Fig. 4

Relationships between biomass of mussels Mytilus edulis assessed annually on Balgzand (in g AFDM m⁻², means of March and August data at 15 sampling stations) and mussel biomass recorded in two other Wadden Sea areas: a means of two mussel beds in Königshafen in 13 years between 1984 and 2005, in kg AFDM m⁻² (from Fig. 2a of Büttger et al. 2008), b total mussel biomass in an extensive area in the northern German Wadden Sea (Schleswig-Holstein) in 13 years between 1988 and 2004, in 10⁶ kg wet weight (from Fig. 2b of Nehls et al. 2006)