The Wadden Sea in the Netherlands proves to be important for these migratory birds. 90% of all Dutch grey plovers stay there.
From 1975-2005, grey plover numbers in the Netherlands doubled. After 2005, the rise is numbers was not so clear any more.
There are several threats to those waders. Estuaries in Britain are in danger. Oil and grass drilling in their northern Siberian nesting areas is a problem as well.
Cockles (important food for waders) near Rottum: here.