Researchers have long wondered how iguanas got to Fiji, a collection of remote islands in the South Pacific. They thought maybe they'd scurried there through Asia or Australia before volcanic activity pushed Fiji far away. But new research published Monday in the journal Proceedings of the National Academy of Sciences suggests that millions of years ago, iguanas pulled off a 5,000-mile odyssey on a raft of floating vegetation—masses of uprooted trees and small plants. That journey is thought to be a record, further than any other land-dwelling vertebrate has ever traveled on the ocean, per the AP. Scientists think that's how iguanas got to the Galapagos Islands off of Ecuador and between islands in the Caribbean.
Initially the researchers thought Fiji might be a bit too far for such a trip, but in a new study, they inspected the genes of 14 iguana species spanning the Americas, the Caribbean, and Fiji. They discovered that Fijian iguanas were most closely related to desert iguanas from North America, and that the two groups split off around 31 million years ago. The researchers created a statistical model using that information and other tidbits about where iguanas live today and how they may spread. It suggested that the iguanas most likely floated to Fiji from North America. "Given what we know now, their result is by far the most strongly supported," said Kevin de Queiroz, an evolutionary biologist at the Smithsonian National Museum of Natural History who wasn't involved with the new study.
The journey from North America to Fiji could have taken a few months, but these desert iguanas would've been ideal passengers because they were adept at resisting dehydration and could have snacked on the plants underfoot. "If you had to pick a vertebrate to survive a long trip on a raft across an ocean, iguanas would be the one," said study author Simon Scarpetta from the University of San Francisco. Many Fijian iguana species are endangered, and an invasive green iguana roams the islands today, said study author Robert Fisher of the United States Geological Survey. Figuring out where these creatures came from can equip scientists with the tools to better protect them in the future.
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