I was reading Ehret's latest book "Ancient Africa: a global history, to 300 CE". In chapter 6 he mentioned there's evidence of the Austronesian ancestors of the Malagasy stopping over on the east African coast before reaching Madagascar. At that point they introduced the chicken, banana, and xylophone to sub-Saharan Africa.
As Ehret mentioned above its been postulated there could've been multiple Austronesian migratory waves to East Africa/Madagascar in addition to the direct Indonesia-Madagascar migration, one of which suggests a northerly wave that followed the monsoon route from India to the Somali coast.
There's evidence of an Austronesian mtDNA lineage contributing to the Somali gene pool
One main problem is we can't deduce whether B4a1a1b* is a recent Benadiri/Bajuni/Swahili maternal lineage (they're culturally linked to northern Madagascar and Comoros) or an old deeply rooted ethnic Somali lineage, as most of those Malagasy maternal samples in the picture above are oddly basal instead of forming medieval subclades (maybe that changes going forward).
Interestingly the Malagasy population was founded by a very small a group of people, only 30 women
www.ncbi.nlm.nih.gov
Those of you who are on 23andme might have also noticed some Somalis get trace 0.1-0.2% Broadly Melanesian. Is it all noise?


As Ehret mentioned above its been postulated there could've been multiple Austronesian migratory waves to East Africa/Madagascar in addition to the direct Indonesia-Madagascar migration, one of which suggests a northerly wave that followed the monsoon route from India to the Somali coast.

There's evidence of an Austronesian mtDNA lineage contributing to the Somali gene pool

One main problem is we can't deduce whether B4a1a1b* is a recent Benadiri/Bajuni/Swahili maternal lineage (they're culturally linked to northern Madagascar and Comoros) or an old deeply rooted ethnic Somali lineage, as most of those Malagasy maternal samples in the picture above are oddly basal instead of forming medieval subclades (maybe that changes going forward).
Interestingly the Malagasy population was founded by a very small a group of people, only 30 women
A small cohort of Island Southeast Asian women founded Madagascar - PMC
The settlement of Madagascar is one of the most unusual, and least understood, episodes in human prehistory. Madagascar was one of the last landmasses to be reached by people, and despite the island's location just off the east coast of Africa, ...

Those of you who are on 23andme might have also noticed some Somalis get trace 0.1-0.2% Broadly Melanesian. Is it all noise?
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