Oceania into four racial groups: Malayans, Polynesians, Micronesians, and Melanesians. D'Urville's model differed from that of Bory de Saint-Vincent in referring to 'Melanesians' rather than 'Mélaniens.' He derived the name Melanesia from Greek , black, and , island, to mean "islands of black people". Bory de Saint-Vincent had distinguished Mélaniens from the indigenous Australians. Dumont D'Urville combined the two peoples into one group. Soares et al. (2008) have argued for an older pre-Holocene Sundaland origin in Island Southeast Asia (ISEA) based on mitochondrial DNA. The "out of Taiwan model" was challenged by a study from Leeds University and published in Molecular Biology and Evolution. Examination of mitochondrial DNA lineages shows that they have been evolving in ISEA for longer than previously believed. Ancestors of the Polynesians arrived in the Bismarck Archipelago of Papua New Guinea at least 6,000 to 8,000 years ago. Paternal Y chromosome analysis by Kayser et al. (2000) also showed that Polynesians have significant Melanesian genetic admixture. A follow-up study by Kayser et al. (2008) discovered that only 21% of the Polynesian autosomal gene pool is of Melanesian origin, with the rest (79%) being of East Asian origin. A study by Friedlaender et al. (2008) confirmed that Polynesians are closer genetically to Micronesians, Taiwanese Aborigines, and East Asians, than to Melanesians. The study concluded that Polynesians moved through Melanesia fairly rapidly, allowing only limited admixture between Austronesians and Melanesians. Thus, the high frequencies of B4a1a1 are the result of drift and represent the descendants of a very few successful East Asian females. Austronesian languages and cultural traits Austronesian languages and cultural traits were introduced along the north and south-east coasts of New Guinea and in some of the islands north and east of New Guinea by migrating Austronesians, probably starting over 3,500 years ago. This was followed by long periods of interaction that resulted in many complex changes in genetics, languages, and culture. It was once postulated that from this area a very small group of people (speaking an Austronesian language) departed to the east and became the forebears of the Polynesian people. This theory was, however, contradicted by a study published by Temple University finding that Polynesians and Micronesians have little genetic relation to Melanesians; instead, they found significant distinctions between groups living within the Melanesian islands. Genetic links have been identified between the Oceanic peoples. Polynesians are dominated by a type of macro-haplogroup C y-DNA,