Abstract

The invasive brown alga Sargassum muticum was first observed growing attached in Norway in 1988. Since then, the species has spread rapidly and is now an established member of the algal community in sheltered areas along the entire Skagerrak coast. In 1999, one population in the outer Oslofjord was investigated for epiphytic macroalgae, and evidence was found of a rich macroalgal community on S. muticum. A total of 82 different algal taxa were identified: 34 rhodophytes, 23 phaeophytes and 25 chlorophytes. The epiphytes found on S. muticum included more than 25% of the total number of algal species found in the Oslofjord area. A summary of all species recorded is given, with floristic notes on particular taxa.

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