplots Stable isotopes ratios were collected for the 32 studied species (Latin_name; Family) in several populations within their native and introduced ranges (Status; Time(year)). Status: Native or Non_native at the country or basin scale Time(year): Time since introduction in years Species mean positions within the d13C and d15N stable isotopes biplots are expressed as vectors according to the community centroid (Dist_cent; Angle_cent) and population niche breadth as the Standard Ellipse Area corrected for small sample size (SEAc.pop) based on the standard deviations of the population mean values along the two isotopic axes. Dist_cent: Distance to the community centroid Angle_cent: Angle to the community centroid SEAc.pop: SEAc of the population N.ind: Number of individuals