A Checklist of Macroalgae from Unskaya Inlet, White Sea

This paper presents the results of a study of the macroalgal flora in Unskaya Inlet (White Sea) that was carried out in 2022–2023. The checklist of macrophytes, summarized from original and literature data, comprises 94 species: Chlorophyta, 26; Rhodophyta, 34; Phaeophyceae, 30; Xanthophyceae, 2; Charophyceae, 1; and Cyanophyta, 1. Of these, 46 species are new to the region, 4 are new to the White Sea, and 2 are new to the flora of Russia. From the offshore part to the head of Unskaya Inlet, the coastal surface runoff leads to significant freshening and increased turbidity of water, thus causing a sharp depletion of the species composition of algae.