Rakowska and Szczepocka (2011) applied
three diatom indices (IPS, GDI and TDI) in the assessment
of water quality of Bzura River (Central Poland). They
reported that TDI raised most doubts, mainly because it does
not take into account centric diatoms, which in the Bzura are
dominants, it may perhaps perform well in rivers of low species
richness of the Centrales.