Publication Date:
2023-05-12
Description:
We surveyed macroalgae at Hansneset, Blomstrand 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 〉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.
Keywords:
Acrosiphonia spp., biomass, wet mass; Alaria esculenta, biomass, wet mass; Callophyllis cristata, biomass, wet mass; Chorda filum, biomass, wet mass; Chordaria flagelliformis, biomass, wet mass; DEPTH, water; Desmarestia aculeata, biomass, wet mass; Desmarestia viridis, biomass, wet mass; Devaleraea ramentacea, biomass, wet mass; Dictyosiphon foeniculaceus, biomass, wet mass; DIVER; Fucus distichus, biomass, wet mass; Hansneset; Haplospora globosa, biomass, wet mass; Kongsfjorden, Spitsbergen, Arctic; Laminaria digitata, biomass, wet mass; Laminaria saccharina, biomass, wet mass; Laminaria solidungula, biomass, wet mass; Laminaria spp., young, biomass, wet mass; Odonthalia dentata, biomass, wet mass; Phycodrys rubens, biomass, wet mass; Ptilota gunneri, biomass, wet mass; Pylaiella littoralis, biomass, wet mass; Quantitative frame sampling; Replicate; Saccorhiza dermatodea, biomass, wet mass; Sampling by diver
Type:
Dataset
Format:
text/tab-separated-values, 440 data points
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