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This marshy environment may have been particularly welcoming for some species such as birds, but there were also spots where there was evidence of larger mammals making the migration. One site hosted mammoth DNA. Bison are also known to have crossed from Eurasia to North America during the time that the land bridge existed, and horses are known to have made it from North America to Eurasia.
“Even if it was mostly floodplains and ponds, the grazers were around, just uphill following higher, drier areas,” Fowell said.
However, the environment may have been less conducive for species that did not make the move between continents, such as the woolly rhino (a Eurasian native), American camel (native to north and central America), and the short-faced bear (native to North America).
“The watery, wet landscape could have been a barrier for some species,” Jenna Hill, a geologist with the U.S. Geological Survey who is also presenting research on the Bering Sea core data at the AGU meeting, said in the statement, “or a pathway for species that actually travel by water.” Further research will be needed to understand the full impact of the environment on migration.
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Publish date : 2024-12-10 02:53:00
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