EN
The Middle Vistula Valley, and especially its section crossing three nature reserves, Łachy Brzeskie, Wyspy Świderskie, and Wyspy Zawadowskie, is an important stopover and foraging sitefor non-passerine waterbirds during autumn migration. The presence of many bird species, in particular Charadriiformes, depends on the water level in the river channel, that is, on the available food supply on sandy islands, shoals and silt.