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>This is the neuston, a whole ecosystem living at the ocean’s surface. I once stumbled upon a raft of neuston when a storm blew it ashore in California. Many neustonic animals are vibrant highlighter colors, and the sand was saturated in bright blues and pale pinks. Together, these small creatures may function like upside-down coral reefs: an oasis of shelter and life far out to sea. As far back as the Cold War era, scientists were describing these colorful and important ecosystems, yet they still remain all but unknown. But now, as efforts to clean the ocean of plastic start up, our ignorance is putting this ecosystem at risk.
The neuston is home to more than blue buttons and bright snails. Erupting through the lawn of blue are crackling purple, red, gold, and yellow strands. These are Portuguese man o’ wars, whose tentacles stretch like lightning from the meadows of blue and pink. And among them, dragons roam.
Small nudibranchs, known as blue sea dragons, feast on blue buttons and man o’ wars, using their winglike cerata to grab and hold onto their tentacled prey. There are sea anemones, barnacles, copepods, color-changing crabs, specialized bacteria, even bugs, all living in this inverted reef in the middle of the open ocean. (Organisms that live exclusively by floating at the surface of the water are called pleuston, while neuston is a broader term, referring generally to the sea-surface ecosystem, which is why I chose to use it here.)