Roscoe Stanyon*, Marco Sazzini and Donata Luiselli
Corresponding author: Roscoe Stanyon email@example.com
Journal of Biology 2009, 8:18 doi:10.1186/jbiol115
(2009-02-16 16:23) University of Florence and Bologna
Due to space limitations we did not discuss completely the evidence for the hypothesis
that Tibetan settlement could well be earlier than that of Japan. We noted that the
genetic diversity is much higher, usually considered indicative of earlier settlement,
and that the coalescence time of the Tibetan Y chromosome sublineage is older than
that of Japan (52,000 vs 37,000). We can add here that Shi et al also noted that the
both the Tibetan and Japanese sub-haplogroups have a short-distanced, star-like network
structure, typical of founding lineages. Further, the earliest material evidence for
modern humans in Japan is at 30,000 year ago while recent archeological data shows
modern human presence in Northern Tibet is as least as old if not older (30 to 40,000
year ago). All these data are consistent with an ancient settlement date for Tibet.
We cannot judge the detail and the accuracy of the Wikipedia entry, but it is clear
that at least some parts of Tibet were apparently hospitable for humans earlier than
previously thought. Finally, current research deals mostly with questions of the when
and where of modern human migration. The questions of why raised in this comment are
not only more challenging, but also more rewarding and certainly will eventually be
the subject of future research. R. Stanyon, M. Sazzini & D. Luiselli
(2009-02-16 15:51) ATSDR
Per http://en.wikipedia.org/wiki/W%C3%BCrm_glaciation and the figure "Vegetation types
at the last glacial maximum", at roughly the time of the suggested in migration to
Tibet, the vegetation was "polar and alpine desert" (if I can correlate the colors
correctly). What would push a population (thought to be small?) to such a climate
when other areas of southeast Asia have vegetation types that seem to be much more
suitable for human occupation?
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