Science takes on invasive algae threatening the Azorean coast

The Azores now have a multidisciplinary study focused on Rugulopteryx okamurae, an invasive macroalgae whose spread has been placing increasing pressure on the archipelago’s coastal ecosystems. The work, developed by the University of the Azores in partnership with the Regional Directorate for Maritime Policies, was presented in Horta on 23 July.

The species was first detected in the Region in 2019, and its rapid expansion has made it one of the islands’ most significant marine bioinvasion challenges. Large accumulations of biomass and the occupation of rocky seabeds can degrade coastal habitats and affect the condition of bathing areas.

The research is structured around three areas: understanding the algae’s biology, ecology and dispersal; assessing possible uses for the biomass; and identifying mitigation measures. Options under study include biotechnological applications, ruminant feed and agricultural composting, alongside the need to reduce environmental impacts.

The study also considers removal techniques, the management of major coastal strandings and the creation of response protocols. Its discussion brought together researchers, public administration, maritime authorities, municipalities and civil society, reflecting the need for coordination among those who monitor, manage and use the coast.

For the Azores, this is more than a conservation issue. Healthy coastal ecosystems support local fisheries, leisure and the islands’ tourism appeal, so turning scientific knowledge into practical measures will be key to limiting the effects of this invasion on communities and coastal areas.