PerspectiveOcean Science

Seaweed, seaweed everywhere

See allHide authors and affiliations

Science  05 Jul 2019:
Vol. 365, Issue 6448, pp. 27
DOI: 10.1126/science.aay0989

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Summary

Thanks to the gas vesicles that give the Sargassum genus its name, the open-ocean seaweed species S. natans and S. fluitans float freely in the ocean. On page 83 of this issue, Wang et al. (1) report that patches and lines of these seaweeds have grown and spread through the Caribbean and across the north equatorial Atlantic to the west coast of Africa and the Gulf of Guinea, forming what the authors call the great Atlantic Sargassum belt. Other species of Sargassum, such as S. muticum (2) and S. horneri (3), have also increased their range recently but are rooted and are probably being spread through shellfish shipments and ship ballast water. It is the freely floating species that are providing the major changes noted by Wang et al.