Earlier this month, a fascinating paper was published in Science about the genetic origins of Southeast Asian populations. Analysis of genomes from 25 ancient samples reveal that rather the neither of the existing theories (hunter-gathering Hoabinhians, or agriculturalists from China) are correct, and that there are four ancient populations the form the basis of all modern Southeast Asian populations today.
The prehistoric peopling of Southeast Asia
McColl et al.
Science 06 Jul 2018:
Vol. 361, Issue 6397, pp. 88-92
The human occupation history of Southeast Asia (SEA) remains heavily debated. Current evidence suggests that SEA was occupied by Hòabìnhian hunter-gatherers until ~4000 years ago, when farming economies developed and expanded, restricting foraging groups to remote habitats. Some argue that agricultural development was indigenous; others favor the “two layer” hypothesis that posits a southward expansion of farmers giving rise to present-day Southeast Asian genetic diversity. By sequencing 26 ancient human genomes (25 from SEA, 1 Japanese Jōmon), we show that neither interpretation fits the complexity of Southeast Asian history: Both Hòabìnhian hunter-gatherers and East Asian farmers contributed to current Southeast Asian diversity, with further migrations affecting island SEA and Vietnam. Our results help resolve one of the long-standing controversies in Southeast Asian prehistory.
21 September 2007 (Science Magazine) – And finally, the abstract of the homo floresiensis wrist study from Science Magazine. Subscription required for full access.
The Primitive Wrist of Homo floresiensis and Its Implications for Hominin Evolution
Matthew W. Tocheri, Caley M. Orr, Susan G. Larson, Thomas Sutikna, Jatmiko, E. Wahyu Saptomo, Rokus Awe Due, Tony Djubiantono, Michael J. Morwood, William L. Jungers
Whether the Late Pleistocene hominin fossils from Flores, Indonesia, represent a new species, Homo floresiensis, or pathological modern humans has been debated. Analysis of three wrist bones from the holotype specimen (LB1) shows that it retains wrist morphology that is primitive for the African ape-human clade. In contrast, Neandertals and modern humans share derived wrist morphology that forms during embryogenesis, which diminishes the probability that pathology could result in the normal primitive state. This evidence indicates that LB1 is not a modern human with an undiagnosed pathology or growth defect; rather, it represents a species descended from a hominin ancestor that branched off before the origin of the clade that includes modern humans, Neandertals, and their last common ancestor.
21 September 2007 (ABC News in Science) – The proof is all in the wrist! Dr Matthew Tocheri, the lead researcher in the Hobbit wrist study explains why the wrist is the most compelling proof that our Flores hobbit is really a new species. But will this be the last we hear of the issue? I doubt it.
Hobbit evidence will silence critics, scientist says
Scientists say they have proof the so-called ‘hobbit’ from the Indonesian island of Flores is a new species, adding that the evidentiary smoking gun is all in the wrist.
The Smithsonian Institution’s Dr Matthew Tocheri, based in Washington, is the lead author of the paper published in the journal Science.
21 September 2007 (ABC News in Science) – Here’s a news piece about the wrist study which sums up the news quite nicely in layman terms. There’s also a dissenting opinion about the study that’s also food for thought.
Wrist gives hobbit theory the flick
The hobbit had wrists more like those of non-human apes than those of modern humans, according to researchers who say their findings are more evidence that Homo floresiensis is a new species.
20 September 2007 (Smithsonian Institution) – A new study on the wrist bones recovered from the homo floresiensis assembly adds extra weight to our Hobbit from Flores being an entirely new species rather than a sick, deformed human. There are a few other stories popping up today so stay tuned for more insights! It’s a really busy day at work, so hopefully I can post them all up by the end of the day.
Homo Floresiensis skull, creative commons image by SBishop
New Research Sheds Light on “Hobbit” Smithsonian-led Study Published in Science
An international team of researchers led by the Smithsonian Institution has completed a new study on Homo floresiensis, commonly referred to as the “hobbit,” a 3-foot-tall, 18,000-year-old hominin skeleton, discovered four years ago on the Indonesian island of Flores. This study offers one of the most striking confirmations of the original interpretation of the hobbit as an island remnant of one of the oldest human migrations to Asia. The research is being published in the Sept. 21 issue of Science.