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  • Postglacial viability and colonization in North America's ice-free corridor

    Author(s)
    Pedersen, Mikkel Winther
    Ruter, Anthony
    Schweger, Charles
    Friebe, Harvey
    Staff, Richard A.
    Kjeldsen, Kristian K.
    Mendoza, Marie L. Z.
    Beaudoin, Alwynne B.
    Zutter, Cynthia
    Larsen, Nicolaj K.
    Potter, Ben A.
    Nielsen, Rasmus
    Rainville, Rebecca A.
    Orlando, Ludovic
    Meltzer, David J.
    Kjaer, Kurt H.
    Willerslev, Eske
    Griffith University Author(s)
    Willerslev, Eske
    Year published
    2016
    Metadata
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    Abstract
    During the Last Glacial Maximum, continental ice sheets isolated Beringia (northeast Siberia and northwest North America) from unglaciated North America. By around 15 to 14 thousand calibrated radiocarbon years before present (cal. kyr bp), glacial retreat opened an approximately 1,500-km-long corridor between the ice sheets. It remains unclear when plants and animals colonized this corridor and it became biologically viable for human migration. We obtained radiocarbon dates, pollen, macrofossils and metagenomic DNA from lake sediment cores in a bottleneck portion of the corridor. We find evidence of steppe vegetation, bison ...
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    During the Last Glacial Maximum, continental ice sheets isolated Beringia (northeast Siberia and northwest North America) from unglaciated North America. By around 15 to 14 thousand calibrated radiocarbon years before present (cal. kyr bp), glacial retreat opened an approximately 1,500-km-long corridor between the ice sheets. It remains unclear when plants and animals colonized this corridor and it became biologically viable for human migration. We obtained radiocarbon dates, pollen, macrofossils and metagenomic DNA from lake sediment cores in a bottleneck portion of the corridor. We find evidence of steppe vegetation, bison and mammoth by approximately 12.6 cal. kyr bp, followed by open forest, with evidence of moose and elk at about 11.5 cal. kyr bp, and boreal forest approximately 10 cal. kyr bp. Our findings reveal that the first Americans, whether Clovis or earlier groups in unglaciated North America before 12.6 cal. kyr bp, are unlikely to have travelled by this route into the Americas. However, later groups may have used this north–south passageway.
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    Journal Title
    Nature
    Volume
    537
    Issue
    7618
    DOI
    https://doi.org/10.1038/nature19085
    Subject
    Population, Ecological and Evolutionary Genetics
    Publication URI
    http://hdl.handle.net/10072/172155
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