A Pacific invasive alga (*Rugulopteryx okamurae*) has now colonized three sites…

A Pacific invasive alga (Rugulopteryx okamurae) has now colonized three sites along this coast, from Hondarribia to Guéthary, with the northernmost record appearing just last summer. The species first arrived in Europe in 2002 and has been expanding steadily southward; its presen