Sweet potatoes reveal ancient contact between Polynesians and South Americans

Published on January 31st, 2013 | by Admin


By conducting genetic research on modern sweet potatoes with on ones preserved by the first European explorers in Polynesia, archaeologists have revealed that thousands of years ago Polynesian sailors must have come into contact with South Americans as the root vegetable was first domesticated in Peru.

Humans domesticated the sweet potato in the Peruvian highlands about 8000 years ago, and previous generations of scholars believed that Spanish and Portuguese explorers introduced the crop to Southeast Asia and the Pacific beginning in the 16th century. But in recent years, archaeologists and linguists have accumulated evidence supporting another hypothesis: Premodern Polynesian sailors navigated their sophisticated ships all the way to the west coast of South America and brought the sweet potato back home with them. The oldest carbonized sample of the crop found by archaeologists in the Pacific dates to about 1000 C.E.—nearly 500 years before Columbus’s first voyage. What’s more, the word for “sweet potato” in many Polynesian languages closely resembles the Quechua word for the plant.

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Story: Lizzie Wade, Science | Photo: iStockphoto/Thinkstock

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