the Biological Institute Helgoland (Biologische Anstalt Helgoland / BAH), which joined the Alfred Wegener Institute in 1998. Generations of scientists have conducted research on the ecology of coastal and [...] standing in the area of European oceanographic research. To mark this milestone anniversary, the Alfred Wegener Institute’s BAH will be hosting an open house: on 19 May (on Helgoland) and 20 May (on Sylt), visitors