Sargassum change of sea currents due to climate change. Also, nutriments from agricultural fertilizers and wastewater from the cities that end up in the sea could also make the algae bloom. Sargassum Sargassum is a genus of brown (class Phaeophyceae) macroalgae (seaweed) in the order Fucales. Numerous species are distributed throughout the temperate and tropical oceans of the world, where they generally inhabit shallow water and coral reefs, and the genus is widely known for its planktonic (free-floating) species. Most species within the class Phaeophyceae are predominantly cold-water organisms that benefit from nutrients upwelling, but the genus "Sargassum" appears to be
Sargassum muticum Isle of Wight in 1973). Currently, the alga is widespreaded from Norway to Portugal along Atlantic's coasts. "Sargassum muticum" has a range stretching from Campbell river, British Columbia to Baja in California. In Europe it extends along the coasts of Great Britain, France, Scandinavia, Baltic Sea, Helgoland, Netherlands, Ireland, the Iberian Peninsula and into the Mediterranean from Italy and the Adriatic. It is recorded from Japan, China and Alaska. Recently, some specimens were found on Moroccan coasts. It illustrates its huge tolerance regarding to its environments. Herbarium specimens are now stored in the Ulster Museum (BEL catalogue numbers: F11241 -