A post that I wrote in July 2014 regarding the Loss of Amerindian genetic diversity post 1492, has now more evidence to support it, as shown by a paper by Bastien Llama et al., Ancient mitochondrial DNA provides high-resolution time scale of the peopling of the Americas Science Advances 01 Apr 2016:Vol. 2, no. 4, e1501385, DOI: 10.1126/sciadv.1501385.
The paper states that "As a result, our ancient mitochondrial data suggest that European colonization was followed by local mass mortality and extinction of lineages associated with major population centers of the pre-Columbian past. Our results contrast with previous observations that Native American genetic diversity has been temporally and geographically stable for at least the past 2000 years".
And has some interesting graphs showing the loss of lineages.
I disagree with the timeline and the Beringian standstill notion, but I must admit it is an interesting paper.
The following image, from the paper, shows the magnitude of this loss of diversity, but the magnitude is surely bigger as the sampling of archaic genomes is quite small: the paper only includes one (1) sample from the US and Canada, one from Northern Mexico (none from Yucatan or Central America, Venezuela, Guyanas, Colombia, Ecuador,Brazil, Southern Chile, Paraguay or Uruguay, and only 2 from Argentina, excluding Patagonia... (see Fig. S1 in the paper)
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