Spatial and temporal (1963-2012) variability of ichthyofauna in the large lowland Warta River, Poland
The Warta River is a tributary of the Odra (Oder) River.It is 795.2 km long.In 1986 the large Jeziorsko dam reservoir was constructed in the 306th km of its course.In the late 1980s, the river pollution assumed its highest level and stopped increasing as the former political system collapsed and many industrial plants went bankrupt.Unified fish ele