Sargassum is brown algae that washes up on the beach. New research shows that it is also a complex sea community and source of biodiversity in the Sargasso Sea.
The lines and clumps of sargassum (reddish brown grass floating at sea that forms the foundation of a complex sea community) can stretch for miles along the ocean’s surface here in the North Atlantic. Get high above the surface and you’ll find the orange and brown seaweed as far as the eye can see. And you can’t see it all, because the area known as the Sargasso Sea stretches for almost 2 million square miles.