Records of the brown alga Halosiphon tomentosus (Lyngbye) Jaasund (Phaeophyceae) in the South-Eastern Baltic Sea
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Abstract
For the first time, Halosiphon tomentosus (Lyngb.) Jaasund (Chorda tomentosa Lyngb.) was recorded in the South-Eastern Baltic Sea in May–June 2016, in several locations of the Sambia Peninsula northern coast. The species was found in the upper horizon of sublittoral on boulders in assemblages with green and brown algae (Ulva intestinalis, Ulva prolifera, Cladophora glomerata, Ectocarpus siliculosus, Pylaiella littoralis, and sometimes Pseudolithoderma subextensum and Hildenbrandia rubra). The species was recorded in 2017–2018 as well. The length of thread-like thalli ranged 3–30 cm, with the mean value of (9.2 ± 2.3) cm. The mean biomass was of (73.3 ± 41.9) g·m−2 in 2016 and (11 ± 8.8) g·m−2 in 2018. The reasons for H. tomentosus occurrence in the South-Eastern Baltic and its absence in the adjacent sea areas require further research.
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References
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