PDA

View Full Version : The totally isolated tribes of the Andaman



Tomenable
14-04-16, 21:56
A very interesting documentary about Andaman Islanders:


https://www.youtube.com/watch?v=p6I6L8b6mQs

ThirdTerm
15-04-16, 03:49
The Onge people exclusively belong to mtDNA haplogroup M and Y-DNA Haplogroup D, which is quite similar to the Tibetans and the Ainu in East Asia, but Malaysian Negrito subgroups are genetically distant from East Asian populations. The Malaysian Negritos are much closer to the Onge of the Andaman Islanders and a recent study by Aghakhanian et al. (2015) found significant gene flow between Andamanese and Malaysian Negritos. There’s also substantial Austro-Asiatic admixture in these Malaysian Negrito subgroups and the Onge and Jarawa appeared closest to Papuans and Melanesians from PCA results.

http://gbe.oxfordjournals.org/content/7/5/1206/F2.medium.gif



The computed D statistics demonstrated significant gene flow between Andamanese and Malaysian Negritos but there was no significant gene flow detected between Andamanese and other OA groups. This suggests that an earlier gene flow occurred before other OA groups arrived in Peninsular Malaysia. The D statistics supported admixture between different OA groups, as gene flows between Negrito/Senoi, Negrito/ Proto-Malays, and Senoi/Proto-Malays were evident. We also traced admixture in AA-speaking OAs and those of Mainland SEA and Lahu and Dai, ethnic groups from South China. Malaysia Negrito subgroups were clearly different from EA populations. This distinct pattern may have resulted from genetic drift. It is also conceivable that they had longer periods of isolation from other inhabitants in the region, as indicated by Fst and LD decay. The ancestral component (dark green) “belonging” to Malaysian Negritos was also spread among Southeast Asian and Southern Chinese populations. However, although Negritos predominantly shared this ancestral component, the Mendriq shared more portions of other ancestral components with East Asians and Senoi. This suggests more recent gene flow between them and their neighboring populations, most likely Malays. A similar observation was reported in Jehai, a Negrito subgroup using a less SNP (Jinam et al. 2013).

LeBrok
15-04-16, 07:35
Very interesting. Indian bureaucracy is the worst in the world, I suppose.
Adamaniese (Adam and Eves? lol) people have such big and round heads they remind me certain Chinese. If not such black skin. They said that their Y dna is Asian, not African, so their might be some relation.

bicicleur
15-04-16, 08:51
these haplogroup D people are allready more than 50.000 years in this area
they survived in small pockets in remote areas, others were replaced by C2 and C1b

Kisuan
20-05-16, 09:04
these haplogroup D people are allready more than 50.000 years in this area
they survived in small pockets in remote areas, others were replaced by C2 and C1b

One of the most perplexing mysteries is, I believe I heard, is the migration pattern of y-dna haplogroup D. It was originally believed it made a path going from India to Southeast Asia, going into Indonesia and splitting into a branch that went into Papua New Guinea and another branch moving upwards into Formosa and finally into Japan, straddling off the coast of mainland East Asia (hence little D in the Han Chinese and other ethnic groups). Some carriers went up into the Tibetan Plateau from India, hence we find D in the Tibetans. However, interestingly, we find no D amongst Papua New Guineans or other Austrauloid-like populations (interesting, since the Andamanese are racially close to the Negritos as ThirdTerm pointed out). Negritos, Papua New Guineans and Aborigines all predominately belong to C. Certainly we should find at least some D if it made a migration through these lands(even 1%), but it is totally absent (from all studies I've seen). On the other hand, we're able to find D in some mainland East Asians (even Koreans!) at very low frequencies (~1-2%). It seems D migration is much more complex than previously thought (isolated peaks of D in remote far off regions). At least with haplogroup C, geneticists are able to make at least a feasible linear path of how C migrated in Asia based on modern distributions. C is thought to have went through Southeast Asia before splitting with one branch going into Papua New Guinea and Australia and the other going up into Mongolia-Siberia straddling the coast of East Asia (so we don't have peaks in China). Whatever the case, it seems there was a massive genocide of at least males who bore D and the isolation of D groups for very long periods of time (hence Tibetans, Andamanese people, and the Ainu don't look like each other due to likely mingling and genetic flow with chiefly female neighbors). Albeit, it's quite obvious the Tibetans and Ainu interacted extensively with other ethnicities due to their language, culture and presence of other y-dna haplogroups. Interestingly, I hear the Ainu have a supposed "Austrauloid" cranial classification.

bicicleur
20-05-16, 10:17
it looks like D migrated from Arabia eastward to Sundaland, but then a second wave of C arrived and most D tribes went extinct except a few pockets
some D tribe moved further northward along the Chinese coast till the Yangzi delta, there the tribe split in 3 parts
1 part went upstream the Yangzi, the other 2 invented pottery some 25 ka, then 1 moved into Japan 20 ka, the Ainu people and the other stayed in the swamps south of the Yangzi where they started gathering wild rice to cook in their pots 14 ka

keep in mind the Chinese coastline was much further east then, we'll never know what realy happened along the Chinese coast 20 ka and before