Oxygen Hotspot

The Equatorial Pacific looks poor in life, with warm, clear waters. But winds and deep currents sometimes push up cool, nutrient-rich water. This upwelling sparks plankton blooms that feed surprising food webs. Even this “ocean desert” hides bursts of life.

The North Atlantic Gyre is a huge swirl of clear, nutrient-poor water. It is often called an “ocean desert,” with little food or biodiversity. Still, drifting animals like jellyfish and tuna travel its currents. It also helps move heat around the planet. The North Atlantic subtropical gyre is the most iconic and historically stable area where Sargassum naturally accumulates, forming the Sargasso Sea ecosystem.

The Indian Ocean Gyre covers wide areas of poor, clear water. It looks empty, with few nutrients and little food. Yet it supports plankton and migrating fish like tuna. It is also a place where floating plastics collect.