The ongoing international effort to protect the Sargasso Sea ecosystem in the NW Atlantic is hampered by limited scientific research on Sargassum - the floating algae common to the North Atlantic gyre. This project aims to provide the first simultaneous examination of Sargassum macrofauna diversity across multiple regions, in order to better understand the impacts of oceanographic variables on Sargassum distribution and to contribute to the international effort to protect the Sargasso Sea.