As every pub quizmaster knows, the world’s largest desert is not the Sahara. It is Antarctica. The polar continent gets almost no rain—and is home to a host of unique and hardy creatures, whose ancestors survived several ice ages. Visitors from warmer locations, including small animals like earthworms and mites, have been known to hitch rides on great rafts of kelp. But research published in Global Change Biology
shows that invasive species may also hitch rides on another vessel: plastic debris, By modelling the drift of millions of virtual particles, scientists found that objects can float to Antarctica from South America, South Africa, Australia and New Zealand—not just (relatively) nearby sub-Antarctic islands, as was previously thought. Beyond trashing the pristine landscape, the invaders could threaten Antarctica’s ecosystem. Harsh conditions have hitherto stymied the growth of invasive colonies. However, warming waters, as a result of climate change, could aid the arrival—and survival—of newcomers.
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