Rusanov and Stanislavskaya (2011)
revealed that the application of trophic diatomic indices
developed in Western and Middle Europe makes it possible
to reveal zonal variations in water quality in Ladoga basin
streams, but is not effective for the assessment of eutrophication
of streams. Belal (2012) concluded that diatom indices/
metrics developed in certain parts of Europe are not effective
when used in River Nile.