News Finding: Constant contact with Asian populations continued until around 25,000 years ago, when the gene flow between the two groups ceased.
Paper Finding: Our findings further suggest that the far-northern North American presence of northern Native Americans is from a back migration that replaced or absorbed the initial founding population of Ancient Beringians.
News Context: According to the team's timeline, the ancestral population first emerged as a separate group around 36,000 years ago, probably somewhere in northeast Asia. Constant contact with Asian populations continued until around 25,000 years ago, when the gene flow between the two groups ceased. This cessation was probably caused by brutal changes in the climate, which isolated the Native American ancestors.
Paper Context: , and that Native American gene flow into Inuits was through northern and not southern Native American groups . Our findings further suggest that the far-northern North American presence of northern Native Americans is from a back migration that replaced or absorbed the initial founding population of Ancient Beringians. Humans were present in the Americas south of the continental ice sheets by around .6 ka , indicating that they traversed Beringia earlier.