The application of biotic indices by Beltrami et al.
(2007) in the Trentino streams (Northern Italy) showed that
only the TDI reveals the presence of high eutrophic impact,
while IPS and EPI-D reach the III class only for eu-polytrophic
stations, and suggested that the application of different
indices, such as saprobic and trophic ones, can give more
detailed information on the pollution sources.