Surprising new evidence which overturns current theories of how humans colonised the Pacific has been discovered by scientists at the University of Leeds.
But the Leeds research - published today in The American Journal of Human Genetics - has found that the link to Taiwan does not stand up to scrutiny. In fact, the DNA of current Polynesians can be traced back to migrants from the Asian mainland who had already settled in islands close to New Guinea some 6-8,000 years ago.
The type of DNA extracted and analysed in this kind of study is that stored in the cell's mitochondria. Mitochondrial DNA (mtDNA) is passed down the maternal line, providing a record of inheritance which goes back thousands of years. The scientists look for genetic signatures which enable them to classify the DNA into different lineages and then use a 'molecular clock' to date when these lineages moved into different parts of the world.
Lead researcher, Professor Martin Richards, explains: "Most previous studies looked at a small piece of mtDNA, but for this research we studied 157 complete mitochondrial genomes in addition to smaller samples from over 4,750 people from across Southeast Asia and Polynesia. We also reworked our dating techniques to significantly reduce the margin of error. This means we can be confident that the Polynesian population - at least on the female side - came from people who arrived in the Bismarck Archipelago of Papua New Guinea thousands of years before the supposed migration from Taiwan took place."
Nevertheless, most linguists maintain that the Polynesian languages are part of the Austronesian language family which originates in Taiwan. And most archaeologists see evidence for a Southeast Asian influence on the appearance of the Lapita culture in the Bismarck Archipelago around 3,500 years ago. Characterised by distinctive dentate stamped ceramics and obsidian tools, Lapita is also a marker for the earliest settlers of Polynesia.
Professor Richards and co-researcher Dr Pedro Soares (now at the University of Porto), argue that the linguistic and cultural connections are due to smaller migratory movements from Taiwan that did not leave any substantial genetic impact on the pre-existing population.
"Although our results throw out the likelihood of any maternal ancestry in Taiwan for the Polynesians, they don't preclude the possibility of a Taiwanese linguistic or cultural influence on the Bismarck Archipelago at that time," explains Professor Richards. "In fact, some minor mitochondrial lineages back up this idea. It seems likely there was a 'voyaging corridor' between the islands of Southeast Asia and the Bismarck Archipelago carrying maritime traders who brought their language and artefacts and perhaps helped to create the impetus for the migration into the Pacific.
"Our study of the mtDNA evidence shows the interactions between the islands of Southeast Asia and the Pacific was far more complex than previous accounts tended to suggest and it paves the way for new theories of the spread of Austronesian languages."
The study, which involved researchers from the UK, Taiwan and Australia, was mainly funded by the British Academy, the Bradshaw Foundation and the European Union.
Professor Richards is available for interview. Please contact:
Jo Kelly, Campus PR Ltd: Tel 0113 258 9880, Mob 07980 267756, email email@example.com
Notes to editors:
Professor Richards' main collaborator on this research was Dr Pedro Soares, formerly of the University of Leeds and now at the Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP).