Riga Hydropower Station Reservoir

The Reservoir of Riga Hydropower Station on the Daugava River was formed in 1970. The investigation of long-term processes in river/reservoir communities was carried out since 1976.

Active sedimentation and accumulation is still ongoing in Riga Reservoir. The decrease of water temperature and dissolved oxygen in the ­Reservoir with increasing depth is observed, as well as an increase in phosphates. There is an increase of phytoplankton biomasses and cyanobacteria blooms. The change in dominant taxa from the river nerite Theodoxus ­fluviatilis and freshwater limpet Ancylus fluviatilis to oligochaetes.