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We surveyed macroalgae at Hansneset, Blomstrand (78°39′N, 11°57′E) in Kongsfjorden, Svalbard, down to 30 m depth between 1996 and 1998. In total, 62 species were identified: 16 Chlorophyta, 25 Phaeophyceae, and 21 Rhodophyta. The majority of species (53.5%) belonged to the Arctic cold-temperate group, followed in frequency by species distributed from the Arctic to the warm-temperate region (25.9%). Four endemic Arctic species ( Laminaria solidungula ,  Acrosiphonia flagellata ,  A. incurva , and  Urospora elongata ) were found. Two species ( Pogotrichum filiforme  and  Mikrosyphar polysiphoniae ) were new to Svalbard. Chlorophyta, Phaeophyceae, and Rhodophyta extended from the eulittoral zone down to 11, 21, and &gt;30 m depths with maximum biomasses at 1–5 m, 5–10 m, and 5–30 m depths, respectively. Annual and pseudoperennial species had highest biomasses in the upper 5 m, while perennials were distributed deeper. The highest biomass (8600 g m -2  wet weight) at 5 m depth comprised mainly  L. digitata ,  Saccorhiza dermatodea ,  Alaria esculenta , and  Saccharina latissima . The biogeographic composition of macroalgae at Hansneset was rather similar to that of northeastern Greenland, but different from that of northern Norway, which has a higher proportion of temperate species. Climate warming and ship traffic may extend some of the distribution ranges of macroalgae from mainland Norway to Svalbard.

Species composition, zonation, and biomass of marine benthic macroalgae in Kongsfjorden, Svalbard