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Pleistocene North African genomes link Near Eastern and sub-Saharan African human pop
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[QUOTE]Originally posted by Djehuti: [QB] [QUOTE]Originally posted by Swenet: [qb] @Elmaestro I never really got to the point of digging up all the reports talking about Afalou 28, so I don't know how old he is, and I don't have any firm ideas about what his genetic affinities are. His body proportions may be a red herring since he is just one individual (i.e. he may be an outlier in his own population). If I had to make a guess, I would say that a degree of cold adaptation occurred locally in the Maghreb. It's not unthinkable, because the Sahara is cold at night and it can even freeze there. And Nazlet Khater has a brachial index of 76, which is roughly the same as modern Europeans. So, contrary to popular belief, a degree of cold adaptation is not unthinkable just outside of the tropics or even within it. So, if Afalou 28's cold adaptation is a real thing and not an anomaly, and if he is older than the European migration to the Maghreb at the end of the Pleistocene, then there is no reason that it couldn't have happened locally. In that case I would interpret Afalou 28 as primarily being a mixture of MSA and the earliest LSA populations, and with minimal relationship to the new population represented by E-M78. The latter population would have been more tropically adapted in my view. I can't prove this directly, of course, due to the lack of skeletal remains. But it is strongly implied in the fact that the arrival of new E-M35 carriers during the Natufian (who were obviously related to the E-M78 carriers from Taforalt) also led to more tropical body proportions in the Levant. In fact, the Afalou samples other than #28 are similar in degree of tropical adaptation as Holliday's el Wad Natufians, and both of these samples are roughly as dissimilar to their local predecessors in terms of bodyplan. So it's tempting to say that new arrivals carrying E-M35 caused an increase of tropical body proportions in both regions. In that case, Afalou 28's mixed pattern of physical relationships (cold adapted, but with cranio-facial features consistent with African ancestry) can interpreted as simply not being affected as much by the the presumably younger European and E-M78 arrivals. Any mixture with northern and eastern populations is more likely to have made Afalou 28 more tropically adapted, because he is seemingly more cold adapted than UP Europeans (ironically) and these E-M35 carriers. [/qb][/QUOTE]I myself have suspected the possibility of indigenous North Africans evolving cold adaptated traits locally. If such is the case then this definitely would explain the cold adapted features of Natufians and thus further support their African origins. By the way, are you aware that certain Australian aboriginal groups, specifically Tasmanians, have cold adapted traits as well? http://bit.ly/2HL1LeX [b]Edit: Link shortened[/b] [/QB][/QUOTE]
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