Pre-historic Wallacea: A melting pot of human genetic ancestries

To shed light on the details of this expansion and the resulting human interactions, an international team of researchers analyzed DNA from 16 ancient individuals from different islands in Wallacea, greatly increasing the amount of ancient genomic data representing this region. "We found striking differences between regions in Wallacea and surprisingly, the ancestry of ancient individuals from the southern islands cannot be simply explained by admixture between Austronesian- and Papuan-related groups," says Sandra Oliveira, one of the study's lead authors.

Early ancestry contribution from Mainland Southeast Asia

The team identified an additional ancestry contribution from Mainland Southeast Asia, closest to present-day Austroasiatic speakers, and proposed that admixture occurred first between the Mainland Southeast Asian and Papuan-related ancestry and that gene flow from Austronesian-related groups occurred only later. "That Mainland Southeast Asian component is a great mystery to me. I suspect that we might be looking at small groups, perhaps of early farmers, who travelled a long way, left no archaeological or linguistic traces along the way, but who increased their population sizes after arrival," says Peter Bellwood, an author of the study who has conducted archaeological work in Island Southeast Asia for decades.

While the identity of the people who spread this ancestry is still unclear, the discovery of the Mainland Southeast Asian ancestry and its possible antiquity in the southern Wallacean islands has major implications for the understanding of the Neolithic dispersals into Island Southeast Asia. "This finding is very important for the archaeologists in the region," adds Toetik Koesbardiati, an Indonesian anthropologist involved in the study. He adds, "We will certainly intensify our efforts to study this migration with other lines of evidence."

Multiple admixture events throughout Wallacea

This work also revealed a closer relationship between the Austronesian-related ancestry of ancient individuals from northern Wallacea and the Pacific, compared to those from southern Wallacea -- a pattern matched by linguistic evidence. Additionally, it shed light on the timing of the Asian-Papuan genetic admixture. "Previous studies based on present-day populations have reported widely different estimates, some of which preceeded the archaeological evidence for the Austronesian expansion, while others were much more recent. Since we now have ancient individuals from different time periods we can directly show that admixture occurred in multiple pulses or continuously since at least 3,000 years ago throughout Wallacea," explains Mark Stoneking, a senior author of the study. He adds, "Future studies on older genomes might extend this date even further."

Local hunter-gatherers' genetic ancestry was largely replaced

The team also searched for genetic similarities between the newly reported ancient Wallaceans and a previously published pre-Neolithic individual from Sulawesi, another island in Wallacea. "All Wallacean individuals sequenced in this study are more similar to present-day New Guinean groups than to the earlier local population, suggesting that these two regions were more closely connected in ancient times than previously imagined," says Cosimo Posth, another senior author of the study. He concludes, "These results also confirm that the genetic ancestry of Wallacean hunter-gatherers has been largely replaced."