Keywords: Acinetospora crinita, cover; Ahnfeltia plicata, cover; Area/locality; Blidingia chadefaudii, cover; Blidingia minima, cover; Blidingia sp., cover; Blue-green algae, cover; Cancer pagurus; Carcinus maenas; Ceramium deslongchampsii, cover; Ceramium virgatum, cover; Chaetomorpha melagonium, cover; Chondrus crispus, cover; Chondrus substrate; Cladophora rupestris, cover; Cladophora sericea, cover; Cladostephus spongiosus, cover; Coccotylus truncatus, cover; Corallina officinalis, cover; Counting; Crassostrea gigas; Crustose corralines, cover; Cystoclonium purpureum, cover; DATE/TIME; Dumontia contorta, cover; Dynamena pumila, cover; Elminius modestus, cover; Erythrotrichia carnea, cover; Estimated; Flustrella hispida; Fucus serratus, cover; Fucus serratus, juvenile, cover; Fucus spiralis, cover; Fucus vesiculosus, cover; Gauss-Krueger Hochwert; Gauss-Krueger Rechtswert; Gauss-Krueger Streifen; German Bight, North Sea; Gibbula cineraria; Habitat; HAND; Helgoland; Helgoland_SES; Hincksia granulosa, cover; Idotea granulosa; Laminaria digitata, cover; Laminaria digitata, juvenile, cover; Lanice conchilega; LATITUDE; Leptochaete cinearia, cover; Leucosolenia botryoides, cover; Littorina littorea; Littorina littorea, cover; Littorina obtusata; Littorina saxatilis; LONGITUDE; LTER_Benthos; Macrobenthic long-term series in the German Bight; Mastocarpus stellatus, cover; Mastocarpus substrate; Meeresstation Helgoland; Membranoptera alata, cover; Mytilus edulis; Mytilus edulis, cover; Nucella lapillus; Pilayella littoralis, cover; Plocamium cartilagineum, cover; Plumaria elegans, cover; Polysiphonia fucoides, cover; Porphyra umbilicalis, cover; Prasiola calophylla, cover; Prasiola furfuracea, cover; Prasiola sp., cover; Prasiola stipitata, cover; Rhizoclonium tortuosum/Chaetomorpha ligustica complex, cover; Rhodochorton purpureum, cover; Rhodomela confervoides, cover; Rhodothamniella floridula, cover; Sample position; Sampling by hand; Sargassum muticum, cover; Scytosiphon lomentaria, cover; Sphacelaria rigidula, cover; Spongomorpha aeruginosa, cover; Substratum; Topography; Ulva lactuca, cover; Ulva lactuca, juvenile, cover; Ulva linza, cover; Ulva sp., cover; Urospora sp., cover