evaluate nutrient conditions in freshwaters based on taxonomic
changes as a measure of the impact of nutrients on ecosystems.
In Ismailia Canal, TDI represented a diverse water
quality, but the results partially correlate (Table 5) with eutrophication
parameters (EC, TDS, PO4, NH4 and NO3). Other
studies revealed that TDI does not produce truly representational
assessments of the trophic state of waters (Szczepocka
and Szulc, 2009). Rakowska and Szczepocka (2011)