Spatio-temporal variability of diatom assemblages in surface sediments of Lake Peipsi

► We compared diatoms in samples taken from Lake Peipsi in 2006 and in the 1970s. ► Relationships between diatoms and physical environmental variables were defined. ► Main diatom taxa have not changed during more than 25 years. ► Areas with higher concentrations of diatom valves have changed. ► The study revealed the importance of local abiotic conditions for diatoms.