Fig. 9A, BFrom: 40-year long-term study of microbial parameters near Helgoland (German Bight, North Sea): historical view and future perspectives Box and whisker plots of MPN (most probable number) values indicating oil-degrading bacteria from 1980 to 1993. Displayed are yearly (A) and monthly (B) combined data of samples from the neuston (open boxes) and from 1-m depth (grey boxes) Back to article page