In 2015 a new exotic seaweed with invasive behaviour was detected at the Strait of Gibraltar (western Mediterranean), which was morphological and genetically identified as Rugulopteryx okamurae. Due to its rapid expansion and remarkable ecological, economic, and social impacts, the species was included in the Spanish Checklist of exotic invasive species. However, distribution models of the species identified other European coasts as favourable for this new invader. In this presentation we provide scientific arguments for the inclusion of R. okamurae in the list of invasive species of European Union concern, becoming the first seaweed species to be included in that list.
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