A sublittoral transect (P3) in the North of Helgoland that had been investigated ~40 years earlier by Lüning (1970) was traversed again. Scuba dives were carried out between 13.07.2005 and 25.08.2005. For each sampling point, time, date and coordinates were given as well as the depth in m mean low water spring tide. 0.25 m² frames were used to obtain the species composition, total fresh mass and total dry mass. In addition, 1 m² frames were used to record the kelp community by counting the individuals and measuring kelp stipe length, kelp blade area, kelp blade fresh mass, kelp age and fresh mass of epiphytes on the kelp stipes. Equal Location IDs represent the same frame.

Gehling (2006) figure 3 shows the sampling location as green lines. The Loc ID is the frame no. In frame 1, 10 species were found and weight was taken. In frame 4, 13 species were found. Weight was taken from all species and in addition, stipe and blade weight of L. hyperborea was measured as well as single weights from each individual called Individual code: 1-18, as there where 18 L. hyperborea.