Abstract
A total of 104 taxa, belonging to 27 genera, were recorded from 36 moss samples collected in the Stromness Bay area. Cluster analysis revealed two groups of samples. Group 1 consisted of the Achnanthes incognita–Fragilaria germainii assemblage and the Eunotia paludosa var. paludosa assemblage. Group 2 included the Pinnularia borealis assemblage. The major ecological factor dividing the two groups appears to be the moisture content of the samples. Group 1 represents wetter conditions, and the second group is found on very dry mosses. The assemblages of group 1 were separated from each other by pH. The Achnanthes incognita–Fragilaria germainii assemblage occurs in wet mosses with a circumneutral pH. The Eunotia paludosa var. paludosa assemblage prefers bryophyte habitats with low pH values. The size of Pinnularia borealis drops significantly according to the dryness of the moss habitat.
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